Reka .NET SDK

C# SDK for the Reka AI platform, auto-generated from the Reka OpenAPI specification using AutoSDK.

Installation

dotnet add package tryAGI.Reka

Usage

Create a client

using Reka;

var client = new RekaClient("your-api-key");

Chat completion

var response = await client.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "What is the capital of France?",
        },
    ],
    MaxTokens = 256,
});

Console.WriteLine(response.Choices[0].Message.Content);

Streaming

using Microsoft.Extensions.AI;

IChatClient chatClient = new RekaClient("your-api-key");

await foreach (var update in chatClient.GetStreamingResponseAsync(
    [new ChatMessage(ChatRole.User, "Count from 1 to 10")],
    new ChatOptions { ModelId = "reka-flash" }))
{
    Console.Write(update.Text);
}

Microsoft.Extensions.AI (IChatClient)

The SDK implements IChatClient for seamless integration with the .NET AI ecosystem:

using Microsoft.Extensions.AI;

IChatClient chatClient = new RekaClient("your-api-key");

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Hello!")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    });

Console.WriteLine(response.Text);

Tool calling

using Microsoft.Extensions.AI;

IChatClient chatClient = new RekaClient("your-api-key");

var weatherTool = AIFunctionFactory.Create(
    (string location) => $"The weather in {location} is 72F and sunny.",
    "get_weather",
    "Gets the current weather for a location");

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "What's the weather in Tokyo?")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        Tools = [weatherTool],
    });

Multimodal (images, audio, video, PDF)

using Microsoft.Extensions.AI;

IChatClient chatClient = new RekaClient("your-api-key");

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What do you see in this image?"),
            new UriContent(new Uri("https://example.com/photo.png"), "image/png"),
        ]),
    ],
    new ChatOptions { ModelId = "reka-flash" });

Structured JSON output

using Microsoft.Extensions.AI;

IChatClient chatClient = new RekaClient("your-api-key");

var schema = System.Text.Json.JsonDocument.Parse("""
{
    "type": "object",
    "properties": {
        "name": { "type": "string" },
        "age": { "type": "integer" }
    },
    "required": ["name", "age"],
    "additionalProperties": false
}
""").RootElement;

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Return info about Alice who is 30.")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        ResponseFormat = new ChatResponseFormatJson(schema, "person", "A person object"),
    });

Speech-to-text (ISpeechToTextClient)

using Microsoft.Extensions.AI;

ISpeechToTextClient speechClient = new RekaClient("your-api-key");

await using var audioStream = File.OpenRead("recording.wav");
var response = await speechClient.GetTextAsync(audioStream);

Console.WriteLine(response.Text);

Speech transcription (raw API)

var response = await client.Speech.TranscribeOrTranslateAsync(new TranscribeOrTranslateRequest
{
    AudioUrl = "https://example.com/audio.wav",
    SamplingRate = 16000,
});

Console.WriteLine(response.Transcript);

Translation

var response = await client.Speech.TranscribeOrTranslateAsync(new TranscribeOrTranslateRequest
{
    AudioUrl = "https://example.com/audio.wav",
    SamplingRate = 16000,
    TargetLanguage = TranscribeOrTranslateRequestTargetLanguage.French,
    IsTranslate = true,
});

Console.WriteLine(response.Translation);

Research model

var response = await client.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash-research",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "What are the latest developments in quantum computing?",
        },
    ],
    Research = new ResearchConfig
    {
        WebSearch = new WebSearchConfig { Enabled = true, MaxUses = 5 },
        ParallelThinking = new ParallelThinkingConfig { Mode = ParallelThinkingConfigMode.Low },
    },
});

List models

var models = await client.Models.ListModelsAsync();

foreach (var model in models.Data)
{
    Console.WriteLine(model.Id);
}

Chat Client Audio Url

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What language is spoken in this audio? Answer in one word."),
            new UriContent(new Uri(TestAudioUrl), "audio/wav"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Data Content Audio

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

// Download audio and send as inline DataContent (base64)
using var httpClient = new HttpClient();
var audioBytes = await httpClient.GetByteArrayAsync(TestAudioUrl);

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What language is spoken in this audio? Answer in one word."),
            new DataContent(audioBytes, "audio/wav"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Data Content Image

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

// Download image and send as inline DataContent (base64)
using var httpClient = new HttpClient();
var imageBytes = await httpClient.GetByteArrayAsync(TestImageUrl);

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What do you see in this image? Answer in one sentence."),
            new DataContent(imageBytes, "image/png"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Get Response Async

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [new(ChatRole.User, "Say hello in 5 words")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    });

Console.WriteLine(response.Text);

Chat Client Get Service Metadata

// These tests don't need a real API key — metadata is local-only
using var api = new RekaClient("dummy-key");
MeaiChatClient chatClient = api;

var metadata = chatClient.GetService<ChatClientMetadata>();

Chat Client Get Service Self

using var api = new RekaClient("dummy-key");
MeaiChatClient chatClient = api;

var self = chatClient.GetService<RekaClient>();

Chat Client Get Service Unknown Returns Null

using var api = new RekaClient("dummy-key");
MeaiChatClient chatClient = api;

var unknown = chatClient.GetService<string>();

Chat Client Get Streaming Response Async

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var allText = new System.Text.StringBuilder();
var updateCount = 0;
string? responseId = null;
string? modelId = null;
ChatFinishReason? finishReason = null;

await foreach (var update in chatClient.GetStreamingResponseAsync(
    [new(ChatRole.User, "Count from 1 to 5")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    }))
{
    updateCount++;
    responseId ??= update.ResponseId;
    modelId ??= update.ModelId;
    finishReason = update.FinishReason ?? finishReason;

    if (update.Text is not null)
    {
        allText.Append(update.Text);
    }
}

Console.WriteLine($"Received {updateCount} chunks");
Console.WriteLine($"Full text: {allText}");

Chat Client Image Url Streaming

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var allText = new System.Text.StringBuilder();
var updateCount = 0;

await foreach (var update in chatClient.GetStreamingResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What do you see in this image? Answer in one sentence."),
            new UriContent(new Uri(TestImageUrl), "image/png"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    }))
{
    updateCount++;
    if (update.Text is not null)
    {
        allText.Append(update.Text);
    }
}

Console.WriteLine($"Received {updateCount} chunks");
Console.WriteLine($"Full text: {allText}");

Chat Client Image Url

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What do you see in this image? Answer in one sentence."),
            new UriContent(new Uri(TestImageUrl), "image/png"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Invalid Model

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var action = () => chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Hello")],
    new ChatOptions
    {
        ModelId = "nonexistent-model-12345",
        MaxOutputTokens = 16,
    });

Chat Client Max Tokens One

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Write a very long essay about the history of computing")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 1,
    });

Console.WriteLine($"Text: {response.Text}");
Console.WriteLine($"Finish reason: {response.FinishReason}");

Chat Client Multiple Content Parts

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("Describe what you see."),
            new UriContent(new Uri(TestImageUrl), "image/png"),
            new TextContent("Now summarize in exactly 3 words."),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Pdf Url

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What does this PDF document contain? Answer in one sentence."),
            new UriContent(new Uri(TestPdfUrl), "application/pdf"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Client Response Format Json Schema

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var schema = JsonSerializer.Deserialize<JsonElement>("""
    {
        "type": "object",
        "properties": {
            "scientists": {
                "type": "array",
                "items": {
                    "type": "object",
                    "properties": {
                        "name": { "type": "string" },
                        "field": { "type": "string" }
                    },
                    "required": ["name", "field"]
                }
            }
        },
        "required": ["scientists"]
    }
    """);

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "List 2 famous scientists and their field")],
    new ChatOptions
    {
        ModelId = "reka-flash-research",
        MaxOutputTokens = 256,
        ResponseFormat = ChatResponseFormat.ForJsonSchema(schema, "scientists_list", "A list of scientists"),
    });

Console.WriteLine($"Response: {response.Text}");

// Verify it's valid JSON matching the schema
var doc = JsonDocument.Parse(response.Text!);

Chat Client Seed Reproducibility

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var options = new ChatOptions
{
    ModelId = "reka-flash",
    MaxOutputTokens = 32,
    Temperature = 0,
    Seed = 42,
};

var response1 = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Say exactly: 'Hello World 123'")],
    options);

var response2 = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Say exactly: 'Hello World 123'")],
    options);

Console.WriteLine($"Response 1: {response1.Text}");
Console.WriteLine($"Response 2: {response2.Text}");

// With same seed and temperature=0, outputs should be identical

Chat Client Tool Calling Required Mode

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var getTimeTool = AIFunctionFactory.Create(
    (string timezone) => $"The current time in {timezone} is 2:30 PM.",
    "get_time",
    "Gets the current time in a timezone");

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Hello!")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 256,
        Tools = [getTimeTool],
        ToolMode = ChatToolMode.RequireAny,
    });

Console.WriteLine($"Finish reason: {response.FinishReason}");

// With required tool mode, the model should always produce a tool call

var functionCalls = response.Messages
    .SelectMany(m => m.Contents)
    .OfType<FunctionCallContent>()
    .ToList();

Chat Client Tool Calling Round Trip

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var getWeatherTool = AIFunctionFactory.Create(
    (string location) => $"The weather in {location} is 72°F and sunny.",
    "get_weather",
    "Gets the current weather for a location");

List<ChatMessage> messages =
[
    new(ChatRole.User, "What's the weather like in San Francisco? Use the tool to find out."),
];

var options = new ChatOptions
{
    ModelId = "reka-flash",
    MaxOutputTokens = 256,
    Tools = [getWeatherTool],
};

// First call: model should request tool
var response = await chatClient.GetResponseAsync(messages, options);

Console.WriteLine($"First response finish reason: {response.FinishReason}");

// Add assistant message with tool calls to conversation
messages.AddRange(response.Messages);

// Process each tool call and add results
foreach (var functionCall in response.Messages
             .SelectMany(m => m.Contents)
             .OfType<FunctionCallContent>())
{
    var result = await getWeatherTool.InvokeAsync(
        new AIFunctionArguments(functionCall.Arguments ?? new Dictionary<string, object?>()));

    messages.Add(new ChatMessage(ChatRole.Tool,
    [
        new FunctionResultContent(functionCall.CallId, result),
    ]));
}

// Second call: model should use tool result to answer
// Remove tools to prevent re-calling (Reka sends tool results as user messages)
var followUpOptions = new ChatOptions
{
    ModelId = options.ModelId,
    MaxOutputTokens = options.MaxOutputTokens,
};
var finalResponse = await chatClient.GetResponseAsync(messages, followUpOptions);

Console.WriteLine($"Final response: {finalResponse.Text}");
Console.WriteLine($"Final finish reason: {finalResponse.FinishReason}");

Chat Client Tool Calling Streaming

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var getWeatherTool = AIFunctionFactory.Create(
    (string location) => $"The weather in {location} is 72°F and sunny.",
    "get_weather",
    "Gets the current weather for a location");

var updates = new List<Microsoft.Extensions.AI.ChatResponseUpdate>();
await foreach (var update in chatClient.GetStreamingResponseAsync(
    [new ChatMessage(ChatRole.User, "What's the weather like in San Francisco?")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 256,
        Tools = [getWeatherTool],
    }))
{
    updates.Add(update);
}

// Check that tool calls were emitted
var functionCalls = updates
    .SelectMany(u => u.Contents)
    .OfType<FunctionCallContent>()
    .ToList();

var toolCall = functionCalls[0];
Console.WriteLine($"Streaming tool call: {toolCall.Name}({string.Join(", ", toolCall.Arguments?.Select(kv => $"{kv.Key}={kv.Value}") ?? [])})");

// Check finish reason
var finishReason = updates.LastOrDefault(u => u.FinishReason is not null)?.FinishReason;

Chat Client Tool Calling

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var getWeatherTool = AIFunctionFactory.Create(
    (string location) => $"The weather in {location} is 72°F and sunny.",
    "get_weather",
    "Gets the current weather for a location");

List<ChatMessage> messages =
[
    new(ChatRole.User, "What's the weather like in San Francisco?"),
];

var response = await chatClient.GetResponseAsync(
    messages,
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 256,
        Tools = [getWeatherTool],
    });

Console.WriteLine($"Finish reason: {response.FinishReason}");

// The model should request a tool call

var functionCalls = response.Messages
    .SelectMany(m => m.Contents)
    .OfType<FunctionCallContent>()
    .ToList();

var toolCall = functionCalls[0];
Console.WriteLine($"Tool call: {toolCall.Name}({string.Join(", ", toolCall.Arguments?.Select(kv => $"{kv.Key}={kv.Value}") ?? [])})");

Chat Client Video Url

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.User,
        [
            new TextContent("What do you see in this video? Answer in one sentence."),
            new UriContent(new Uri(TestVideoUrl), "video/webm"),
        ]),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Completion Invalid Model

using var api = new RekaClient(apiKey);

var action = () => api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "nonexistent-model-12345",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "Hello",
        },
    ],
    MaxTokens = 16,
});

Chat Completion Max Tokens One

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "Write a very long essay about the history of computing",
        },
    ],
    MaxTokens = 1,
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");
Console.WriteLine($"Finish reason: {response.Choices[0].FinishReason}");

// With max_tokens=1, the model should hit the length limit

Chat Completion Stop Sequence

using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [new ChatMessage(ChatRole.User, "Count from 1 to 10, separated by commas")],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 128,
        StopSequences = ["5"],
    });

Console.WriteLine($"Response: {response.Text}");

// The response should stop before or at "5"

Chat Completion System Message As User

// Reka doesn't support system role — verify it works when passed through IChatClient
// (system messages should be converted to user messages)
using var api = new RekaClient(apiKey);
MeaiChatClient chatClient = api;

var response = await chatClient.GetResponseAsync(
    [
        new ChatMessage(ChatRole.System, "You are a pirate. Always respond in pirate speak."),
        new ChatMessage(ChatRole.User, "Say hello"),
    ],
    new ChatOptions
    {
        ModelId = "reka-flash",
        MaxOutputTokens = 64,
    });

Console.WriteLine($"Response: {response.Text}");

Chat Completion Temperature

using var api = new RekaClient(apiKey);

// Temperature 0 should produce deterministic output
var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "What is 2+2? Answer with just the number.",
        },
    ],
    MaxTokens = 16,
    Temperature = 0.0,
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");

Chat Completion

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "Say hello in 5 words",
        },
    ],
    MaxTokens = 64,
});

Console.WriteLine(response.Choices[0].Message.Content);

Meai Mapping Assistant And Tool Roles

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User, "Hello"),
            new ChatMessage(ChatRole.Assistant, "Hi!"),
            new ChatMessage(ChatRole.Tool,
            [
                new FunctionResultContent("call_123", "result data"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var messages = capture.LastRequestBody!.RootElement.GetProperty("messages");
// Reka doesn't support tool_call_id on user messages — tool result is formatted as text

Meai Mapping Audio Uri Content

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("Transcribe"),
                new UriContent(new Uri("https://example.com/audio.wav"), "audio/wav"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Data Content Audio

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("Transcribe"),
                new DataContent(new byte[] { 0x52, 0x49, 0x46, 0x46 }, "audio/wav"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Data Content Image

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("What is this?"),
                new DataContent(new byte[] { 0x89, 0x50, 0x4E, 0x47 }, "image/png"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Default Model

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [new ChatMessage(ChatRole.User, "Hello")],
        options: null);
}
catch { }

capture.LastRequestBody!.RootElement

Meai Mapping Image Uri Content

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("Describe this"),
                new UriContent(new Uri("https://example.com/image.png"), "image/png"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Multiple Text Contents Switch To Parts

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("First"),
                new TextContent("Second"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var content = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Options

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [new ChatMessage(ChatRole.User, "Hello")],
        new ChatOptions
        {
            ModelId = "reka-core",
            MaxOutputTokens = 512,
            Temperature = 0.7f,
            TopP = 0.9f,
            TopK = 50,
            FrequencyPenalty = 0.5f,
            PresencePenalty = 0.3f,
            StopSequences = ["END", "STOP"],
        });
}
catch { }

var root = capture.LastRequestBody!.RootElement;

Meai Mapping Pdf Uri Content

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("Summarize"),
                new UriContent(new Uri("https://example.com/doc.pdf"), "application/pdf"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Meai Mapping Response Format Json

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

var schema = JsonSerializer.Deserialize<JsonElement>("""
    {
        "type": "object",
        "properties": {
            "answer": { "type": "string" }
        },
        "required": ["answer"]
    }
    """);

try
{
    await chatClient.GetResponseAsync(
        [new ChatMessage(ChatRole.User, "Hello")],
        new ChatOptions
        {
            ModelId = "reka-flash",
            ResponseFormat = ChatResponseFormat.ForJsonSchema(schema, "test_schema", "A test schema"),
        });
}
catch { }

var body = capture.LastRequestBody!.RootElement;
var rf = body.GetProperty("response_format");

Meai Mapping Seed

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [new ChatMessage(ChatRole.User, "Hello")],
        new ChatOptions
        {
            ModelId = "reka-flash",
            Seed = 42,
        });
}
catch { }

var body = capture.LastRequestBody!.RootElement;

Meai Mapping System Message Converted To User

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.System, "You are a helpful assistant."),
            new ChatMessage(ChatRole.User, "Hello"),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { /* expected — mock returns error */ }

var body = capture.LastRequestBody;

var messages = body!.RootElement.GetProperty("messages");

Meai Mapping Video Uri Content

var (client, capture) = CreateCapturingClient();
using var _ = client;
MeaiChatClient chatClient = client;

try
{
    await chatClient.GetResponseAsync(
        [
            new ChatMessage(ChatRole.User,
            [
                new TextContent("Describe video"),
                new UriContent(new Uri("https://example.com/video.mp4"), "video/mp4"),
            ]),
        ],
        new ChatOptions { ModelId = "reka-flash" });
}
catch { }

var parts = capture.LastRequestBody!.RootElement
    .GetProperty("messages")[0].GetProperty("content");

Models

using var api = new RekaClient(apiKey);

var response = await api.Models.ListModelsAsync();

Console.WriteLine($"Available models: {response.Data.Count}");
foreach (var model in response.Data)
{
    Console.WriteLine($"  - {model.Id}");
}

Research Chat Completion

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash-research",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "What is the capital of France?",
        },
    ],
    MaxTokens = 256,
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");

Research With Parallel Thinking

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash-research",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "Explain the theory of relativity in simple terms",
        },
    ],
    MaxTokens = 512,
    Research = new ResearchConfig
    {
        WebSearch = new WebSearchConfig
        {
            Enabled = true,
        },
        ParallelThinking = new ParallelThinkingConfig
        {
            Mode = ParallelThinkingConfigMode.Low,
        },
    },
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");

if (response.Choices[0].Message.ReasoningContent is not null)
{
    Console.WriteLine($"Reasoning content: {response.Choices[0].Message.ReasoningContent}");
}

Research With Response Format

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash-research",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "List 3 famous scientists and their main contribution",
        },
    ],
    MaxTokens = 512,
    ResponseFormat = new ResponseFormat
    {
        Type = ResponseFormatType.JsonSchema,
        JsonSchema = new JsonSchemaConfig
        {
            Name = "scientists",
            Description = "A list of scientists",
            Schema = System.Text.Json.JsonSerializer.Deserialize<object>("""
                {
                    "type": "object",
                    "properties": {
                        "scientists": {
                            "type": "array",
                            "items": {
                                "type": "object",
                                "properties": {
                                    "name": { "type": "string" },
                                    "contribution": { "type": "string" }
                                },
                                "required": ["name", "contribution"]
                            }
                        }
                    },
                    "required": ["scientists"]
                }
                """)!,
        },
    },
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");

// Verify it's valid JSON
var action = () => System.Text.Json.JsonDocument.Parse(response.Choices[0].Message.Content!);

Research With Web Search

using var api = new RekaClient(apiKey);

var response = await api.Chat.CreateChatCompletionAsync(new CreateChatCompletionRequest
{
    Model = "reka-flash-research",
    Messages =
    [
        new ChatMessageInput
        {
            Role = ChatMessageInputRole.User,
            Content = "What is the current weather in Tokyo?",
        },
    ],
    MaxTokens = 512,
    Research = new ResearchConfig
    {
        WebSearch = new WebSearchConfig
        {
            Enabled = true,
            MaxUses = 3,
        },
    },
});

Console.WriteLine($"Content: {response.Choices[0].Message.Content}");

// Research model may return reasoning steps and annotations
if (response.Choices[0].Message.ReasoningSteps is { Count: > 0 } steps)
{
    Console.WriteLine($"Reasoning steps: {steps.Count}");
    foreach (var step in steps)
    {
        Console.WriteLine($"  Step role={step.Role}: {step.ReasoningContent ?? step.Content}");
    }
}

if (response.Choices[0].Message.Annotations is { Count: > 0 } annotations)
{
    Console.WriteLine($"Annotations: {annotations.Count}");
    foreach (var annotation in annotations)
    {
        Console.WriteLine($"  Citation: {annotation.UrlCitation?.Title} - {annotation.UrlCitation?.Url}");
    }
}

Speech To Text Client Get Service Metadata

using var api = new RekaClient("dummy-key");
MeaiSpeechToTextClient speechClient = api;

var metadata = speechClient.GetService<SpeechToTextClientMetadata>();

Speech To Text Client Get Service Self

using var api = new RekaClient("dummy-key");
MeaiSpeechToTextClient speechClient = api;

var self = speechClient.GetService<RekaClient>();

Speech To Text Client Get Streaming Text Async

using var api = new RekaClient(apiKey);
MeaiSpeechToTextClient speechClient = api;

using var httpClient = new HttpClient();
await using var audioStream = await httpClient.GetStreamAsync(
    TestAudioUrl);

var ms = new MemoryStream();
await audioStream.CopyToAsync(ms);
ms.Position = 0;

var updates = new List<SpeechToTextResponseUpdate>();
await foreach (var update in speechClient.GetStreamingTextAsync(ms))
{
    updates.Add(update);
    Console.WriteLine($"Update: {update.Text}");
}

Speech To Text Client Get Text Async

using var api = new RekaClient(apiKey);
MeaiSpeechToTextClient speechClient = api;

// Download a small WAV file and pass as stream
using var httpClient = new HttpClient();
await using var audioStream = await httpClient.GetStreamAsync(
    TestAudioUrl);

// Buffer into MemoryStream since the API needs to convert to base64
var ms = new MemoryStream();
await audioStream.CopyToAsync(ms);
ms.Position = 0;

var response = await speechClient.GetTextAsync(ms);

Console.WriteLine($"Text: {response.Text}");

Speech To Text Client Translation

using var api = new RekaClient(apiKey);
MeaiSpeechToTextClient speechClient = api;

// Use RawRepresentationFactory to configure translation via target_language
var options = new SpeechToTextOptions
{
    RawRepresentationFactory = _ => new TranscribeOrTranslateRequest
    {
        AudioUrl = TestAudioUrl,
        SamplingRate = 16000,
        TargetLanguage = TranscribeOrTranslateRequestTargetLanguage.French,
        IsTranslate = true,
    },
};

using var emptyStream = new MemoryStream();
var response = await speechClient.GetTextAsync(emptyStream, options);

Console.WriteLine($"Transcript: {response.Text}");

// Verify the underlying response has the translation
var rawResponse = (TranscribeOrTranslateResponse)response.RawRepresentation!;
Console.WriteLine($"Translation: {rawResponse.Translation}");

Speech To Text Client With Raw Representation Factory

using var api = new RekaClient(apiKey);
MeaiSpeechToTextClient speechClient = api;

// Use RawRepresentationFactory to pass a pre-configured request with a URL
var options = new SpeechToTextOptions
{
    RawRepresentationFactory = _ => new TranscribeOrTranslateRequest
    {
        AudioUrl = TestAudioUrl,
        SamplingRate = 16000,
    },
};

// Pass an empty stream since URL is provided via factory
using var emptyStream = new MemoryStream();
var response = await speechClient.GetTextAsync(emptyStream, options);

Console.WriteLine($"Text: {response.Text}");

Transcribe Audio

using var api = new RekaClient(apiKey);

var response = await api.Speech.TranscribeOrTranslateAsync(new TranscribeOrTranslateRequest
{
    AudioUrl = TestAudioUrl,
    SamplingRate = 16000,
});

Console.WriteLine($"Transcript: {response.Transcript}");

Translate Audio

using var api = new RekaClient(apiKey);

var response = await api.Speech.TranscribeOrTranslateAsync(new TranscribeOrTranslateRequest
{
    AudioUrl = TestAudioUrl,
    SamplingRate = 16000,
    TargetLanguage = TranscribeOrTranslateRequestTargetLanguage.French,
    IsTranslate = true,
});

Console.WriteLine($"Transcript: {response.Transcript}");
Console.WriteLine($"Translation: {response.Translation}");

// Note: transcript_translation_with_timestamp may not be returned for translations

License

MIT

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assets		assets
docs		docs
src		src
.gitignore		.gitignore
AGENTS.md		AGENTS.md
CLAUDE.md		CLAUDE.md
LICENSE		LICENSE
README.md		README.md
Reka.slnx		Reka.slnx
autosdk.docs.json		autosdk.docs.json
mkdocs.yml		mkdocs.yml

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Reka .NET SDK

Installation

Usage

Create a client

Chat completion

Streaming

Microsoft.Extensions.AI (IChatClient)

Tool calling

Multimodal (images, audio, video, PDF)

Structured JSON output

Speech-to-text (ISpeechToTextClient)

Speech transcription (raw API)

Translation

Research model

List models

Chat Client Audio Url

Chat Client Data Content Audio

Chat Client Data Content Image

Chat Client Get Response Async

Chat Client Get Service Metadata

Chat Client Get Service Self

Chat Client Get Service Unknown Returns Null

Chat Client Get Streaming Response Async

Chat Client Image Url Streaming

Chat Client Image Url

Chat Client Invalid Model

Chat Client Max Tokens One

Chat Client Multiple Content Parts

Chat Client Pdf Url

Chat Client Response Format Json Schema

Chat Client Seed Reproducibility

Chat Client Tool Calling Required Mode

Chat Client Tool Calling Round Trip

Chat Client Tool Calling Streaming

Chat Client Tool Calling

Chat Client Video Url

Chat Completion Invalid Model

Chat Completion Max Tokens One

Chat Completion Stop Sequence

Chat Completion System Message As User

Chat Completion Temperature

Chat Completion

Meai Mapping Assistant And Tool Roles

Meai Mapping Audio Uri Content

Meai Mapping Data Content Audio

Meai Mapping Data Content Image

Meai Mapping Default Model

Meai Mapping Image Uri Content

Meai Mapping Multiple Text Contents Switch To Parts

Meai Mapping Options

Meai Mapping Pdf Uri Content

Meai Mapping Response Format Json

Meai Mapping Seed

Meai Mapping System Message Converted To User

Meai Mapping Video Uri Content

Models

Research Chat Completion

Research With Parallel Thinking

Research With Response Format

Research With Web Search

Speech To Text Client Get Service Metadata

Speech To Text Client Get Service Self

Speech To Text Client Get Streaming Text Async

Speech To Text Client Get Text Async

Speech To Text Client Translation

Speech To Text Client With Raw Representation Factory

Transcribe Audio

Translate Audio

License

About

Topics

Resources

License

Code of conduct

Contributing