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feat: translate response_format to Anthropic output_config for structured output #5640

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feat: translate response_format to Anthropic output_config for structured output #5640

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28 changes: 28 additions & 0 deletions packages/llm-mapper/transform/providers/openai/request/toAnthropic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,34 @@ export function toAnthropic(
throw new Error("Logit bias is not supported");
}

// Map response_format to Anthropic's output_config.format
// OpenAI uses `response_format: { type: "json_schema", json_schema: { schema, name } }`
// Anthropic uses `output_config: { format: { type: "json_schema", json_schema: { schema, name } } }`
// Note: Anthropic does not support `strict` (OpenAI-specific), so it is omitted.
if (
openAIBody.response_format &&
typeof openAIBody.response_format === "object" &&
"type" in openAIBody.response_format &&
openAIBody.response_format.type === "json_schema" &&
"json_schema" in openAIBody.response_format
) {
const jsonSchema = (openAIBody.response_format as any).json_schema;
if (jsonSchema?.schema) {
antBody.output_config = {
format: {
type: "json_schema",
json_schema: {
schema: jsonSchema.schema,
...(jsonSchema.name && { name: jsonSchema.name }),
...(jsonSchema.description && {
description: jsonSchema.description,
}),
},
},
};
}
}

// Map context_editing to Anthropic's context_management
if (openAIBody.context_editing?.enabled) {
antBody.context_management = mapContextEditing(openAIBody.context_editing);
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16 changes: 16 additions & 0 deletions packages/llm-mapper/transform/types/anthropic.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,22 @@ export interface AnthropicRequestBody {
* @see https://docs.anthropic.com/en/docs/build-with-claude/context-editing
*/
context_management?: AnthropicContextManagement;
/**
* Structured output configuration for JSON schema-constrained responses.
* @see https://docs.anthropic.com/en/docs/build-with-claude/structured-output
*/
output_config?: AnthropicOutputConfig;
}

export interface AnthropicOutputConfig {
format: {
type: "json_schema";
json_schema: {
schema: Record<string, unknown>;
name?: string;
description?: string;
};
};
}

export type AnthropicThinkingConfig = {
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