feat: add Gemini CLI provider for free access to Gemini models (#5134)

packages/types/src/provider-settings.ts

@@ -19,6 +19,7 @@ export const providerNames = [
 	"vscode-lm",
 	"lmstudio",
 	"gemini",
+	"gemini-cli",
 	"openai-native",
 	"mistral",
 	"deepseek",
@@ -158,6 +159,11 @@ const geminiSchema = apiModelIdProviderModelSchema.extend({
 	googleGeminiBaseUrl: z.string().optional(),
 })
 
+const geminiCliSchema = apiModelIdProviderModelSchema.extend({
+	geminiCliOAuthPath: z.string().optional(),
+	geminiCliProjectId: z.string().optional(),
+})
+
 const openAiNativeSchema = apiModelIdProviderModelSchema.extend({
 	openAiNativeApiKey: z.string().optional(),
 	openAiNativeBaseUrl: z.string().optional(),
@@ -223,6 +229,7 @@ export const providerSettingsSchemaDiscriminated = z.discriminatedUnion("apiProv
 	vsCodeLmSchema.merge(z.object({ apiProvider: z.literal("vscode-lm") })),
 	lmStudioSchema.merge(z.object({ apiProvider: z.literal("lmstudio") })),
 	geminiSchema.merge(z.object({ apiProvider: z.literal("gemini") })),
+	geminiCliSchema.merge(z.object({ apiProvider: z.literal("gemini-cli") })),
 	openAiNativeSchema.merge(z.object({ apiProvider: z.literal("openai-native") })),
 	mistralSchema.merge(z.object({ apiProvider: z.literal("mistral") })),
 	deepSeekSchema.merge(z.object({ apiProvider: z.literal("deepseek") })),
@@ -250,6 +257,7 @@ export const providerSettingsSchema = z.object({
 	...vsCodeLmSchema.shape,
 	...lmStudioSchema.shape,
 	...geminiSchema.shape,
+	...geminiCliSchema.shape,
 	...openAiNativeSchema.shape,
 	...mistralSchema.shape,
 	...deepSeekSchema.shape,

packages/types/src/providers/gemini-cli.ts

@@ -0,0 +1,110 @@
+import type { ModelInfo } from "../model.js"
+
+// Gemini CLI models with free tier pricing (all $0)
+export type GeminiCliModelId = keyof typeof geminiCliModels
+
+export const geminiCliDefaultModelId: GeminiCliModelId = "gemini-2.0-flash-001"
+
+export const geminiCliModels = {
+	"gemini-2.0-flash-001": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-2.0-flash-thinking-exp-01-21": {
+		maxTokens: 65_536,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-2.0-flash-thinking-exp-1219": {
+		maxTokens: 8192,
+		contextWindow: 32_767,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-2.0-flash-exp": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-1.5-flash-002": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-1.5-flash-exp-0827": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-1.5-flash-8b-exp-0827": {
+		maxTokens: 8192,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-1.5-pro-002": {
+		maxTokens: 8192,
+		contextWindow: 2_097_152,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-1.5-pro-exp-0827": {
+		maxTokens: 8192,
+		contextWindow: 2_097_152,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-exp-1206": {
+		maxTokens: 8192,
+		contextWindow: 2_097_152,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+	},
+	"gemini-2.5-flash": {
+		maxTokens: 64_000,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		maxThinkingTokens: 24_576,
+		supportsReasoningBudget: true,
+	},
+	"gemini-2.5-pro": {
+		maxTokens: 64_000,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: false,
+		inputPrice: 0,
+		outputPrice: 0,
+		maxThinkingTokens: 32_768,
+		supportsReasoningBudget: true,
+		requiredReasoningBudget: true,
+	},
+} as const satisfies Record<string, ModelInfo>

packages/types/src/providers/index.ts

@@ -4,6 +4,7 @@ export * from "./chutes.js"
 export * from "./claude-code.js"
 export * from "./deepseek.js"
 export * from "./gemini.js"
+export * from "./gemini-cli.js"
 export * from "./glama.js"
 export * from "./groq.js"
 export * from "./lite-llm.js"

src/api/index.ts

@@ -15,6 +15,7 @@ import {
 	OllamaHandler,
 	LmStudioHandler,
 	GeminiHandler,
+	GeminiCliHandler,
 	OpenAiNativeHandler,
 	DeepSeekHandler,
 	MistralHandler,
@@ -85,6 +86,8 @@ export function buildApiHandler(configuration: ProviderSettings): ApiHandler {
 			return new LmStudioHandler(options)
 		case "gemini":
 			return new GeminiHandler(options)
+		case "gemini-cli":
+			return new GeminiCliHandler(options)
 		case "openai-native":
 			return new OpenAiNativeHandler(options)
 		case "deepseek":