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feat: add Gemini free tier models with -free aliases #7361

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feat: add Gemini free tier models with -free aliases #7361

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43 changes: 43 additions & 0 deletions packages/types/src/providers/gemini.ts
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Expand Up @@ -295,4 +295,47 @@ export const geminiModels = {
supportsReasoningBudget: true,
maxThinkingTokens: 24_576,
},
"gemini-2.5-pro-free": {
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@roomote roomote bot Aug 23, 2025

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Consider adding a comment block above the free tier models section explaining the mapping strategy and why the -free suffix approach was chosen. This would help future maintainers understand the design decision:

maxTokens: 64_000,
contextWindow: 250_000,
supportsImages: true,
supportsPromptCache: true,
inputPrice: 0,
outputPrice: 0,
cacheReadsPrice: 0,
cacheWritesPrice: 0,
maxThinkingTokens: 32_768,
supportsReasoningBudget: true,
requiredReasoningBudget: true,
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@roomote roomote bot Aug 23, 2025

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Is it intentional that gemini-2.5-pro-free has requiredReasoningBudget: true while the other two free models don't? If free tier models have different reasoning budget requirements, could you clarify why? Otherwise, consider making this consistent across all three free tier models.

description:
"Free tier version of Gemini 2.5 Pro with 250K context window and rate limits (5 RPM, 250K TPM, 100 RPD). Set minimum 12 seconds between requests in provider settings to avoid rate limits.",
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Consider extracting the rate limit values (5 RPM, 10 RPM, 15 RPM) and recommended delays (12s, 6s, 4s) as constants for better maintainability. This could be useful for potential future rate limiting logic:

},
"gemini-2.5-flash-free": {
maxTokens: 64_000,
contextWindow: 250_000,
supportsImages: true,
supportsPromptCache: true,
inputPrice: 0,
outputPrice: 0,
cacheReadsPrice: 0,
cacheWritesPrice: 0,
maxThinkingTokens: 24_576,
supportsReasoningBudget: true,
description:
"Free tier version of Gemini 2.5 Flash with 250K context window and rate limits (10 RPM, 250K TPM, 250 RPD). Set minimum 6 seconds between requests in provider settings to avoid rate limits.",
},
"gemini-2.5-flash-lite-free": {
maxTokens: 64_000,
contextWindow: 250_000,
supportsImages: true,
supportsPromptCache: true,
inputPrice: 0,
outputPrice: 0,
cacheReadsPrice: 0,
cacheWritesPrice: 0,
supportsReasoningBudget: true,
maxThinkingTokens: 24_576,
description:
"Free tier version of Gemini 2.5 Flash Lite with 250K context window and rate limits (15 RPM, 250K TPM, 1000 RPD). Set minimum 4 seconds between requests in provider settings to avoid rate limits.",
},
} as const satisfies Record<string, ModelInfo>
10 changes: 9 additions & 1 deletion src/api/providers/gemini.ts
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Expand Up @@ -172,7 +172,15 @@ export class GeminiHandler extends BaseProvider implements SingleCompletionHandl
// reasoning model and that reasoning is required to be enabled.
// The actual model ID honored by Gemini's API does not have this
// suffix.
return { id: id.endsWith(":thinking") ? id.replace(":thinking", "") : id, info, ...params }
let apiModelId = id.endsWith(":thinking") ? id.replace(":thinking", "") : id

// The `-free` suffix indicates free tier models with rate limits.
// Map them to their corresponding paid models for API calls.
if (apiModelId.endsWith("-free")) {
apiModelId = apiModelId.replace("-free", "") as GeminiModelId
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After replacing the "-free" suffix, the resulting string is cast to GeminiModelId without validation. Could this potentially cause runtime errors if the base model doesn't exist? Consider adding validation to ensure the mapped model ID exists in geminiModels:

}

return { id: apiModelId, info, ...params }
}

private extractCitationsOnly(groundingMetadata?: GroundingMetadata): string | null {
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