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chore(gemini): deprecate older Gemini models and remove obsolete functionality #10232

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chore(gemini): deprecate older Gemini models and remove obsolete functionality #10232

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@0xlakshan 0xlakshan commented Nov 14, 2025 •
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Background

All Gemini Model 1 series have been deprecated and are no longer supported by Gemini. I'm removing obsolete functionalities, introducing a convenient way to check model tool capabilities, and updating all e2e tests, unit tests, chat options, examples, and documentation with the recommended replacements.

Summary

  • Removing obsolete functionalities
  • Convenient way to check model tool capabilities
  • Removing deprecated model IDs
  • Introduce a convenient way to check model tool capabilities. (as Gemini has so many models)
  • Workaround for msw route collision issue
  • Update Examples
  • Tests
  • Docs

Convenient way to check model tool capabilities

Google releases base models gemini-2.5-flash-lite gemini-2.5-pro along with various sub-model variants gemini-2.0-flash-lite-001 gemini-2.0-flash-exp. Each model offers different tool-calling capabilities.

Since the docs explicitly define tool support the base models, I decided to maintain a set of unsupported models check the model IDs against it to determine the tool support.

Tool support - https://ai.google.dev/gemini-api/docs/models

ai/packages/google/src/gemini-tool-capabilities.ts

Lines 68 to 76 in 80dab97

/**
* Returns `true` if the tool is supported, `false` if it is unsupported.
*/
export function IsToolSupported(
tool: ToolUnsupportedModelGroup,
toolName: GoogleGenerativeAIModelId,
): boolean {
return !(tool as readonly string[]).includes(toolName);
}

ai/packages/google/src/google-prepare-tools.ts

Lines 112 to 120 in b5d790c

if (IsToolSupported(FILE_SEARCH_UNSUPPORTED_MODELS, modelId)) {
googleTools.push({ fileSearch: { ...tool.args } });
} else {
toolWarnings.push({
type: 'unsupported',
feature: `provider-defined tool ${tool.id}`,
details: `The file search tool is not supported on the following models: ${getUnsupportedModelsString(FILE_SEARCH_UNSUPPORTED_MODELS)}. Current model: ${modelId}`,
});
}

Relevant Links

Tool support - https://ai.google.dev/gemini-api/docs/models
Deprecated base models - https://docs.cloud.google.com/vertex-ai/generative-ai/docs/learn/model-versions#retired-models
Deprecated base models & sub model variants - https://ai.google.dev/gemini-api/docs/changelog

@gr2m gr2m marked this pull request as draft November 14, 2025 18:30
@dancer dancer self-assigned this Nov 18, 2025
@dancer dancer self-requested a review November 18, 2025 19:14
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dancer commented Nov 18, 2025

thank you for this pr please give me a ping whenever this is done! appreciate it a bunch @0xlakshan

@dancer dancer assigned 0xlakshan and dancer and unassigned dancer Nov 18, 2025
@theg1239
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theg1239 commented Nov 18, 2025

Due to the introduction of Gemini 3.0 Pro, it would make sense to have that in place of the Gemini 2.5 Pro references

@0xlakshan 0xlakshan changed the title chore(gemini): replace deprecated gemini models chore(gemini): deprecate older Gemini models and remove obsolete functionality Nov 26, 2025
@0xlakshan 0xlakshan marked this pull request as ready for review November 26, 2025 15:20
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0xlakshan commented Nov 26, 2025 •
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Hey @gr2m @dancer , PR’s ready for review. Let me know if you need anything from me, I’m around and available, Thanks

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0xlakshan commented Dec 9, 2025

Quick update! merge conflicts are resolved and the PR is up to date again. @gr2m @dancer @lgrammel , Just nudging this PR back onto your radar 😊

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