feat(models): add gemini-3.6-flash, 3.5-flash-lite

[smakosh]

Summary

Adds Google's two new Gemini models released 2026-07-21, both served via Google AI Studio with flex/priority service tiers:

Model	Input	Output	Cached input	Context	Max output
gemini-3.6-flash	$1.50/M	$7.50/M	$0.15/M	1,048,576	65,536
gemini-3.5-flash-lite	$0.30/M	$2.50/M	$0.03/M	1,048,576	65,536

Both support vision, audio, PDF (document) input, tools, web search grounding ($14/1k queries), JSON output + schema, and thinking levels minimal/low/medium/high. Cache write priced at the standard $1.00/M/hr storage rate (0.08333e-6).

Notes:

• Audio input is billed at the text rate for both models (per Google's pricing page and OpenRouter), so no separate inputAudioPrice/cachedInputAudioPrice fields — unlike gemini-3.5-flash.
• AI Studio only for now: Google's launch post lists availability via the Gemini API; Vertex mappings can follow once availability/pricing is confirmed there.
• chat-json passed without healStreamingJsonOutput, so the 3.5-flash AI Studio JSON-mode workaround is not needed here.

Sources: Google launch post, Gemini API pricing, OpenRouter

Testing

• pnpm vitest run packages/models — 62/62 passed
• TEST_MODELS="google-ai-studio/gemini-3.6-flash,google-ai-studio/gemini-3.5-flash-lite" pnpm test:e2e — 26 files / 101 tests passed against the live API, including chat-basic, streaming, tool calls (+results), JSON mode, reasoning, responses API, and response healing for both models
• pnpm build — 17/17 tasks successful

https://claude.ai/code/session_01SYnRdQXLVyv7A2U27fnyxC

Summary by CodeRabbit

• New Features
  • Added support for the Gemini 3.5 Flash Lite model.
  • Added support for the Gemini 3.6 Flash model.
  • Both models support multimodal capabilities, streaming, reasoning, tools, web search, and structured JSON output.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 7c070aa7-ee6c-4545-bf2b-7cf7c43ca422

📥 Commits

Reviewing files that changed from the base of the PR and between c95a4e0 and 2588edf.

📒 Files selected for processing (1)

• packages/models/src/models/google.ts

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Walkthrough

Adds gemini-3.5-flash-lite and gemini-3.6-flash to the Google model catalog with Google AI Studio pricing, capacity limits, reasoning configuration, supported modalities, tools, web search, and JSON output.

Changes

Gemini model catalog

Layer / File(s)	Summary
Add Gemini model definitions packages/models/src/models/google.ts	Adds provider configurations for gemini-3.5-flash-lite and gemini-3.6-flash, including pricing, context and output limits, reasoning effort levels, supported modalities, tools, web search, and JSON output.
Estimated code review effort: 1 (Trivial)	~5 minutes

Possibly related PRs

• theopenco/llmgateway#3164: Updates the same Google model catalog with the same two Gemini model definitions.

Suggested reviewers: steebchen

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: adding Gemini 3.6 Flash and 3.5 Flash Lite models.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/gemini-3.6-flash-flash-lite

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