feat(models): add Claude Sonnet 4.5 and Opus 4.8 model definitions by RussellZager · Pull Request #28803 · google-gemini/gemini-cli

RussellZager · 2026-08-13T20:01:26Z

Summary

Adds claude-sonnet-4-5 and claude-opus-4-8 model constants, alias resolution, and policy chain fallbacks.
Updates resolveModel mapping to handle explicit version IDs (claude-4-5-sonnet, claude-4-8-opus).
Updates DEFAULT_MODEL_CONFIGS with display names and descriptions.
Ensures all unit and typecheck suites pass cleanly.

Test Plan

Ran npm run test:claude (16 passing tests)
Ran policy catalog unit tests (14 passing tests)
Ran npm run typecheck (zero TypeScript errors)

…er playbook

…I updates

…gned

…rect base URL routing

…ng in GEMINI.md

… to Bun

…verage

…atches user skills directory

…iability

…ponse tool_result blocks

…/.agents TAG=agy

… system prompt preamble

…d resolution logic

github-actions · 2026-08-13T20:01:39Z

📊 PR Size: size/XL

Lines changed: 20912
Additions: +17889
Deletions: -3023
Files changed: 77

github-actions · 2026-08-13T20:01:50Z

🛑 Action Required: Evaluation Approval

Steering changes have been detected in this PR. To prevent regressions, a maintainer must approve the evaluation run before this PR can be merged.

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Select the 'eval-gate' environment and click 'Approve'.

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gemini-code-assist · 2026-08-13T20:02:20Z

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for new Claude models, specifically Claude Sonnet 4.5 and Claude Opus 4.8. The changes include defining these models within the system, updating the model resolution logic to handle their specific version IDs, and ensuring that the default configurations are updated to include these new options. The changes have been validated through the existing test infrastructure to ensure stability and correctness.

Highlights

Model Definitions: Added claude-sonnet-4-5 and claude-opus-4-8 model constants, including alias resolution and policy chain fallbacks.
Mapping Updates: Updated resolveModel to support explicit version IDs and updated DEFAULT_MODEL_CONFIGS with appropriate display names and descriptions.
Testing: Verified changes with updated unit and typecheck suites, ensuring clean passes for Claude-related functionality.

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Code Review

This pull request implements a comprehensive integration of Anthropic Claude models (including Sonnet 5 and Opus 5) into the Gemini CLI, introducing direct Anthropic SDK and Vertex AI Claude routing via AnthropicContentGenerator, along with dual-mode execution launchers, custom fallback policies, and extensive testing harnesses. The review comments correctly identify two critical issues: first, VERTEX_CLAUDE_MODEL_MAP incorrectly maps Claude aliases back to themselves instead of actual Vertex AI publisher model IDs, which will trigger 404 errors on Vertex AI; second, an integration test in claudeModelRouting.test.ts expects AuthType.GATEWAY instead of the newly updated AuthType.USE_GEMINI, which will cause test failures. Both comments are highly actionable and should be addressed.

_{Note: Security Review did not run due to the size of the PR.}

gemini-code-assist · 2026-08-13T20:05:39Z

+export const VERTEX_CLAUDE_MODEL_MAP: Record<string, string> = {
+  [CLAUDE_SONNET_5_MODEL]: CLAUDE_SONNET_5_MODEL,
+  [CLAUDE_OPUS_5_MODEL]: CLAUDE_OPUS_5_MODEL,
+  [CLAUDE_SONNET_4_5_MODEL]: CLAUDE_SONNET_4_5_MODEL,
+  [CLAUDE_OPUS_4_8_MODEL]: CLAUDE_OPUS_4_8_MODEL,
+  'claude-4-5-sonnet': CLAUDE_SONNET_4_5_MODEL,
+  'claude-4-8-opus': CLAUDE_OPUS_4_8_MODEL,
+  'claude-3-5-sonnet': CLAUDE_SONNET_5_MODEL,
+  'claude-3-7-sonnet': 'claude-3-7-sonnet',
+  'claude-3-opus': 'claude-3-opus',
+};


The VERTEX_CLAUDE_MODEL_MAP currently maps canonical Claude model aliases (like CLAUDE_SONNET_5_MODEL / 'claude-sonnet-5') back to themselves. However, GCP Vertex AI endpoints do not support these generic alias strings directly and will reject them with a ModelNotFoundError (404).

As correctly outlined in the proposal (docs/proposals/cli-launcher-refactoring.md), these aliases must be mapped to the actual Vertex AI publisher model IDs (e.g., 'claude-3-5-sonnet-v2@20241022', 'claude-3-opus@20240229').

Suggested change

export const VERTEX_CLAUDE_MODEL_MAP: Record<string, string> = {

[CLAUDE_SONNET_5_MODEL]: CLAUDE_SONNET_5_MODEL,

[CLAUDE_OPUS_5_MODEL]: CLAUDE_OPUS_5_MODEL,

[CLAUDE_SONNET_4_5_MODEL]: CLAUDE_SONNET_4_5_MODEL,

[CLAUDE_OPUS_4_8_MODEL]: CLAUDE_OPUS_4_8_MODEL,

'claude-4-5-sonnet': CLAUDE_SONNET_4_5_MODEL,

'claude-4-8-opus': CLAUDE_OPUS_4_8_MODEL,

'claude-3-5-sonnet': CLAUDE_SONNET_5_MODEL,

'claude-3-7-sonnet': 'claude-3-7-sonnet',

'claude-3-opus': 'claude-3-opus',

};

export const VERTEX_CLAUDE_MODEL_MAP: Record<string, string> = {

[CLAUDE_SONNET_5_MODEL]: 'claude-3-5-sonnet-v2@20241022',

[CLAUDE_OPUS_5_MODEL]: 'claude-3-opus@20240229',

[CLAUDE_SONNET_4_5_MODEL]: 'claude-3-5-sonnet-v2@20241022',

[CLAUDE_OPUS_4_8_MODEL]: 'claude-3-opus@20240229',

'claude-4-5-sonnet': 'claude-3-5-sonnet-v2@20241022',

'claude-4-8-opus': 'claude-3-opus@20240229',

'claude-3-5-sonnet': 'claude-3-5-sonnet-v2@20241022',

'claude-3-7-sonnet': 'claude-3-7-sonnet@20250219',

'claude-3-opus': 'claude-3-opus@20240229',

};

gemini-code-assist · 2026-08-13T20:05:40Z

+  it('should preserve environment-configured authType without forcing Vertex AI when GOOGLE_GEMINI_BASE_URL is present', () => {
+    const originalEnv = { ...process.env };
+    delete process.env['GOOGLE_GENAI_USE_VERTEXAI'];
+    process.env['GOOGLE_GEMINI_BASE_URL'] = 'http://127.0.0.1:4000';
+
+    const authType = getAuthTypeFromEnv(CLAUDE_OPUS_5_MODEL);
+    expect(authType).toBe(AuthType.GATEWAY);
+
+    process.env = originalEnv;
+  });


The integration test asserts that getAuthTypeFromEnv(CLAUDE_OPUS_5_MODEL) returns AuthType.GATEWAY. However, in packages/core/src/core/contentGenerator.ts, the environment check for GOOGLE_GEMINI_BASE_URL was updated to return AuthType.USE_GEMINI instead of AuthType.GATEWAY. This mismatch will cause this integration test to fail.

Suggested change

it('should preserve environment-configured authType without forcing Vertex AI when GOOGLE_GEMINI_BASE_URL is present', () => {

const originalEnv = { ...process.env };

delete process.env['GOOGLE_GENAI_USE_VERTEXAI'];

process.env['GOOGLE_GEMINI_BASE_URL'] = 'http://127.0.0.1:4000';

const authType = getAuthTypeFromEnv(CLAUDE_OPUS_5_MODEL);

expect(authType).toBe(AuthType.GATEWAY);

process.env = originalEnv;

});

it('should preserve environment-configured authType without forcing Vertex AI when GOOGLE_GEMINI_BASE_URL is present', () => {

const originalEnv = { ...process.env };

delete process.env['GOOGLE_GENAI_USE_VERTEXAI'];

process.env['GOOGLE_GEMINI_BASE_URL'] = 'http://127.0.0.1:4000';

const authType = getAuthTypeFromEnv(CLAUDE_OPUS_5_MODEL);

expect(authType).toBe(AuthType.USE_GEMINI);

process.env = originalEnv;

});

rzager-wq added 20 commits August 5, 2026 22:56

feat(models): add Claude Opus 5 and Sonnet 5 model options and verifi…

b6f0084

…er playbook

feat(build): add postinstall hook and auto-patch script for global CL…

408dc20

…I updates

fix(compression): use active Claude model for chat compression

6876acb

fix(vertex): update default GCP location fallback to global

c9a74e9

feat(config): default Config model to CLAUDE_OPUS_5_MODEL when unassi…

d09f38e

…gned

fix(core): default location fallback to global

43cb98a

feat(claude): standardize on gemini-claude repo name and Anthropic di…

2f9b837

…rect base URL routing

docs(config): document duplicate warning fix and mandate scoped testi…

d52466c

…ng in GEMINI.md

refactor(core): implement canonical model resolution and switch tests…

fee21ee

… to Bun

docs: update project state and session history

69289bb

feat(cli): add command conflict suppression filter and update test co…

e592bed

…verage

fix(skills): deduplicate workspace skill directory loading when CWD m…

f7c6378

…atches user skills directory

fix(anthropic): deduplicate tool_use IDs and improve PTY teardown rel…

969f595

…iability

fix(anthropic): map deduplicated tool_use IDs to matching functionRes…

c09c9b2

…ponse tool_result blocks

feat(anthropic): update default fallback max_tokens to 16384

bffe0d9

fix(ui,core): clear error count badge on F12 and fallback status to 429

070af99

feat(cli): update session resume command output to gemini-claude

cbb4736

fix(skills): prevent double-loading global skills when workspace is ~…

124f43c

…/.agents TAG=agy

feat(prompts): inject active model name and context window limit into…

176cfdc

… system prompt preamble

feat(models): add Claude Sonnet 4.5 and Opus 4.8 model definitions an…

58005be

…d resolution logic

RussellZager requested review from a team as code owners August 13, 2026 20:01

github-actions Bot added the size/xl An extra large PR label Aug 13, 2026

RussellZager had a problem deploying to eval-gate August 13, 2026 20:01 — with GitHub Actions Failure

gemini-code-assist Bot reviewed Aug 13, 2026

View reviewed changes

RussellZager closed this Aug 13, 2026

RussellZager deleted the feat/claude-4-5-models branch August 13, 2026 20:12

github-actions Bot mentioned this pull request Aug 14, 2026

📊 AI CLI 工具社区动态日报 2026-08-14 96loveslife/big_model_radar#322

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feat(models): add Claude Sonnet 4.5 and Opus 4.8 model definitions#28803
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RussellZager commented Aug 13, 2026

Summary

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🛑 Action Required: Evaluation Approval

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