[Bug]: Google Antigravity fails with HTTP 404 "Requested entity was not found" when requesting claude-sonnet-5-5
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Assessment
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Newbie friendliness
- 55/100
- Issue type
- Bug
- Clarity
- Mostly clear
- Activity status
- Active
- Tech stack
- typescript
- Domain
- api
Research direction
Start with the provider adapter, the area named in the issue, and trace how it handles the google-antigravity/claude-sonnet-5-5-high model. Reproduce the request using the reported v2.76.0 setup and compare the model ID and upstream routing with the working Google Antigravity surface. Done means the model request no longer returns the reported 404.
Written by the indexing model from the issue text.
Description
Client or integration
Codex CLI
Area
Provider adapter
Summary
When using the google-antigravity provider with Google account authentication, requests to Claude Sonnet 5.5 fail immediately with HTTP 404 Not Found: Provider error 404: Antigravity invalid request: Requested entity was not found.
Even though Claude Sonnet 5.5 is available in the upstream Google Antigravity surface, OpenCodex either does not discover/map the model ID correctly or attempts to route claude-sonnet-5-5 / claude-sonnet-5-5-high to an upstream endpoint/ID that returns 404.
Reproduction
- Run OpenCodex (
v2.76.0) withgoogle-antigravityauthenticated via Google OAuth (multi-account setup). - Configure or select
google-antigravity/claude-sonnet-5-5-highin Codex. - Send a prompt to the model.
- The proxy returns
HTTP 404before streaming or completion begins.
Version
2.76.0
Operating system
window 11
Provider and model
google-antigravity/claude-sonnet-5-5-high
Logs or error output
unexpected status 404 Not Found: Provider error 404: Antigravity invalid request: Requested entity was not found., url: http://127.0.0.1:58285/v1/responses
Screenshots and supporting files
No response
Redacted configuration
Checks
- I searched existing issues and documentation.
- I removed secrets, tokens, account details, request credentials, and personal data.
- Dominant language
- TypeScript
- Stars
- 16.9k
- Forks
- 1.3k
- Avg merge
- 4h 24m
- Merged PRs (30d)
- 574
Getting set up
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First steps
- Read the whole issue, then the project's contributing guide.
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- Open a pull request that references the issue number.
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