Claude Code on Google Cloud's Agent Platform changedgoogle-vertex-ai
Nearest release: v2.1.280, published under an hour before upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 22 Sep 2026 16:28 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 28 Sep 2026 23:37 UTC.
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227227Claude Code uses these default models when no pinning variables are set:
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229| Model type | Default value |
230| :--------------- | :--------------------------- |
231| Primary model | `claude-opus-5-5` |
229| Model type | Default value |
230| :- | :- |
231| Primary model | `claude-opus-5-5` |
232232| Small/fast model | `claude-sonnet-4-5@20250929` |
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234234Background tasks such as session title generation use the small/fast model, normally a Haiku-class model. On Google Cloud's Agent Platform, Claude Code uses the default Sonnet model for background tasks because Haiku may not be enabled in every project or region. Two selections change which model carries them:
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