Claude Code on Google Cloud's Agent Platform changedgoogle-vertex-ai
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Upstream edited this page at 30 Sep 2026 03:05 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 30 Sep 2026 03:07 UTC.
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284284Claude Sonnet 5, Opus 4.6 and later, and Sonnet 4.6 support the [1M token context window](https://platform.claude.com/docs/en/build-with-claude/context-windows#context-window-sizes-by-model) on Google Cloud's Agent Platform. Sonnet 5 always runs with the 1M window, with no `[1m]` variant to select. For the other models, Claude Code automatically enables the extended context window when you select a 1M model variant.
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286The [setup wizard](#sign-in-with-agent-platform) offers a 1M context option when it pins models. To enable it for a manually pinned model instead, append `[1m]` to the model ID. See [Pin models for third-party deployments](/docs/en/model-config#pin-models-for-third-party-deployments) for details.
286The [setup wizard](#sign-in-with-agent-platform) offers a 1M context option when it pins models. To enable it for a manually pinned model instead, append `[1m]` to the model ID. See [Pin models for third-party deployments](/docs/en/model-config#pin-models-for-third-party-deployments) for details, including how to use the 1M window without changing the pin.
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288288## Troubleshooting
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