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Sweep 22 Oct 2026 · 04:32Z Build v2.1.308 527 read Stable v2.1.308 Latest v2.1.308 Next v2.1.308 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 1 Oct 2026
One change · claude-code

Model configuration changedmodel-config

Nearest release: v2.1.286, published 9 hours 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 1 Oct 2026 03:12 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 1 Oct 2026 03:37 UTC.

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474474### Fallback model chains
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476When the primary model is overloaded, unavailable, or returns another non-retryable server error, Claude Code can switch to a fallback model instead of failing the request. Authentication, billing, rate-limit, request-size, and transport errors, and a [denial by your organization's policy check](/docs/en/errors#automatic-retries), never trigger a switch; those follow their normal retry and error handling.
476When the primary model is overloaded, unavailable, or returns another non-retryable server error, Claude Code can switch to a fallback model instead of failing the request. Authentication, billing, rate-limit, request-size, and transport errors, and a [denial by your organization's policy check](/docs/en/errors#automatic-retries), never trigger a switch; those follow their normal retry and error handling. It does switch when [Amazon Bedrock](/docs/en/amazon-bedrock#when-a-model-is-disabled-mid-session) or [Google Cloud's Agent Platform](/docs/en/google-vertex-ai#when-a-model-is-disabled-mid-session) refuses a model your account can't invoke, which Claude Code treats as the model being unavailable rather than as an authentication error.
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478478Configure one or more fallback models and Claude Code tries them in order, showing a notice when it switches. The switch lasts for the current turn only, so your next message tries the primary model first again. Claude Code caps chains at three models after duplicate removal and ignores extra entries.
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