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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 2 Oct 2026
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Nearest release: v2.1.287, 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 2 Oct 2026 02:36 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 2 Oct 2026 02:37 UTC.

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First seen 14 Aug 2026 this site's first read of the page
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522522 </Accordion>
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524524 <Accordion title="Cost and latency">
525 The classifier runs on Claude Sonnet 5 by default rather than on your `/model` selection. A classifier model that Anthropic configures server-side takes precedence over that default. When your session's model is Claude Sonnet 4.6, or when [`availableModels`](/docs/en/model-config#restrict-model-selection) excludes Sonnet 5, the classifier runs on the session's model instead, or on an Opus model when the session runs on a [Fable model](/docs/en/model-config#work-with-fable); on providers other than the Anthropic API, that Opus fallback is the provider's default Opus model.
525 The classifier runs on Claude Sonnet 5 by default rather than on your `/model` selection. A classifier model that Anthropic configures server-side takes precedence over that default. When your session's model is Claude Sonnet 4.6, or when [`availableModels`](/docs/en/model-config#restrict-model-selection) excludes Sonnet 5, the classifier runs on the session's model instead, or on an Opus model when the session runs on a [Fable model](/docs/en/model-config#work-with-fable). On providers other than the Anthropic API, that Opus fallback is the model you set in [`ANTHROPIC_DEFAULT_OPUS_MODEL`](/docs/en/model-config#environment-variables), or Opus 5 if you haven't set one.
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527527 The session's first auto-mode request validates the Sonnet 5 default: if the request succeeds, Sonnet 5 stays the session's classifier model, and if it fails because the model isn't available, the session uses the fallback instead.
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