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Sweep 30 Oct 2026 · 01:02Z Build v2.1.314 532 read Stable v2.1.308 Latest v2.1.314 Next v2.1.314 Feeds RSS JSON llms.txt llms-full.txt Unofficial
HomeDocsClaude Code CLI 29 Oct 2026
One change · claude-code

How Claude Code uses prompt caching changedprompt-caching

Nearest release: v2.1.314, published 4 hours after 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 29 Oct 2026 19:24 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 29 Oct 2026 19:37 UTC.

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9191On most models, changing the [effort level](https://code.claude.com/docs/en/model-config.md#adjust-effort-level) mid-session means the next request reads the entire conversation history with no cache hits. While the cache is still warm, Claude Code asks you to confirm the change first.
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93On Opus 5.5, Sonnet 5.5, Haiku 5.5, and Fable 5.1 with an API key or a Claude subscription, changing effort keeps the cache, and Claude Code applies the new level without asking. This doesn't apply on Amazon Bedrock, Google Cloud's Agent Platform, or a [Claude apps gateway](https://code.claude.com/docs/en/claude-apps-gateway), or when you set [`CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS`](https://code.claude.com/docs/en/llm-gateway-protocol#disable-pre-release-capabilities) or your organization has a HIPAA configuration.
93On Opus 5.5, Sonnet 5.5, Haiku 5.5, and Fable 5.1 with an API key or a Claude subscription, you keep the cache when you change effort. Claude Code [applies the new level](https://code.claude.com/docs/en/model-config.md#when-a-new-effort-level-starts) without asking. On Amazon Bedrock, Google Cloud's Agent Platform, or a [Claude apps gateway](https://code.claude.com/docs/en/claude-apps-gateway), or when you set [`CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS`](https://code.claude.com/docs/en/llm-gateway-protocol#disable-pre-release-capabilities) or your organization has a HIPAA configuration, it works as on most models.
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9595Before v2.1.260, changing effort on Fable 5.1 with an API key or a Claude subscription also invalidated the cache.
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