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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
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claude-fable-5-1 changedrelease-notes/system-prompts/claude-fable-5-1

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22title: Claude Fable 5.1 system prompts
33url: https://platform.claude.com/docs/en/release-notes/system-prompts/claude-fable-5-1
4description: See updates to the core system prompt for Claude Fable 5.1 on [claude.ai](https://claude.ai) and the [Claude iOS app](https://anthropic.com/ios) and [Claude Android app](https://anthropic.com/android).
4description: See updates to the core system prompt for Claude Fable 5.1 on [claude.ai](https://claude.ai), the [Claude iOS app](https://anthropic.com/ios), and the [Claude Android app](https://anthropic.com/android).
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77## September 1, 2026
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