Claude Fable 5 and Mythos 5 released

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  Claude Opus 5.5 releasedSeptember 22, 2026 · Release
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  Claude Fable 5.1 and Mythos 5.1 releasedSeptember 1, 2026 · Release
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  Anthropic status: elevated errors on requests to multiple modelsAugust 20, 2026 · Official incident
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  Anthropic status: degraded performance for Claude Opus 5 and Haiku 4.5August 19, 2026 · Official incident
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  Anthropic status: degraded performance for multiple modelsAugust 18, 2026 · Official incident
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  Anthropic status: degraded performance for Claude Opus 5 and Sonnet 5August 17, 2026 · Official incident

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