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Claude Fable 5

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Anthropic Claude Fable 5 OpenAI Claude Opus 5 Fable 5 Kimi K3

Tuesday, 1 September 2026

Anthropic launches Claude Fable 5.1 after inking $35B cloud deal with Lambda

SiliconANGLE 2 days ago 38 ● 3 sources

Anthropic launched Claude Fable 5.1 and Claude Mythos 5.1 as new large language models with different restrictions on sensitive cybersecurity and biology tasks. The release follows a $35 billion infrastructure lease deal with Lambda. Mythos 5.1 is limited to trusted organizations while Fable 5.1 is generally available, and Anthropic says improved prompt caching cuts typical workload costs by 25% (up to 45% for AI-agent-heavy apps).

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AI Infrastructure Anthropic Claude Fable 5

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