Anthropic Releases Claude Fable 5.1 And Mythos 5.1
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Anthropic Releases Claude Fable 5.1 And Mythos 5.1
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Summary Report
Anthropic releases Claude Fable 5.1 and Mythos 5.1: Fable 5.1 is broadly available with a 1M token context window and roughly half the cost of Fable 5, while Mythos 5.1 stays restricted to Project Glasswing.
- 01. Fable 5.1 solves agentic coding tasks at roughly half the cost of Fable 5, with a million token context window
- 02. Mythos 5.1 is restricted to vetted Project Glasswing users, with safety classifiers and fallback restrictions removed for approved participants
Anthropic has released Claude Fable 5.1 and Claude Mythos 5.1, aimed at coding and knowledge work. Fable 5.1 is broadly available with a 1M token context window, while Mythos 5.1 is restricted to vetted users in Project Glasswing.
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