Anthropic has released Claude Fable 5.1, a generally available successor to Claude Fable 5 that is live in Claude Code and on the Claude Platform at the same $10 per million input tokens and $50 per million output tokens, with prompt-cache reads cut 75% to $0.25 per million tokens. The company also introduced Claude Mythos 5.1, which it describes as the same underlying model with more permissive safeguards, limited to trusted-access programs for cybersecurity and life-sciences work.
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