AIHacker News3 days ago
Claude Fable 5.1 and Claude Mythos 5.1
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Anthropic introduced Claude Fable 5.1 and Claude Mythos 5.1, the same model with different safeguards. Fable 5.1 is generally available, costs about 25% less than Fable 5 for typical token-billed workloads, and reduces cybersecurity false positives by 60%. Mythos 5.1 is limited to trusted access programs.
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