Claude Mythos 5.2
by Anthropic · ID claude-mythos-5-2 · Released 2026-11 · Proprietary
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ELO Score
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MMLU
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HumanEval
1M
Context Window
$8.00
Input Price
About Claude Mythos 5.2
The same underlying model as Claude Fable 5.2, announced 9 November 2026, without some of Fable's cybersecurity and biology safeguards. Not open to everyone: organisations apply through Anthropic's Cyber Verification and Life Sciences Verification programmes, and Claude Enterprise customers can use it inside Claude Security. Same price as Fable 5.2, $8 input / $40 output per million tokens. Prices checked 10 November 2026. Not listed on the Arena text leaderboard as of 27 October 2026.
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