Claude Mythos 5.2

• Nov 9, 2026

  Anthropic releases Claude Fable 5.2 and Claude Mythos 5.2, and cuts Fable's price 20%

Same model as Claude Fable 5.2 with fewer safeguards. Anthropic's model page (platform.claude.com/docs/en/models/mythos-5-2/overview) says it is available only to organisations verified through its verification programs, with the same specs and pricing as Fable 5.2 (1M context, 128K output, $8/$40, cache reads $0.20, June 2026 knowledge cutoff); the launch post adds that Claude Enterprise customers can use it through Claude Security without verification, and Mythos fast mode is limited to verified organisations. Ids: claude-mythos-5-2 (Claude API, Google Cloud, Foundry), anthropic.claude-mythos-5-2 (Bedrock). Benchmarks stay null: the system card reports Mythos 5.2 only on untracked suites (CVE Rediscovery 89.6%, CyScenarioBench 76.3%, De Novo Binder Design 85.1%, all without safeguards) and gives Fable 5.2's tracked scores under Fable's name, so they aren't copied across. Retirement is 'not sooner than November 9, 2027', a floor. predecessorId is null: Anthropic gives a migration path from Mythos 5.1 but no replacement statement, and Mythos 5.1 isn't tracked. The launch table gives Mythos 5.2 75.3% on Terminal-Bench-Science 0.1 (Fable 5.2 74.6%), also untracked.