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Claude Mythos 5.2
The restricted twin of Fable 5.2. Access is through Anthropic's cyber and life sciences verification programs.
Related builds
Claude Mythos 5.1
Same weights as Fable 5.1, fewer safeguards. Restricted to cyberdefenders and life scientists via trusted access.
Claude Security on Mythos 5
Claude Security scans now run on Mythos 5. Public beta for Claude Enterprise. First-party.
Mythos cryptographic weaknesses
Mythos Preview found new attacks on HAWK and a reduced AES. First-party research from Anthropic.
Claude Fable 5.2
Anthropic's public model for the hardest technical work. Up to 30% faster than Fable 5.1, and cheaper. Live on the Claude apps, Claude Code, and the major clouds.
