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Mythos cryptographic weaknesses
Mythos Preview found new attacks on HAWK and a reduced AES. First-party research from Anthropic.
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.
Claude Fable 5.1
Anthropic's public Mythos-class model. Long-horizon coding and research, cheaper cache reads. Live everywhere today.
Fable 5.1 on Google Cloud
Fable 5.1 on Google Cloud Agent Platform. First-party from Google Cloud.
