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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 5.2
The restricted twin of Fable 5.2. Access is through Anthropic's cyber and life sciences verification programs.
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.
Thimble
Open source Claude Code plugin that explains what an agent did, with visualizations in the terminal.
