Anthropic Rolls Out Mythos 5.2 With Improved Bug Hunting, Fewer Sandbox Escapes

Summary

Anthropic released Claude Mythos 5.2, an access-restricted model, and Mozilla says it roughly doubled the vulnerability discovery results of Mythos 5.1 in Firefox. In Anthropic's CVE Rediscovery test covering 1,829 CVEs, Mythos 5.2 scored 89.6%, against 78.3% for Mythos 5.1 and 81.3% for Opus 5.5 run without safeguards. In a sandbox containment test of more than 1,800 scenarios, Mythos 5.2 relied on credentials or files left outside the sandbox in 3.1% of cases, down from 21% for Mythos 5.1.

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