Limitless: An AI Podcast Claude Mythos: Anthropic's Leak That's Too Dangerous to Release
Mar 31, 2026
A high-profile leak exposed a next-tier AI model and a simple misconfiguration that triggered cybersecurity alarms. Conversation centers on the model's surprising ability to find critical software vulnerabilities and the ethics of limiting access. Competitor developments, rumored massive models, and shifting market expectations round out the rapid-fire AI race discussion.
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Anthropic Leak Revealed Mythos And Capybara
- Anthropic leaked Claude Mythos and a new top tier called Capybara after a CMS config error exposed ~3,000 unpublished assets.
- Two security researchers found blog drafts naming Mythos as a Capybara-tier model that Anthropic later confirmed as their most capable build.
Mythos's Cybersecurity Strength Is A Release Risk
- Mythos reportedly outperforms Opus 4.6 across coding, academic reasoning, and cybersecurity benchmarks, raising unique misuse risks.
- The model's strength at discovering and exploiting vulnerabilities is a core reason Anthropic is cautious about public release.
Opus 4.6 Found 500 Bugs Humans Missed
- Ajaz recounts how Claude Opus 4.6 scanned popular open-source codebases and found 500 major security flaws that humans missed over decades.
- Anthropic now slow-releases Mythos to cybersecurity experts first to let defenders harden systems before wider distribution.