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Quoting Anthropic Frontier Red Team

Simon Willison quotes Anthropic's Frontier Red Team report "GLM-5.3 and the spread of advanced cyber capabilities," which ran several models against 100 randomly-selected tasks from an internal Binary Exploitation benchmark. GLM-5.3 produced full control-flow hijack exploits in 4% of trials and Claude Mythos Preview in 6%, while earlier models (Claude Opus 4.6, GLM-5.2) succeeded in none — marking what Anthropic frames as a newly crossed capability threshold for AI-assisted exploit development.

TL;DR Anthropic's Frontier Red Team reports GLM-5.3 and Claude Mythos Preview newly capable of generating full control-flow hijack exploits on a binary exploitation benchmark, unlike prior model generations.
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Organisations named here

  • Anthropic Frontier Red Team
  • GLM-5.2

Technologies named here

  • GLM-5.3
  • internal Binary Exploitation benchmark
  • Claude Mythos Preview
  • Claude Opus 4.6
  • GLM 5.2
  • GLM
  • Claude
  • Opus 4.6

Techniques named here

  • Full control flow hijack

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