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GPT-5.5 matches Claude Mythos in cyber attack tests, UK AI Security Institute finds

THE DECODER / 5/1/2026

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Key Points

  • The UK AI Security Institute reports that OpenAI’s GPT-5.5 can autonomously solve a full network attack simulation, marking it as the second model with this capability.
  • GPT-5.5’s results are nearly comparable to Anthropic’s Claude Mythos, though the latter remains available only to a limited group.
  • GPT-5.5 is already being shipped through ChatGPT and is available via API access, suggesting faster real-world availability of advanced autonomous capabilities.
  • The findings indicate rapid progress in AI systems’ ability to handle complex cybersecurity tasks, raising both operational interest and risk considerations.

OpenAI's GPT-5.5 is the second AI model capable of autonomously solving a full network attack simulation, according to the UK AI Security Institute. Its performance is nearly on par with Anthropic's Claude Mythos, which is still only available to a small group. GPT-5.5, meanwhile, is already shipping in ChatGPT and through the API.

The article GPT-5.5 matches Claude Mythos in cyber attack tests, UK AI Security Institute finds appeared first on The Decoder.

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