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May 2, 2026

UK AI Security Institute Finds GPT-5.5 Matches Claude Mythos in Autonomous Cyber Attack Capabilities

The UK AI Security Institute has determined that OpenAI's GPT-5.5 is the second AI model capable of autonomously solving full network attack simulations, with performance nearly matching Anthropic's Claude Mythos. Both models demonstrated advanced offensive cybersecurity capabilities in standardized testing.

May 2, 20261 source

GPT-5.4 stories

UK AI Security Institute Finds GPT-5.5 Matches Claude Mythos in Autonomous Cyber Attack Capabilities

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