Anthropic Mythos outperforms GPT-5.5 in cybersecurity tests by 2026

Anthropic's Mythos model will demonstrate superior cybersecurity capabilities over GPT-5.5 in third-party benchmarking tests conducted by the U.K. AI Security Institute or similar entities. The margin of superiority will exceed the 20% difference observed in the current 3 out of 10 vs. 2 out of 10 success rate in simulated cyberattacks.

Implied probability (Yes)

60%