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Claude Mythos Preview Benchmarks: 93.9% SWE-bench, 97.6% USAMO — Every Score

Complete benchmark analysis of Claude Mythos Preview across coding, math, reasoning, cyber, and multimodal tasks. Head-to-head with GPT-5.4, Gemini 3.1 Pro, and Claude Opus 4.6.

Published April 7, 2026
12 min read
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What Is Claude Mythos Preview? Anthropic's Most Powerful AI Model Explained

Claude Mythos Preview is Anthropic's most capable frontier model, surpassing Opus 4.6 across all benchmarks. It scores 93.9% on SWE-bench Verified, 97.6% on USAMO, and finds real zero-day vulnerabilities — but Anthropic won't release it publicly.