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Timeline
Claude Mythos Preview2026-07-01
Anthropic restored Mythos access with a security deal after the vulnerability spike.
Claude Mythos Preview2026-06-12
Built 8 working exploits from Firefox and Windows kernel patches in ~12 hours; first exploit ready 18 days before patched Firefox 148 shipped
Claude Mythos Preview2026-06-04
METR found Claude Mythos Preview could work 16+ hours autonomously
Claude Mythos Preview2026-05-14
First AI model to clear all UK AISI cyberattack simulations
Claude Mythos Preview2026-05-09
Early snapshot achieves more than 2x time horizon of next best model on METR benchmark
Claude Mythos Preview2026-05-02
Claude Mythos Preview fully solved TLO enterprise network simulation in 3 of 10 attempts
GPT-5.32026-04-18
Achieved 78.5% score on SWE-Bench coding benchmark
GPT-5.32026-04-16
Observed autonomously optimizing an embedding model for Qualcomm NPU for three hours.
GPT-5.32026-03-26
Achieved 100% resident identification accuracy in a safety evaluation for a care home smart speaker system.
GPT-5.32026-03-07
Released as OpenAI's most capable frontier model with unified coding, reasoning, and computer operation capabilities
Ecosystem
Claude Mythos Preview
usesFirefox1 src
usesWindows1 src
competes withClaude Opus 4.61 src
competes withGPT-3.51 src
usesMETR1 src
competes withGPT-5.31 src
GPT-5.3
developed byOpenAI3 src
usesComputer Use1 src
competes withClaude Mythos Preview1 src
competes withGPT-Rosalind1 src
competes withClaude Opus 4.71 src
competes withGPT-3.51 src
Benchmarks
browsecomp
Claude Mythos Preview86.9
osworld-verified
Claude Mythos Preview79.6
enterprise network attack simulation
Claude Mythos Preview71.4