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Timeline
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
GPT-3.52026-05-02
GPT-5.5 fully solved TLO enterprise network simulation in 2 of 10 attempts
GPT-3.52026-05-02
GPT-5.5 scored 71.4% on AISI expert CTF tasks, matching Claude Mythos Preview
Claude Mythos Preview2026-05-02
Claude Mythos Preview scored 68.6% on AISI expert CTF tasks
Claude Mythos Preview2026-05-02
Claude Mythos Preview fully solved TLO enterprise network simulation in 3 of 10 attempts
GPT-3.52026-04-24
Early user review of GPT-5.5 in Codex highlights major improvements
GPT-3.52026-04-23
GPT-5.5 model family achieves leading position on Artificial Analysis Index for cost-performance
GPT-3.52026-04-23
OpenAI engineer reveals GPT-5.5 is a Blackwell-native model trained on Nvidia GB200/GB300 NVL72 systems.
Ecosystem
GPT-3.5
competes withGemini 3 Pro2 src
competes withGPT-5.31 src
competes withClaude Mythos1 src
competes withGemini Flash1 src
competes withComposer 21 src
competes withClaude 3.5 Opus1 src
Claude Mythos Preview
competes withClaude Opus 4.61 src
competes withGPT-3.51 src
usesMETR1 src
competes withGPT-5.31 src
competes withCodex 5.31 src
Benchmarks
enterprise network attack simulation
Claude Mythos Preview71.4