Disclaimer: This is not an official release by Anthropic. Mythos nano is an independent open model project. Mythos nano 🚨 This model was not trained on tool calling or agent based programming data. We therefore do not recommend using it for tasks that involve function calling, API orchestration, or autonomous coding agents. For programming tasks, we recommend using this model on competitive programming problems (e.g., LeetCode style) Weibo Lab. ⚠️ Abliterated (uncensored): the refusal direction has been removed, so this model will not decline requests a safety tuned model normally would. Safety guardrails are reduced — use responsibly and at your own risk; you are solely responsible for outputs and legal compliance. 🏆 Benchmarks Full comparison (mathematics · coding · knowledge · instruction) Model Params AIME25 AIME26 HMMT25 BruMO25 IMO Ans LCBv6 OJBench GPQA D IFEval IFBench Kimi K2.5 1T 96.1 93.3 95.4 98.3 81.8 85.0 54.7 87.6 93.9 70.0 GLM 5 744B 96.7 95.8 97.9 – 82.5 85.5 55.0 86.0 92.6 76.5 DeepSeek V3.2 671B 93.1 94.2 90.2 96.7 78.3 80.8 48.4 82.4 92.6 60.7 Gemini 3 Pro N/A 96.0 91.7 97.5 98.3 83.1 87.4 58.8 91.9 – 70.4 Claude Opus 4.5 N/A 92.8 95.1 92.9 – 78.5 84.8 – 87.0…
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