OpenAI
Previous full o-series reasoning model. Uses extended internal chain-of-thought before responding and remains strong at science and math, but later o3 and o4 releases are the newer frontier generation.
Previous full o-series reasoning model.
58.7
Quality Score
1350
Arena ELO
Undisclosed
Parameters
200K
Context
Use this section to answer one simple question first: how much outside evidence do we have that this model performs well? Structured benchmark scores appear first, then official provider evidence, then live arena signal.
This model has normalized benchmark rows, so scores here are directly comparable across benchmark sources.
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Dec 2024
Released
These are recent benchmark or leaderboard claims from official provider sources. They are useful for freshness and context, but they are not treated the same as normalized independent benchmark rows.
o1 Benchmark Update
Quality: 30.7/100 | Price: $26.25/M tokens | Output: 75.82 tok/s | MMLU: 0.841% | HumanEval: 0.679%
View sourceo1-2024-12-17 - Arena-Hard-Auto
Arena-Hard-Auto official Gemini-2.5 judged score 55.9 with CI -2.2/1.8
View sourcehttps://huggingface.co/agentica-org/DeepSWE-Preview - SWE-Bench Verified
SWE-Bench Verified resolved rate 58.8
View sourceo1 Benchmark Update
Quality: 30.7/100 | Price: $26.25/M tokens | Output: 81.187 tok/s | MMLU: 0.841% | HumanEval: 0.679%
View source1350
ELO Score
1347 - 1354
95% Confidence
+/-4 points
33.2K
Battles
May 21, 2026
Last Updated
1194
ELO Score
1183 - 1205
95% Confidence
+/-11 points
3.7K
Battles
May 21, 2026
Last Updated