OpenAI: GPT-5.1-Codex
openai/gpt-5.1-codex
Context: 400,000In: $1.25/1MOut: $10.00/1MUpdated 2026-08-05
GPT-5.1-Codex is a specialized version of GPT-5.1 optimized for software engineering and coding workflows. It is designed for both interactive development sessions and long, independent execution of complex engineering tasks....
Intelligence
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Coding
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Agentic
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Metric profile
Trend over time
Intelligence
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Coding
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Agentic
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Only 1 snapshot so far (data refreshes daily) — the trend line appears after the 2nd snapshot.
Classic evals (curated from model cards)
OpenAI GPT — manually maintained, may lag releases
MMLU-Pro
79.6%
GPQA Diamond
81.5%
HumanEval
96.8%
MATH-500
93%
Design Arena (ELO by category)
| Category | ELO | Win rate | Rank |
|---|---|---|---|
| dataviz | 1205 | 51.4% | #45 |
| mobileapps | 1191 | 53.4% | #20 |
| gamedev | 1184 | 52.3% | #54 |
| website | 1184 | 56% | #64 |
| codecategories | 1180 | 55.3% | #61 |
| fullstack | 1086 | 44.5% | #25 |
| webapps | 1067 | 44.1% | #31 |