OpenAI: GPT-5.1-Codex
openai/gpt-5.1-codex
Context: 400,000In: $1.25/1MOut: $10.00/1MUpdated 2026-10-04
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
—
Coding
—
Agentic
—
Metric profile
Trend over time
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 |
|---|---|---|---|
| uicomponent | 1244 | 60% | #39 |
| dataviz | 1222 | 55.9% | #47 |
| mobileapps | 1191 | 53.4% | #18 |
| website | 1168 | 56.1% | #76 |
| codecategories | 1158 | 54.6% | #73 |
| gamedev | 1151 | 50.5% | #70 |
| fullstack | 1086 | 44.5% | #30 |
| webapps | 1011 | 44% | #40 |