OpenAI: GPT-5.3-Codex
openai/gpt-5.3-codex
Context: 400,000In: $1.75/1MOut: $14.00/1MUpdated 2026-10-04
GPT-5.3-Codex is OpenAI’s most advanced agentic coding model, combining the frontier software engineering performance of GPT-5.2-Codex with the broader reasoning and professional knowledge capabilities of GPT-5.2. It achieves state-of-the-art results...
Intelligence
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Coding
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Agentic
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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 |
|---|---|---|---|
| gamedev | 1174 | 51.3% | #62 |
| dataviz | 1172 | 50.6% | #68 |
| website | 1169 | 48.6% | #74 |
| asciiart | 1162 | 51.2% | #38 |
| codecategories | 1151 | 47.2% | #75 |
| uicomponent | 1144 | 47.3% | #76 |
| svg | 1128 | 54% | #53 |
| godotgamedev | 1124 | 45.1% | #27 |
| androidnative | 1084 | 35.2% | #30 |
| mobileapps | 1051 | 41.4% | #44 |
| webapps | 1025 | 36.9% | #39 |
| 3d | 1023 | 35.3% | #101 |
| fullstack | 981 | 36.5% | #42 |