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GPT-5.3 Codex
OpenAI · proprietary · gpt-5.3-codex
GPT-5.3-Codex is OpenAI's most capable coding model, combining frontier agentic coding capabilities, improvements in aesthetics, and context compaction. It sets new state-of-the-art results on Terminal-Bench 2.0 (77.3%), OSWorld-Verified (64.7%), and SWE-Lancer IC Diamond (81.4%). First model classified as High capability for cybersecurity under OpenAI's Preparedness Framework. Available in the Codex app and API.
Not enough scores for a fingerprint yet.
Benchmark scores
| Benchmark | Score |
|---|---|
| SWE-Lancer (IC-Diamond subset) | 0.81 |
| Terminal-Bench 2.0 | 0.77 |
Pricing
- OpenAI$1.75 / $14.00
Input / output per 1M tokens
AA metrics
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Arena Elo
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