GPT-5.3-Codex vs o3-pro
OpenAI GPT-5.3-Codex | OpenAI o3-pro | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | Feb 5 2026 | Jun 10 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Nonsense detection BullshitBench v2Given a confidently-worded but nonsensical prompt, does the AI spot that it makes no sense and push back — instead of playing along and inventing an answer? The score is how often it clearly called out the nonsense. Higher is better. | 24% | — |
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 83% | — |
Community preference (code) Arena Elo (Code)Like the text arena, but people vote on which AI writes better code. The votes become a chess-style Elo rating on arena.ai. Higher is better. | 1406 | — |
| Timeline | ||
| Release gap | o3-pro shipped 240 days before GPT-5.3-Codex | |
Which is better: GPT-5.3-Codex or o3-pro?
GPT-5.3-Codex and o3-pro don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3-pro shipped 240 days before GPT-5.3-Codex, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — GPT-5.3-Codex and o3-pro don't publish scores on any of the same benchmarks.
Frequently asked questions
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
o3-pro was released by OpenAI on Jun 10 2025.
Other comparisons
GPT-5.3-Codex vs Claude Sonnet 5o3-pro vs Claude Sonnet 5GPT-5.3-Codex vs Gemini Omnio3-pro vs Gemini OmniGPT-5.3-Codex vs Muse Spark 1.1o3-pro vs Muse Spark 1.1GPT-5.3-Codex vs Grok 4.5o3-pro vs Grok 4.5GPT-5.3-Codex vs DeepSeek-V4-Proo3-pro vs DeepSeek-V4-ProGPT-5.3-Codex vs Mistral Medium 3.5o3-pro vs Mistral Medium 3.5