GPT-4o vs GPT-5.3-Codex
OpenAI GPT-4o | OpenAI GPT-5.3-Codex | |
|---|---|---|
| Overview | ||
| Company | OpenAI | OpenAI |
| Release date | May 13 2024 | Feb 5 2026 |
| 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. | 12% | 24%Best |
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 | GPT-4o shipped 633 days before GPT-5.3-Codex | |
Which is better: GPT-4o or GPT-5.3-Codex?
GPT-5.3-Codex leads GPT-4o on 1 of the 1 benchmark they both report (BullshitBench v2). GPT-4o shipped 633 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.
On BullshitBench v2, GPT-5.3-Codex leads at 24% vs GPT-4o at 12%.
Frequently asked questions
GPT-4o was released by OpenAI on May 13 2024.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
Other comparisons
GPT-4o vs Claude Sonnet 5GPT-5.3-Codex vs Claude Sonnet 5GPT-4o vs Gemini OmniGPT-5.3-Codex vs Gemini OmniGPT-4o vs Muse Spark 1.1GPT-5.3-Codex vs Muse Spark 1.1GPT-4o vs Grok 4.5GPT-5.3-Codex vs Grok 4.5GPT-4o vs DeepSeek-V4-ProGPT-5.3-Codex vs DeepSeek-V4-ProGPT-4o vs Mistral Medium 3.5GPT-5.3-Codex vs Mistral Medium 3.5