Composer 1.5 vs GPT-5.3-Codex
Cursor Composer 1.5 | OpenAI GPT-5.3-Codex | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | Feb 8 2026 | 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. | — | 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. | 67% | 83%Best |
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-5.3-Codex shipped 3 days before Composer 1.5 | |
Which is better: Composer 1.5 or GPT-5.3-Codex?
GPT-5.3-Codex leads Composer 1.5 on 1 of the 1 benchmark they both report (Next.js Evals). GPT-5.3-Codex shipped 3 days before Composer 1.5, 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 Next.js Evals, GPT-5.3-Codex leads at 83% vs Composer 1.5 at 67%.
Frequently asked questions
Composer 1.5 was released by Cursor on Feb 8 2026.
GPT-5.3-Codex was released by OpenAI on Feb 5 2026.
GPT-5.3-Codex leads on Next.js Evals — Composer 1.5 67% vs GPT-5.3-Codex 83%.
Other comparisons
Composer 1.5 vs Claude Sonnet 5GPT-5.3-Codex vs Claude Sonnet 5Composer 1.5 vs Gemini OmniGPT-5.3-Codex vs Gemini OmniComposer 1.5 vs Muse Spark 1.1GPT-5.3-Codex vs Muse Spark 1.1Composer 1.5 vs Grok 4.5GPT-5.3-Codex vs Grok 4.5Composer 1.5 vs DeepSeek-V4-ProGPT-5.3-Codex vs DeepSeek-V4-ProComposer 1.5 vs Mistral Medium 3.5GPT-5.3-Codex vs Mistral Medium 3.5