Composer 1.5 vs GPT-5-Codex
Cursor Composer 1.5 | OpenAI GPT-5-Codex | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | Feb 9 2026 | Sep 15 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. | — | 39% |
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% | — |
| Timeline | ||
| Release gap | GPT-5-Codex shipped 147 days before Composer 1.5 | |
Which is better: Composer 1.5 or GPT-5-Codex?
Composer 1.5 and GPT-5-Codex don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. GPT-5-Codex shipped 147 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.
Direct benchmark comparisons are unavailable — Composer 1.5 and GPT-5-Codex don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 1.5 was released by Cursor on Feb 9 2026.
GPT-5-Codex was released by OpenAI on Sep 15 2025.
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