Composer vs o3
Cursor Composer | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | Oct 29 2025 | Apr 16 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. | — | 26% |
| Timeline | ||
| Release gap | o3 shipped 196 days before Composer | |
Which is better: Composer or o3?
Composer and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 196 days before Composer, 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 and o3 don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer was released by Cursor on Oct 29 2025.
o3 was released by OpenAI on Apr 16 2025.