Cursor Composer 2.5 vs OpenAI o3 — side-by-side specs.
Cursor Composer 2.5 | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | May 18 2026 | Apr 16 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Science reasoning GPQA Diamond | — | — |
Software engineering SWE-Bench Verified | — | — |
Multimodal understanding MMMU | — | — |
| Timeline | ||
| Release gap | o3 shipped 397 days before Composer 2.5 | |
Composer 2.5 and o3 do not have directly comparable benchmark scores published on GPQA Diamond, SWE-Bench Verified, or MMMU. o3 shipped 397 days before Composer 2.5, 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 — at least one of these models has not published scores on GPQA Diamond, SWE-Bench Verified, or MMMU.