Cursor Composer 2 vs OpenAI o3 — side-by-side specs.
Cursor Composer 2 | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | Mar 20 2026 | Apr 16 2025 |
| Model type | — | — |
| Open source | No | No |
| Specifications | ||
Parameters | — | — |
Context window | — | — |
| Benchmarks | ||
Multilingual coding SWE-Bench MultilingualLike SWE-Bench, but the coding problems span many programming languages, not just one. Tests how broadly the AI can code. Higher is better. | 73.7% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 52.2% | — |
Agentic terminal coding Terminal-Bench 2.0Can the AI work in a command-line terminal — running commands and finishing technical setup tasks the way a developer would? (Version 2.0 of the test.) Higher is better. | 61.7% | — |
| Timeline | ||
| Release gap | o3 shipped 338 days before Composer 2 | |
Composer 2 and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. o3 shipped 338 days before Composer 2, 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 2 and o3 don't publish scores on any of the same benchmarks.