Composer 2.5 vs o3
Cursor Composer 2.5 | OpenAI o3 | |
|---|---|---|
| Overview | ||
| Company | Cursor | OpenAI |
| Release date | May 18 2026 | 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% |
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. | 79.8% | — |
Agentic coding CursorBench v3.1Cursor's own test of harder, real-world coding tasks inside a code editor. Higher is better. | 63.2% | — |
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. | 92% | — |
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. | 69.3% | — |
| Timeline | ||
| Release gap | o3 shipped 397 days before Composer 2.5 | |
Which is better: Composer 2.5 or o3?
Composer 2.5 and o3 don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. 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 — Composer 2.5 and o3 don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 2.5 was released by Cursor on May 18 2026.
o3 was released by OpenAI on Apr 16 2025.