We ran Composer 2.5 and 2.5 Fast across 11 skills. Surprisingly, Fast won.

Cursor just shipped Composer 2.5 and Composer 2.5 Fast. We benchmarked both across 11 engineering skills, 5 scenarios per skill, averaged across three independent LLM judges. The fast model scored higher, ran 32% quicker, and costs exactly the same. If you are reaching for Composer 2.5 over Composer 2.5 Fast, you are paying the same price for a slower, slightly worse model.

Here is the full picture.

TL;DR

Composer 2.5 Fast scores 92.7% with skill context. Composer 2.5 scores 92.1%. Fast wins.

Both are ahead of gpt-5.5, gpt-5.4, and the previous Composer 2.