What is Composer 2.5?

Composer 2.5 is an AI model developed by Cursor, as described by Nathaniel Whittemore in May 2026. It is positioned as a cost-efficient alternative to leading models like Opus 4.7 and GPT-5.5, with comparable performance at significantly lower cost.

• May 2026 - Nathaniel Whittemore reported that Composer 2.5 scored 69.3% on Terminal Bench 2.0, just behind Opus 4.7.
• May 2026 - On SweBench multilingual, Composer 2.5 scored comparable to Opus 4.7 (80.5%) and GPT-5.5 (77.8%), per Whittemore.
• May 2026 - Whittemore noted that Composer 2.5 performed comparably to Opus 4.7 and GPT-5.5, slightly ahead on medium settings and slightly behind on extra high and max settings, but at 10 to 60x lower cost.
• May 2026 - According to Whittemore, Cursor claims their model is 10x more efficient compared to similarly capable models.