Cursor releases Composer 2.5, saying it's better at sustained work on long-running tasks and follows complex instructions more reliably; it's built on Kimi K2.5

Cursor just dropped Composer 2.5, and the company is calling it a substantial leap over its predecessor. The update targets two persistent pain points: sustaining performance on long-running tasks and reliably following complex instructions.

Under the hood, Composer 2.5 is built on Kimi K2.5. Cursor says the result is a meaningful improvement in both intelligence and behavior compared to Composer 2.

No incremental polish here. The jump from version 2 to 2.5 is framed as a significant upgrade rather than a minor iteration. The focus on sustained work suggests Cursor is going after workflows where previous versions would lose coherence or drift off-task midway through longer operations.

Details beyond the core claims remain thin. But for developers already embedded in Cursor's ecosystem, the update is live and available now.