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Cursor's[1] changelog entry "Composer 2" is dated "Mar 19, 2026" and says "Composer 2 is now available in Cursor."- Inicio
- 19 mar 202690% DE CONFIANZAfuente
Cursor Composer 2 Released
Cursor releases Composer 2, its in-house coding model, priced at $0.50/M input and $2.50/M output tokens, scoring 61.7 on Terminal-Bench 2.0 and later acknowledged to be built on Moonshot's Kimi K2.5.
- Cursor released Composer 2 on 19 March 2026, describing frontier-level coding performance on challenging tasks[1]
- Standard pricing is $0.50 per million input and $2.50 per million output tokens; the Fast variant, made the default, costs $1.50 and $7.50[1]
- Cursor's blog reports CursorBench 61.3, Terminal-Bench 2.0 61.7 and SWE-bench Multilingual 73.7, up from Composer 1.5 at 44.2, 47.9 and 65.9, and credits its first continued-pretraining run plus long-horizon reinforcement learning on tasks needing hundreds of actions[1]
The Kimi base question
- Cursor did not name a base model at launch; a developer then found the ID kimi-k2p5-rl-0317-s515-fast in Cursor's API response less than two hours after the blog post[4]
- Lee Robinson said Composer 2 "started from an open-source base" with about 25% of final compute from the base and 75% from Cursor, and co-founder Aman Sanger called not naming it a miss; the split is Cursor's own claim[4]
- Kimi K2.5 is a trillion-parameter mixture-of-experts model under a modified MIT licence that requires products above $20 million monthly revenue or 100 million users to display "Kimi K2.5"; the interface showed only "Composer 2"[3]; Moonshot later called it an authorized commercial partnership via Fireworks AI[4]
- Cursor's maker Anysphere was later acquired by SpaceX, with the deal closing on 14 August 2026[2]