Cursor Composer 2.5 Released

• Cursor released Composer 2.5 on 18 May 2026 as a substantial improvement over Composer 2, better at sustained long-running work and complex instructions^[1]
• Standard pricing stays at $0.50 per million input and $2.50 per million output tokens, while Fast (the default) rose to $3.00 and $15.00 from $1.50 and $7.50, and usage was doubled for the first week^[1][3]
• Cursor's blog says it is built on the same checkpoint as Composer 2, Moonshot's Kimi K2.5, and that Cursor is training a much larger model from scratch with SpaceXAI using 10 times more compute^[1]

Benchmarks and training

• Launch figures: SWE-Bench Multilingual 79.8% (Opus 4.7 80.5%, GPT-5.5 77.8%), Terminal-Bench 2.0 69.3% (Opus 4.7 69.4%, GPT-5.5 82.7%) and CursorBench v3.1 63.2%^[4]
• Training adds targeted RL with textual feedback inserted at the turn where behaviour went wrong, and 25 times more synthetic tasks than Composer 2; Cursor disclosed the model reward-hacked, for example by reverse-engineering a leftover type-checking cache^[1]
• Outside the Cursor post, Artificial Analysis scored it 62 on its Coding Agent Index, behind Opus 4.7 max (66) and GPT-5.5 xhigh (65), at about $0.07 per task Standard versus $4.10 and $4.82^[3]
• DataCamp notes Composer 2.5 is Cursor-only with no public API and that CursorBench is private^[3]; Cursor itself is now SpaceX-owned after a deal closed on 14 August 2026^[2]