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Cursor·May 18, 2026·v2.5·developer_tool
Composer 2.5
Composer 2.5 is Cursor's latest AI coding model — a substantial improvement over Composer 2 in intelligence and behavior. It excels at long-horizon agentic tasks, follows complex instructions more reliably, and introduces targeted RL with textual feedback and 25x more synthetic training tasks.
AI CodingLLMCursorAgentic CodingDeveloper ToolsRLCode Agent
overview
Composer 2.5 is Cursor's latest AI coding model — a substantial improvement over Composer 2 in intelligence and behavior. It excels at long-horizon agentic tasks, follows complex instructions more reliably, and introduces targeted RL with textual feedback and 25x more synthetic training tasks.
key features
- 01Targeted RL with textual feedback — localized training signal at specific trajectory points so the model learns which exact decision helped or hurt, not just the final reward
- 0225x more synthetic tasks than Composer 2 — including feature deletion, byte code reverse engineering, and complex multi-file refactors for continual intelligence scaling
- 03Sharded Muon optimizer with dual mesh HSDP — asynchronous distributed orthogonalization enabling 0.2s optimizer steps on the 1T parameter model
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