Composer 2 Technical Report
Composer 2 is a specialized model designed for agentic software engineering. The model demonstrates strong long-term planning and coding intelligence while maintaining the ability to efficiently solve problems for interactive use. The model is trained in two phases: first, continued pretraining to improve the model's knowledge and latent coding ability, followed by large-scale reinforcement learning to improve end-to-end coding performance through stronger reasoning, accurate multi-step execution, and coherence on long-horizon realistic coding problems. We develop infrastructure to support training in the same Cursor harness that is used by the deployed model, with equivalent tools and st...
| Authors | Cursor Research, :, Aaron Chan et al. |
|---|---|
| Primary category | cs.SE |
| Published | 25 March 2026 |
| Last updated at source | 26 March 2026 |
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