Kimi.ai confirms that Cursor's newly launched Composer 2 AI coding assistant is built on top of their Kimi-k2.5 model foundation. The integration was achieved through continued pretraining and high-compute reinforcement learning training via Fireworks AI's platform under a commercial partnership. This represents a notable example of open model ecosystem collaboration in the AI development tools space.
Background
Cursor is a popular AI-powered code editor that competes with tools like GitHub Copilot, while Kimi.ai is a Chinese AI company developing large language models. The AI coding assistant space is seeing increased competition and collaboration between proprietary and open-source model providers.
- Source
- Simon Willison
- Published
- Mar 21, 2026 at 04:29 AM
- Score
- 6.0 / 10