Cursor's Composer 2.0 appears to use Kimi 2.5 model based on API endpoint evidence

Cursor's recently released Composer 2.0 feature appears to be using Kimi 2.5 as its underlying model, according to network traffic analysis shared by developers.

Technical Evidence

Developer observations show that when using Composer 2.0, Cursor sends requests to the endpoint: accounts/anysphere/models/kimi-k2p5-rl-0317-s515-fast in its /chat/completions API calls. The model identifier clearly references Kimi 2.5 architecture.

Community Discussion

The discovery gained attention on social media, with Elon Musk commenting on the apparent use of Kimi 2.5. Screenshots reportedly show responses from Kimi team members including Yulun Du, though the authenticity of these hasn't been verified.

Licensing Implications

According to the source, the modified MIT license used by Kimi 2.5 requires minimal obligations from Cursor - primarily clear attribution that the implementation is based on Kimi 2.5. This suggests Cursor can use the model commercially with proper credit.