Cursor Composer 2 Foundation Revealed as Kimi-k2.5 — Moonshot AI Confirms Model Partnership

Simon Willison·high signal

Moonshot AI publicly confirmed that Kimi-k2.5 provides the foundation model for Cursor's newly launched Composer 2, with Cursor adding continued pretraining on top. This cements Kimi as a serious Western deployment target and signals that Cursor is actively sourcing from non-Big-3 model providers — a notable shift in the coding tool model supply chain. Simon Willison flagged the disclosure as notable for its transparency.