Cognition introduces SWE-check, a fast RL-trained bug detection model for Windsurf

Cognition and Applied Compute RL-trained SWE-check, a specialized bug detection model for the Windsurf IDE. It matches frontier performance on in-distribution evals and is an order of magnitude faster with cheaper inference, though it trails frontier models on out-of-distribution evals (delta F1 0.29 versus 0.49 before training).

A preview is available in Windsurf Next, with a mainstream release planned.