Kimi K3.1 Pro Models Reject Requests With Thinking Disabled

Kimi's K3.1 Pro models, identified as k3.1-pro and k3.1-pro-highspeed on Kimi Code, support only thinking mode, according to the product's model documentation published 23 October 2026. Requests with thinking disabled are rejected. Integrators who toggled reasoning off per request must remove that parameter or expect errors.