Introducing Kimi K3.1 Pro
Moonshot promises full model weights by November 4; Kimi K3.1 Pro is currently available through its API.
Standard pricing is $2 per million input tokens and $10 per million output tokens. A Highspeed version offers 2–3× the speed at twice the price, with cached input pricing unchanged. Artificial Analysis scored it at 55, behind only Claude Opus 5.5 at 58 in the comparison Willison cites. Willison also tested SVG generation at its three supported reasoning levels—low, medium and max—and ran fresh comparisons against Kimi K3.
Simon Willison's note
Standard pricing is $2 per million input tokens and $10 per million output tokens. A Highspeed version offers 2–3× the speed at twice the price, with cached input pricing unchanged. Artificial Analysis scored it at 55, behind only Claude Opus 5.5 at 58 in the comparison Willison cites. Willison also tested SVG generation at its three supported reasoning levels—low, medium and max—and ran fresh comparisons against Kimi K3.
Simon Willison's note
score 8