Disclosure: I work on Modelflare , an OpenAI-compatible AI API gateway. The canonical version of this article lives on modelflare.dev .

Kimi K3.1 Pro is Moonshot AI's new flagship for coding, visual and 3D work, and multi-step research. Released on 23 October 2026, it combines a 3-trillion-class parameter scale , a 1,048,576-token context window , and an always-on reasoning mode. Its international API list price is $2 per million input tokens and $10 per million output tokens ; the Highspeed version costs $4 / $20 . This places the standard version alongside Claude Sonnet 5.5 on uncached input and output price, and at half Claude Opus 5.5's corresponding rates. Sources: official model list , Kimi pricing , and Claude pricing .

The interesting question is what those prices buy for a real workflow. This guide separates model specifications, API controls, published evaluations, and calculated token budgets.…