MoonshotAI: Kimi K2 Thinking

Kimi K2 Thinking is a text-only reasoning model from MoonshotAI with a 262,144-token context window that matches its maximum completion length, meaning it can sustain long chain-of-thought outputs across extended inputs. It supports tool use and reasoning natively, though structured output support is unconfirmed. There is no open-weights release, and it is a paid API product. At $0.60 per million input tokens and $2.50 per million output tokens, the pricing sits in a competitive mid-range tier for reasoning-class models. The practical catch is that benchmark coverage is currently zero, so there is no independent performance data to consult. Buyers who need a long-context reasoning model with tool use and are willing to run their own evaluations may find it worth testing, but teams that rely on third-party benchmarks before committing a budget should wait until comparative data becomes available.