How much does Kimi K2 Thinking cost?

Kimi K2 Thinking costs $0.60/M input tokens and $2.50/M output tokens, with separate rates for Cache Read at $0.15/M tokens.

What is the context length of Kimi K2 Thinking?

Kimi K2 Thinking has a 262,144 token context window. It supports up to 100,352 completion tokens.

Does Kimi K2 Thinking support tool calling and structured outputs?

Yes. Kimi K2 Thinking accepts tools and tool_choice for function calling. It also supports structured outputs via a JSON schema in response_format.

Which providers serve Kimi K2 Thinking?

Kimi K2 Thinking is served by 2 providers on OpenRouter: NovitaAI and Google Vertex. Requests are routed to the best available provider, with automatic failover to the others, and you can pin or exclude providers with provider routing.

When was Kimi K2 Thinking released?

Kimi K2 Thinking was released on 2025-11-06.

MoonshotAI: Kimi K2 Thinking

Name: MoonshotAI: Kimi K2 Thinking
Author: moonshotai

moonshotai/kimi-k2-thinking

Model weights

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Kimi K2 Thinking is Moonshot AI’s most advanced open reasoning model to date, extending the K2 series into agentic, long-horizon reasoning. Built on the trillion-parameter Mixture-of-Experts (MoE) architecture introduced in Kimi K2, it activates 32 billion parameters per forward pass and supports 256 k-token context windows. The model is optimized for persistent step-by-step thought, dynamic tool invocation, and complex reasoning workflows that span hundreds of turns. It interleaves step-by-step reasoning with tool use, enabling autonomous research, coding, and writing that can persist for hundreds of sequential actions without drift.

It sets new open-source benchmarks on HLE, BrowseComp, SWE-Multilingual, and LiveCodeBench, while maintaining stable multi-agent behavior through 200–300 tool calls. Built on a large-scale MoE architecture with MuonClip optimization, it combines strong reasoning depth with high inference efficiency for demanding agentic and analytical tasks.

Modalities

In / Out Price

$0.60 / $2.50per 1M

Context

262K

Released

Nov 6, 2025

Providers

Different companies host the same model. OpenRouter routes your request to one of them based on the routing mode you pick — Balanced (price + speed), Nitro (fastest), or Exacto (highest tool-calling accuracy).

Latency / throughput


	$0.60	$2.50	$0.15	0.94s	39 tps	94.49%
	$0.60	$2.50	--	0.40s	111 tps	99.55%

Uptime

Uptime is the percentage of the past 3 days that at least one provider was responding to requests. Availability is the percentage of time that inference was successfully served. OpenRouter continuously monitors and uses the next-best provider when one returns an error.

Uptime (3d)

100.00%

Availability (3d)

98.83%

Availability over the last 3 days

Last 72 hours

Availability 98.83%

3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability

97.32%

Without Routing

90.33%

When an error occurs in an upstream provider, we can recover by routing to another healthy provider, if your request filters allow it. You can access per-provider uptime data programmatically through the Endpoints API. Learn more about our load balancing and customization options.

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Public apps that send the most traffic to this model. Good signal for what real production workloads look like — and a hint at which use cases this model is best suited for.

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