Skip to content
Not available in this workspace
OpenRouterOpenRouter
© 2026 OpenRouter, Inc

Product

  • Chat
  • Rankings
  • Benchmarks
  • Apps
  • Discover
  • Models
  • Collections
  • Providers
  • Pricing
  • Enterprise
  • Labs

Company

  • About
  • Blog
  • Careers
    Hiring
  • Privacy
  • Terms of Service
  • Support
  • Works With OR
  • Data

Developer

  • Documentation
  • API Reference
  • Developer Platform
  • Status

Connect

  • Discord
  • GitHub
  • LinkedIn
  • X
  • YouTube
Favicon for moonshotai

MoonshotAI: Kimi K2 Thinking

moonshotai/kimi-k2-thinking

Model weights
Compare

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

Compare
ProvidersPricingPerformanceUptimeBenchmarksAppsActivityFAQ

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).

Pricing

The average price customers actually pay for this model, next to the prices providers post. Caching and discounts mean the price actually paid is often well below the listed one.

Performance

Throughput is how fast the model writes (tokens per second — higher is better). Latency is total round-trip time (lower is better). TTFT is time-to-first-token — how long before you see anything appear (lower is better).

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.

Benchmarks

Scores on standardized evaluations. Higher percentages are better — and rank percentile shows where this model lands among all models on OpenRouter.

Apps

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.

Activity

Token volume and request traffic to this model over time.

Quick Start

Drop-in code to call this model. OpenRouter's API is OpenAI-compatible — most SDKs work by just swapping the base URL. The only thing that changes between models is the model slug below.

About MoonshotAI: Kimi K2 Thinking

OpenRouter makes MoonshotAI: Kimi K2 Thinking available through a unified, OpenAI-compatible API using the model ID moonshotai/kimi-k2-thinking. Requests can be routed across 2 providers, including NovitaAI and Google Vertex, with automatic failover when an endpoint is unavailable.

MoonshotAI: Kimi K2 Thinking accepts text and returns text. It has a 262,144-token context window and a maximum output of 100,352 tokens.

On OpenRouter, MoonshotAI: 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. Effective pricing can be lower when prompt caching applies. It was released on November 6, 2025.

More models from MoonshotAI

  • Kimi K3
  • Kimi K2.7 Code
  • Kimi K2.6

Frequently asked questions

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.

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.

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

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

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.

Kimi K2 Thinking was released on November 6, 2025.

$0.60$2.50$0.151.36s41 tps
99.19%
$0.60$2.50--0.46s143 tps
99.71%

Throughput

143tok/s

P50, best across providers

Latency

0.46s

P50, best provider

AutoExacto Benchmarks
GPQA DiamondTAU-Bench
NovitaAI
89.1%72.6%
auto-routing
88.2%72.0%
Google Vertex
79.7%69.5%
Uptime (3d)

100.00%

Availability (3d)

98.99%

Availability over the last 3 days

Last 72 hours
Availability 98.99%
3 Days Ago2 Days AgoYesterdayNow

Availability over the last 24 hours

OpenRouter Availability
99.83%
Without Routing
97.37%

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.

1.
Favicon for https://pi.dev/
pi
There are many coding agents, but this one is yours.
1.45Btokens
2.
Favicon for https://nousresearch.com
Hermes Agent
Hermes Agent is an open-source, self-improving AI agent by Nous Research that runs persistently with memory across sessions, and builds reusable skills from experience. It comes with 40+ built-in tools, including web search, browser automation, and vision, plus scheduled automations and subagents.
671Mtokens
3.
Favicon for https://janitorai.com/
Janitor AI
Janitor AI is a chatbot platform where users create and chat with custom AI characters for interactive roleplay, storytelling, and immersive fiction.
546Mtokens
4.
Favicon for https://openclaw.ai/
OpenClaw
OpenClaw is an open-source AI agent that connects to your messaging apps and takes real actions on your behalf, from running commands and browsing the web to managing files and sending emails.
367Mtokens
5.
Favicon for https://claude.ai/apple-touch-icon.png
Claude Code
Claude Code is Anthropic's agentic coding tool that reads your entire codebase, plans and executes changes across files, runs tests, and iterates on failures, all from natural language prompts.
296Mtokens