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Kimi K2 Thinking

Moonshot AIReleased Nov 6, 2025

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...

Try in playground
Context window
262K tokens
Max output
100K tokens
Input
text
Output
text
Tokenizer
Other
Released
Nov 6, 2025
Reasoning
always on

Pricing

Per 1M tokens. The provider price and our flat 3% fee are separate columns — what you pay is their sum.

Per 1M tokensProvider+ 3% feeYou pay
Input$0.600$0.018$0.618
Output$2.50$0.075$2.58
Cache read$0.150$0.0045$0.154

Benchmarks

Artificial Analysis

Intelligence index
17.3
Coding index
21
Agentic index
1.8

Design Arena

CategoryEloWin rateRank
Websitesmodels115648.8%#70

Head-to-head preference voting. How we filter and rank

Supported parameters

  • frequency_penalty
  • include_reasoning
  • logprobs
  • max_tokens
  • presence_penalty
  • reasoning
  • repetition_penalty
  • response_format
  • seed
  • stop
  • structured_outputs
  • temperature
  • tool_choice
  • tools
  • top_k
  • top_logprobs
  • top_p

Call it

OpenAI-compatible: point your SDK at api.openkey.ai/v1 and use model moonshotai/kimi-k2-thinking.

Code sample language
curl https://api.openkey.ai/v1/chat/completions \
  -H "Authorization: Bearer $OPENKEY_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "moonshotai/kimi-k2-thinking",
    "messages": [{"role": "user", "content": "Hello"}]
  }'
import os
from openai import OpenAI

client = OpenAI(
    base_url="https://api.openkey.ai/v1",
    api_key=os.environ["OPENKEY_API_KEY"],
)

completion = client.chat.completions.create(
    model="moonshotai/kimi-k2-thinking",
    messages=[{"role": "user", "content": "Hello"}],
)
print(completion.choices[0].message.content)
import OpenAI from "openai";

const client = new OpenAI({
  baseURL: "https://api.openkey.ai/v1",
  apiKey: process.env.OPENKEY_API_KEY,
});

const completion = await client.chat.completions.create({
  model: "moonshotai/kimi-k2-thinking",
  messages: [{ role: "user", content: "Hello" }],
});
console.log(completion.choices[0].message.content);

Questions

How much does Kimi K2 Thinking cost via API?
Through OpenKey, Kimi K2 Thinking costs $0.618 per 1M input tokens and $2.58 per 1M output tokens. That is the provider price ($0.600 / $2.50) plus a flat 3% fee — nothing else.
What is Kimi K2 Thinking's context window?
Kimi K2 Thinking accepts up to 262K tokens of context and returns up to 100K tokens per request.
Is Kimi K2 Thinking OpenAI-compatible?
Yes. Send requests to OpenKey's /v1/chat/completions endpoint with model "moonshotai/kimi-k2-thinking" using any OpenAI SDK — only the base URL and API key change.
What inputs does Kimi K2 Thinking support?
Kimi K2 Thinking accepts text input and produces text output.

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