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MoonshotAI · Language model

Kimi K2 Thinking

moonshotai/kimi-k2-thinking
  • Language
Released 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...

Specifications

Context window
262,144 tokens
Max output
98,304 tokens
Input
text
Output
text
Reasoning
always on
Tokenizer
Other

Supported parameters

Accepted by the model and forwarded as-is by the gateway.

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

Use it

POST /api/v1/chat/completions · MCP chat · full reference

curl https://omnirail.org/api/v1/chat/completions \
  -H "Authorization: Bearer $OMNIRAIL_KEY" -H "Content-Type: application/json" \
  -d '{"model":"moonshotai/kimi-k2-thinking","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'