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MoonshotAI · Language model

Kimi K3.1 Pro

moonshotai/kimi-k3.1-pro
  • Language
Released Oct 23, 2026

Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model and a post-trained successor to Kimi K3, with a 1M-token context window. It is built for long-horizon coding, 3D...

Specifications

Context window
1,048,576 tokens
Max output
943,718 tokens
Input
text, image, video
Output
text
Reasoning effort
max, high, low, none
Tokenizer
Other

Supported parameters

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

  • frequency_penalty
  • max_tokens
  • presence_penalty
  • reasoning
  • reasoning_effort
  • response_format
  • stop
  • structured_outputs
  • tool_choice
  • tools

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-k3.1-pro","messages":[{"role":"user","content":"Hello"}],"max_tokens":300}'