About Kimi K3.1 Pro
Kimi K3.1 Pro is Moonshot AI's post-trained upgrade of Kimi K3, a Mixture-of-Experts model with a 1M-token context window aimed at agentic coding, terminal work, and long-horizon tool use.
The model always thinks before answering and returns its reasoning alongside the response, with a reasoning effort of low, high, or max. It calls tools with strict JSON schema output and understands images and video, which suits coding agents that read screenshots, multi-step research, and whole-repository work. Moonshot is publishing open weights for the model.
| Metric | Value |
|---|---|
| Parameter Count | Unknown |
| Mixture of Experts | Yes |
| Context Length | 1,048,576 tokens |
| Multilingual | Yes |
| Quantized* | Unknown |
*Quantization is specific to the inference provider and the model may be offered with different quantization levels by other providers.
Ready to build with Kimi K3.1 Pro?
Try Kimi K3.1 Pro in the Workbench to prompt it, compare outputs, and iterate on prompts without writing any code. When you're ready to ship, call the same model from our API and build your own apps on top of it.
curl -sSf -X POST https://hub.oxen.ai/api/ai/chat/completions \
-H "Content-Type: application/json" \
-H "Authorization: Bearer $OXEN_API_KEY" \
-d '{
"model": "kimi-k3-1-pro",
"messages": [
{
"role": "user",
"content": "Try sending a message."
}
]
}'API endpoint
See the API reference for request and response formats.
https://hub.oxen.ai/api/ai/chat/completions