# Moonshot AI Kimi K3.1 Pro API

> Kimi K3.1 Pro is Moonshot AI's flagship open-weight multimodal reasoning model, a post-trained successor to Kimi K3 with a 1M-token context window. It accepts text, image and video input and is built for long-horizon coding, agentic tool use and visual software work.

Source: https://www.sandbase.ai/models/moonshotai/kimi-k3.1-pro
API reference: https://www.sandbase.ai/models/moonshotai/kimi-k3.1-pro/docs

## Facts

- Provider: Moonshot AI
- Type: Language model
- Model ID: `moonshotai/kimi-k3.1-pro`
- Price: $2 per 1M input tokens, $10 per 1M output tokens
- Context window: 1M tokens, up to 131.1K output tokens
- Capabilities: chat, vision, reasoning, structured output, function calling
- Billing: pay per use from one SandBase balance; no provider account or subscription needed

## Call it

- Chat Completions API: `POST https://api.sandbase.ai/v1/chat/completions`

```bash
curl -X POST https://api.sandbase.ai/v1/chat/completions \
  -H "Authorization: Bearer $SANDBASE_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
  "model": "moonshotai/kimi-k3.1-pro",
  "messages": [
    {
      "role": "user",
      "content": "Hello"
    }
  ],
  "max_tokens": 2048
}'
```

## FAQ

### How do I call Moonshot AI Kimi K3.1 Pro through SandBase?

Create a SandBase API key, then send requests with the model ID "moonshotai/kimi-k3.1-pro" to Chat Completions API (/v1/chat/completions) at https://api.sandbase.ai. The request examples on this page show the exact payload.

### How much does Moonshot AI Kimi K3.1 Pro cost?

$2 per 1M input tokens and $10 per 1M output tokens, billed per request from your SandBase balance. Discounts, when available, are shown in the pricing on this page.

### What is the context window of Moonshot AI Kimi K3.1 Pro?

1M tokens of context, with up to 131.1K output tokens per response.

### Which features does Moonshot AI Kimi K3.1 Pro support?

Moonshot AI Kimi K3.1 Pro supports vision (image input), reasoning, function calling, structured output. See Specifications above for the full list.

### Do I need a separate Moonshot AI account?

No. One SandBase API key and balance gives you access to Moonshot AI Kimi K3.1 Pro and the other models in the catalog; you do not need to sign up with Moonshot AI separately.