# Kimi K3 Fast API Pricing

As of October 10, 2026, Kimi K3 Fast costs $4.50 per 1M input tokens and $22.50 per 1M output tokens on Fireworks AI, with cache reads at $0.45 per 1M tokens. It has a 1,048,576-token context window and returns up to 131,072 tokens per response.

- Page: https://models.litellm.ai/models/kimi-k3-fast
- Lab: Moonshot AI
- LiteLLM model name: `fireworks_ai/kimi-k3-fast`
- Context window: 1,048,576 tokens
- Max output: 131,072 tokens
- Added to LiteLLM: August 20, 2026
- Prices updated: October 10, 2026

## Pricing by provider

Token prices in USD per 1M tokens.

| Provider | Model name | Input | Output | Cache read | Per image | Per second | Context |
|---|---|---|---|---|---|---|---|
| Fireworks AI | `fireworks_ai/kimi-k3-fast` | $4.50 | $22.50 | $0.45 | – | – | 1M |
| Fireworks AI | `fireworks_ai/accounts/fireworks/routers/kimi-k3-fast` | $4.50 | $22.50 | $0.45 | – | – | 1M |

## Cost examples

1,000 requests with 2,000 input and 500 output tokens each:

- Fireworks AI: $20.25

100 long-document requests with 100,000 input and 2,000 output tokens each:

- Fireworks AI: $49.50

## Features

Supported: Function calling, Structured output, Image input, Reasoning.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="fireworks_ai/kimi-k3-fast",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## FAQ

### How much does Kimi K3 Fast cost?

Kimi K3 Fast costs $4.50 per 1M input tokens and $22.50 per 1M output tokens on Fireworks AI, with cache reads at $0.45 per 1M tokens.

### What is the context window of Kimi K3 Fast?

Kimi K3 Fast has a 1,048,576-token context window and returns up to 131,072 tokens per response.

### Which providers offer Kimi K3 Fast?

Kimi K3 Fast is available from Fireworks AI through LiteLLM, using the model name fireworks_ai/kimi-k3-fast.

### How do I call Kimi K3 Fast with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="fireworks_ai/kimi-k3-fast", or add the model to the LiteLLM proxy's config.yaml and send requests to /v1/chat/completions from any OpenAI client. LiteLLM tracks the cost of every request at the prices on this page.

### What features does Kimi K3 Fast support?

Kimi K3 Fast supports function calling, structured output, image input and reasoning.

### When did LiteLLM add Kimi K3 Fast?

Kimi K3 Fast was added to LiteLLM's model price file on August 20, 2026.

Source: LiteLLM model price file, https://github.com/BerriAI/litellm/blob/main/model_prices_and_context_window.json