# Labs Leanstral 1.5.1 API Pricing

As of October 10, 2026, Labs Leanstral 1.5.1 is free to use on Mistral AI. It has a 262,144-token context window and returns up to 131,072 tokens per response.

- Page: https://models.litellm.ai/models/labs-leanstral-1-5-1
- LiteLLM model name: `mistral/labs-leanstral-1-5-1`
- Context window: 262,144 tokens
- Max output: 131,072 tokens
- Added to LiteLLM: August 29, 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 |
|---|---|---|---|---|---|---|---|
| Mistral AI | `mistral/labs-leanstral-1-5-1` | $0 | $0 | – | – | – | 256K |

## Cost examples

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

- Mistral AI: $0

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

- Mistral AI: $0

## Features

Supported: Function calling, Structured output.

## Use it with LiteLLM

```python
from litellm import completion

response = completion(
    model="mistral/labs-leanstral-1-5-1",
    messages=[{"role": "user", "content": "Hello!"}],
)
```

## FAQ

### How much does Labs Leanstral 1.5.1 cost?

Labs Leanstral 1.5.1 is free to use on Mistral AI.

### What is the context window of Labs Leanstral 1.5.1?

Labs Leanstral 1.5.1 has a 262,144-token context window and returns up to 131,072 tokens per response.

### Which providers offer Labs Leanstral 1.5.1?

Labs Leanstral 1.5.1 is available from Mistral AI through LiteLLM, using the model name mistral/labs-leanstral-1-5-1.

### How do I call Labs Leanstral 1.5.1 with an OpenAI-compatible API?

Use the LiteLLM Python SDK with model="mistral/labs-leanstral-1-5-1", 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 Labs Leanstral 1.5.1 support?

Labs Leanstral 1.5.1 supports function calling and structured output.

### When did LiteLLM add Labs Leanstral 1.5.1?

Labs Leanstral 1.5.1 was added to LiteLLM's model price file on August 29, 2026.

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