# Leanstral 1.5

> Leanstral 1.5 is an open-weight language model from Mistral AI, released on 30 Jun 2026. It accepts text and images and generates text, with a 262K-token context window and up to 128K output tokens per response. Mistral AI has deprecated this model.

Source page: https://www.aimodel.directory/models/labs-leanstral-1-5-1
Last verified: 17 Oct 2026

## Specifications

- **Developer:** Mistral AI
- **Release date:** 30 Jun 2026 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Status:** Deprecated (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Weights:** Open weights (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Context window:** 262K (262,144 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Max output:** 128K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Input:** Text and images (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Reasoning mode:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/mistral/models/labs-leanstral-1-5-1.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|

## FAQ

### What is the context window of Leanstral 1.5?

Leanstral 1.5 has a context window of 262,144 tokens (262K) and can generate up to 128,000 tokens in a single response, according to models.dev.

### Is Leanstral 1.5 open source?

Leanstral 1.5 is an open-weight model. Check the license terms before commercial use.

### When was Leanstral 1.5 released?

Mistral AI released Leanstral 1.5 on 30 Jun 2026, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Leanstral 1.5", https://www.aimodel.directory/models/labs-leanstral-1-5-1