# Jamba Large

> Jamba Large is an open-weight language model from AI21 Labs, released on 1 Jul 2025. It accepts text and generates text, with a 256K-token context window and up to 4K output tokens per response. As of 4 Oct 2026, the lowest listed API price is $2 per million input tokens and $8 per million output tokens (AI21 Studio), across 1 provider we track.

Source page: https://www.aimodel.directory/models/jamba-large
Last verified: 4 Oct 2026

## Specifications

- **Developer:** AI21 Labs
- **Release date:** 1 Jul 2025 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Status:** Generally available (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Weights:** Open weights (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Context window:** 256K (256,000 tokens) (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Max output:** 4K tokens (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Knowledge cutoff:** 22 Aug 2024 (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Input:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Output:** Text (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Reasoning mode:** No (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Tool calling:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)
- **Structured output:** Yes (source: models.dev, https://github.com/sst/models.dev/blob/dev/providers/ai21/models/jamba-large.toml)

## API pricing (USD per 1M tokens)

| Provider | Input | Output | Cached input | Context |
|---|---|---|---|---|
| AI21 Studio | $2 | $8 | – | 256K |

## FAQ

### What is the context window of Jamba Large?

Jamba Large has a context window of 256,000 tokens (256K) and can generate up to 4,096 tokens in a single response, according to models.dev.

### How much does the Jamba Large API cost?

Through AI21 Studio, Jamba Large costs $2 per million input tokens and $8 per million output tokens. Prices last verified 4 Oct 2026.

### Is Jamba Large open source?

Jamba Large is an open-weight model. Check the license terms before commercial use.

### When was Jamba Large released?

AI21 Labs released Jamba Large on 1 Jul 2025, according to models.dev.

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Data licensed CC BY 4.0. Cite as: AI Model Directory, "Jamba Large", https://www.aimodel.directory/models/jamba-large