Language model
Jamba Large
ai21
- Released
- July 1, 2025
- Data date
- September 26, 2026
Jamba Large 1.6 combines state-space and Transformer layers in AI21's hybrid architecture. Its 398 billion total parameters, 94 billion active, and 256K context come with grounded generation.
The model card documents quantized vLLM serving and already points to Jamba Large 1.7. Large 1.6 is clearly separate from that newer version. The card gives March 5, 2024 as its knowledge cutoff, which matters for time-sensitive applications.
Specifications and access
| Specification | Value and source |
|---|---|
| Weights | Open weightsSource |
| Access | APISource |
| Parameters | 398 billionSource |
| Active parameters | 94 billionSource |
| Context window | 256,000 tokensSource |
| Maximum output | 4,096 tokensSource |
| Knowledge Cutoff | August 2024Source |
| License | Jamba Open Model LicenseSource |
| Inputs | TextSource |
| Outputs | TextSource |
| Tool calling | YesSource |
Popularity
16.9 / 100
Sources and data date
| Type | Evidence and data date |
|---|---|
| Additional source | models.dev catalog (retrieved September 26, 2026) |
| Additional source | Hugging Face · AI21 Jamba Large 1.6 model card · Editorial description reviewed October 2, 2026 |
| Additional source | OpenRouter: Popularity index (derived), CC BY 4.0 |
| Additional source | Vercel AI Gateway: Popularity index (derived), CC BY 4.0 |
| Additional source | Creative Commons Attribution 4.0 |