Jamba Models by AI21 Labs
Last refreshed 2026-04-15. Next refresh: weekly.
Details
About
The Jamba family of large language models, developed by AI21 Labs, features two primary models—Jamba 1.5 Mini and Jamba 1.5 Large. These models leverage a novel architecture that integrates Transformer and Mamba layers to optimize speed, memory efficiency, and overall quality 128. One standout feature is their extensive context window of 256K tokens, allowing for superior handling of tasks requiring long text inputs, such as document summarization and analytical tasks 34. The Jamba models exhibit unparalleled performance in their class, outperforming competitors across various benchmarks 23. These models also offer multilingual support, accommodating languages such as English, Spanish, French, Portuguese, and more 11. They are readily accessible via AI21 Studio and multiple cloud platforms 9.
Decision facts
- Best fit
- structured outputschatbot and role-playing use caseslong-context generation
- Capability starting point
- Jamba-Instruct with 256k context
- Lowest tracked input
- Jamba-Instruct · $0.5/1M · AI21 Studio
- Closest related family
- Jamba 1.7
Current Variants
Use-when guidance is based on each model's tracked capabilities, context window, release date, and replacement status.
| Model | Use when | Released | Signals | Status |
|---|---|---|---|---|
| Jamba-Instruct | Use when the workload needs 256k context. | 2024-05 | 256k context | Current |
| Jamba v0.1 | Use when the workload needs 256k context. | 2024-03 | 256k context | Current |
Release Timeline
2 release groupsSpecifications(2 models)
| Model | Released | Context | Parameters |
|---|---|---|---|
| Jamba-Instruct | 2024-05 | 256k | 52B (12B active) |
| Jamba v0.1 | 2024-03 | 256k | 52B (12B active) |
Available From(2 providers)
Pricing
| Model | Provider | Input / 1M | Output / 1M | Type |
|---|---|---|---|---|
| Jamba-Instruct | AI21 Studio | $0.5 | $0.7 | Serverless |
| Jamba-Instruct | Microsoft Foundry | $0.5 | $0.7 | Serverless |
