Jamba Mini 1.5
Jamba Mini 1.5 combines Mamba and attention with a mixture-of-experts network. It has 52 billion total parameters and 12 billion active parameters.
Deprecated API; check access details
Capabilities added for business tasks
The instruction-tuned release supports function calls, structured JSON output and responses grounded in supplied text. Its card lists nine supported languages, including Arabic and Hebrew.AI21-Jamba-Mini-1.5 official model card
Quantizing experts changes the hardware requirement
AI21's ExpertsInt8 instructions describe running Mini 1.5 on one 80 GB GPU. The card also describes a two-GPU setup for its full-context example.AI21-Jamba-Mini-1.5 official model card
Practical guidance. These are specific configurations. Account for input length, batch size and non-weight memory instead of treating a GPU count as a universal requirement.
Bedrock access is limited to its legacy period
Amazon Bedrock lists this model in us-east-1 as Legacy from 26 May 2026, with end of life on 26 November 2026. New customers cannot adopt Legacy models; continued access is subject to AWS rules.Amazon Bedrock lifecycle dates for legacy models
AI21's own dated endpoint was deprecated earlier. The public weight repository has a separate lifecycle.AI21 Jamba versions, aliases and API deprecations
Specifications & access
| Detail | Value and conditions |
|---|---|
| Status | Deprecated API; check access details |
| Launch date | |
| Access | Downloadable, API |
| Model identifiers | AI21-Jamba-Mini-1.5Jamba 1.5 Minijamba-mini-1.5-2024-08ai21.jamba-1-5-mini-v1:0 |
| Parameters | 52 billion total; 12 billion activeAI21-Jamba-Mini-1.5 official model card |
| Context | 256K tokens advertisedAI21-Jamba-Mini-1.5 official model card |
| Weight license | Jamba Open Model License; gated downloadAI21-Jamba-Mini-1.5 official model card |
| AI21 API deprecation | 6 May 2025AI21 Jamba versions, aliases and API deprecations |
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