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Jamba 1.5

AI21 LabsOpen WeightsPending Human Review

Jamba 1.5 is an AI21 language-model release. Jamba 1.5 introduces instruction-tuned Mini and Large tiers for grounded enterprise conversation and tool workflows. It retains the hybrid state-space/attention structure and long context, while downloadable weights use AI21’s custom license rather than the original base model’s Apache license. Long context does not guarantee complete retrieval or factual correctness, and deployed throughput depends on hardware, precision, and prompt length.

2024-08-22
Mini 52B/12B active; Large 398B/94B active
Hybrid Mamba state-space / Transformer; MoE in larger tiers
Jamba Open Model License

Specifications

Parameters
Mini 52B/12B active; Large 398B/94B active
Architecture
Hybrid Mamba state-space / Transformer; MoE in larger tiers
License
Jamba Open Model License
Context Window
262,144 tokens
Type
text
Modalities
text

Benchmark Scores

Advanced Specifications

Model Family
Jamba
API Access
Available
Chat Interface
Not Available
Variants
MiniLarge

Capabilities & Limitations

Capabilities
text generationlong contextinstruction following
Known Limitations
Long-input quality requires task evaluationLicense and weight footprint vary by tier
Notable Use Cases
enterprise question answeringdocument assistantsprivate deployment

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