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Jamba 1.5

AI21 Labs ·

Verified

3 of 3 published values traced to a source2 primary sources, 2 archived

Why this status

Every value this record asserts — date (August 22, 2024), context window (256K) and parameter count (398B) — was found in an archived primary source, checked 2026-08-10. Capabilities evidenced from the primary sources: tool_use: “5-Large" , use_mamba_kernels= False ) Model features Tool use with Jamba Jamba 1.”.

What these states mean · How records are judged · Has this record changed?

AI21's hybrid SSM-Transformer models with a 256K context window for long-document work.

agentictool useopen-weightslong-context

Details

ReleasedAugust 22, 2024
stated in ai21.com, huggingface.co

Jamba 1.5 was released on August 22, 2024.

CompanyAI21 Labs
FamilyJamba
EraMultimodal & open weights
TypeLanguage model · LLM
ModalitiesNot recorded
CapabilitiesAgentic, Tool use
WeightsOpen weights
LicenceJamba Open Model License
Context window256K tokens
stated in ai21.com, huggingface.co

Jamba 1.5 supports a context window of 256,000 tokens.

Parameters398B
stated in huggingface.co

Jamba 1.5 has 398,000,000,000 parameters.

Current information, elsewhere

This record is a historical one: every figure above is traced to a dated primary source. For what is true today — live pricing, current rankings, availability — these are better maintained than anything here could be.

Sources

Record status: verified · confidence 90/100 · 2 of 2 primary

Every value this record asserts — date (August 22, 2024), context window (256K) and parameter count (398B) — was found in an archived primary source, checked 2026-08-10. Capabilities evidenced from the primary sources: tool_use: “5-Large" , use_mamba_kernels= False ) Model features Tool use with Jamba Jamba 1.”.

Primary means published by the organisation that made the model. Verified records require at least one.

Jamba family

  1. Jamba 1.5 August 22, 2024

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