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Jamba

AI21's hybrid Mamba-Transformer open models for long context

CuratedLanguage Models

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What it does

Jamba is AI21 Labs' family of language models that mix Mamba state-space layers with Transformer attention for long-context work. The current Jamba2 release (January 2026) has a 3B dense model and a Mini MoE model with 52B parameters (12B active), 256K context and Apache 2.0 weights on Hugging Face. They are also served through AI21 Studio.

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