Jamba2

• AI21's own announcement introduces Jamba2, released under Apache 2.0 and available through AI21 Studio and Hugging Face.
• This catalogue holds zero AI21 rows. That is a fact about the registry it reads, not a judgement about the model: OpenRouter carries no AI21 model at all as of 2026-09-04.
• Open weights are not the same as a purchasable API row. The self-host page prices open-weight models against real hardware where a parameter count is sourced; it holds no Jamba2 profile, so it makes no claim about one.

Look at these instead

• mistralai/mistral-small-2603
• microsoft/phi-4
• google/gemma-4-31b-it

Sources

• AI21, Introducing Jamba2
• OpenRouter model list