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Mellum2.1-12B-A2.5B-Thinking

Mellum2.1 is the next version of Mellum2 Thinking.

text → text · made by JetBrains

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About

Mellum2.1-12B-A2.5B-Thinking — a text model from JetBrains.

It takes text and returns text. It was published in September 2026. The catalogue files it under reasoning. Its weights are published under APACHE-2.0, so you may run it on your own machine, or buy it from whoever serves it cheapest.

Every current figure

Maker
JetBrains
Register
model
Takes
text
Returns
text
Published
September 2026
Parameters
12 billion · read from its own weights
Licence
apache-2.0

Known as 1 name

JetBrains/Mellum2.1-12B-A2.5B-Thinking