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Mellum2-12B-A2.5B-Thinking

Mellum 2 Thinking is a post-trained reasoning-augmented assistant model trained by JetBrains.

text → text · made by JetBrains

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About

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

It takes text and returns text. It was published in May 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
May 2026
Parameters
12 billion · read from its own weights
Licence
apache-2.0

Known as 1 name

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