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

JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP is a language model from JetBrains, first covered on 2 November 2026. It is available as open weights you can download and run (licence: Apache 2.0). Its context window is 131,072 tokens.

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Who makes JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP?
JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP is made by JetBrains. JetBrains news →
When was JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP released?
The first report of JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP's release that Digest AI covered was published on 2 November 2026. JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face →
What type of model is JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP?
JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP is a language model.
Are JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP's weights open?
Yes. JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP is released as open weights that can be downloaded and run, under the Apache 2.0 licence.
What is JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP's context window?
JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP's context window is 131,072 tokens.
Where is JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP available?
JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP is available as open weights that can be downloaded and run.

Taken from the coverage, not from our own testing. A question is left out when none of the reports we read gave the answer. All tracked models →

1 story about JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP

  1. JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face

    The 12 B mixture‑of‑experts model keeps the same architecture as the previous version—28 layers, 2.5 B active parameters, 64 experts (8 active per token), 131,072 token context length, and a 1,024‑token sliding…

    1 source primary source
    huggingface.co