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

JetBrains' small open-weights coding MoE (Apache-2.0), 12B total and 2.5B active, for agentic coding.

  • JetBrains
  • Open weights
  • Released 20 Sep 2026

Official page

Where it ranks

  • –
    Coding
    Models · Local · no result on this task’s benchmarks yet

Facts

Vendor
JetBrains
Family
Mellum
Released
20 Sep 2026
Weights
Open: download and run it yourself
License
Apache-2.0
Parameters
12.1B (2.5B active)
GPU memory to run locally
~8 GB (4-bit ≈ 12.1 B × 0.57 GB + 1.5 GB ≈ 8 GB, estimate.)
Access
Free (open weights)
Last verified
19 Oct 2026

Price from huggingface.co, 19 Oct 2026.

Benchmark results

No public benchmark results recorded yet.

Where you can use it

No tracked tool lists this model yet; as open weights it runs in local runtimes.

Earlier versions

  • Mellum2 Thinking · —

Sources