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JetBrains releases Mellum2.1 open coding model

JetBrains released Mellum2.1, a 12-billion-parameter mixture-of-experts model with 2.5 billion active parameters for coding agents and self-hosted use. Its original release says the weights are on Hugging Face under Apache 2.0. JetBrains says its reinforcement learning improved repository work and speed, while GGUF builds and a multi-token prediction head are still planned.

JetBrains

Mellum2.1

Models

Published (date only)

1 source

Primary source · October 8, 2026

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