JetBrains open-sources Mellum 2.1, which outperformed Qwen 3.5-9B in LiveCodeBench tests.

Dynamic Insight Beating AI Flash News: JetBrains releases open-source programming model Mellum2.1. Compared to Mellum2 launched in June this year, the new version retains a total of 12 billion parameters, with only 2.5 billion activated per generation, but it is more adept at identifying code issues, modifying files, and verifying results. JetBrains did not alter the model architecture, primarily enhancing capabilities via reinforcement learning. The team executed millions of sandbox tasks acros

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