JetBrains Mellum 2.1: Open Coding Agent Model Explained

JetBrains released Mellum 2.1, an open coding-agent model whose SWE-bench score rose from 2% to 47% through reinforcement learning alone, with no architecture changes, according to byteiota. The report covers the model's benchmarks, deployment commands, and where it fits in an agent stack.

JetBrains Mellum 2.1 jumped from 2% to 47% on SWE-bench using RL alone — no architecture changes. Here is the breakdown, benchmarks, deployment commands, and where it slots into an agent stack. The post JetBrains Mellum 2.1: Open Coding Agent Model Explained appeared first on byteiota .