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RJ (@RJiOSDEV) on X

A tweet reporting JetBrains' Oct 8 release of Mellum2.1, an open-weights coding model under Apache 2.0. It has 12B total parameters with 2.5B active, which implies a mixture-of-experts design. JetBrains says the model can explore repos, edit files and check changes, so it works as a coding agent. The tweet asks whether developers would self-host a coding agent. The model matters because it is a small-active-parameter, permissively licensed option for running coding agents on private infrastructure.