# Tagged jetbrains

> Announcements and real-world deployments of AI, checked against their sources and scored: open-weights releases, decision models in the wild, and what is actually in use.

- [JetBrains releases Mellum2.1 Thinking, a 12B coding MoE with 2.5B active, under Apache 2.0](https://shipped.anth.us/open-weights/jetbrains-mellum2-1-12b-a2-5b-thinking/index.md): Mellum2.1 Thinking is a 12B mixture-of-experts reasoning model with 2.5B active, retrained mostly with reinforcement learning on real repositories. (2026-09-20)