# JetBrains: what I've logged

> JetBrains comes up in 2 posts of my AI log, from October 2026 to October 2026, and each item below links to the primary source. The releases I logged include Mellum2.1 Thinking, filed under frontier, open weights and image, video, world.

## Items

1. **Coding-Agent Benchmarks Should Match Their Users' Task Flows** (JetBrains, 12 Oct 2026): Built from 4,782 real IDE agent sessions. Multi-step solving roughly doubled agent cost with no stable change in resolve rate. [Primary source](https://huggingface.co/papers/2610.09633) · [Post](https://heyaliasif.com/ai/2026-10-13-muse-wonder-self-replication-radar#item-8)
2. **Mellum2.1 Thinking** (JetBrains, 5 Oct 2026): A 12B open coding model with 2.5B active parameters whose repository-level reinforcement learning lifts SWE-bench Verified from 2.0 to 47.0. [Primary source](https://huggingface.co/JetBrains/Mellum2.1-12B-A2.5B-Thinking) · [Post](https://heyaliasif.com/ai/2026-10-05-week-in-ai#item-10)

## Posts

- 2026-10-13 [Muse Wonder ships without scores, Anthropic tests self-copying](https://heyaliasif.com/ai/2026-10-13-muse-wonder-self-replication-radar)
- 2026-10-05 [Mistral Large 4, Claude Haiku 5.5 and a wave of decision models](https://heyaliasif.com/ai/2026-10-05-week-in-ai)

Canonical: https://heyaliasif.com/ai/topics/jetbrains