JetBrains AI

Trained from scratch and designed for practical deployment, Mellum2 is built for routing, Q&A, sub-agents, and private AI use in software engineering systems. Today, we’re open-sourcing Mellum2, a 12B model engineered to solve the hardest parts of production AI: latency, throughput, and cost.…

Indexing is one of the most important and hardest to optimize parts of an IDE. We applied AlphaEvolve to see whether it could uncover performance improvements in a mature, highly optimized codebase.

Koog 1.0 is out! JetBrains’ AI agent framework for Kotlin and Java now features a stable core with a 1-year API stability guarantee for production backends.

Postponed refactoring isn't a discipline problem — it's a risk calculation. Here's how four teams changed what went into that calculation.

We're excited to announce that the Early Access Program (EAP) for ReSharper and .NET Tools 2026.2 is now underway! While our EAP announcements usually cover a wide range of new features, performance updates, and bug fixes, this release is different. We are dedicating this first preview entirely t…

AI coding tools are raising PR volume and changing the defect profile. Your reviewers are the same people. Here's what the data says about the gap.

443 developers applied. 39 projects shipped. Here's a deepdive on the finalists and their projects presented at the JetBrains X Codex Hackathon in San Francisco.

We ran the same coding tasks with and without prebundled tooling, across multiple models and languages. Here's what changed.

Your developers' AI tools are only as good as what they know going in. When those tools run through the right IDE, it can give them a head start – a picture of the codebase the tools would otherwise need to piece together themselves. That means your team's IDE choices belong on your AI agenda alo…

443 developers applied. 39 projects shipped. Here's a sneak peak at everything that went down at the JetBrains X Codex Hackathon in San Francisco.

We’ll keep building AI workflows that speed up creation – and we’ll keep strengthening the IDE as the best place to review, understand, and own what gets shipped.

Install JetBrains verified skills once, then use them across agents and projects.