Introducing Mellum: JetBrains’ New LLM Built for Developers

Valerie Kuzmina

JetBrains has taken a major step forward in advancing AI-driven development tools with the launch of Mellum, a proprietary large language model (LLM) specifically designed to assist software developers. Currently available only with JetBrains AI Assistant, Mellum provides faster, smarter, and more contextually aware code completion.

There are hundreds of LLMs. Why Mellum?

Unlike typical large language models, Mellum is built specifically for coding. We are focused on creating a smaller, optimized model that significantly reduces latency, offering developers suggestions almost instantly. This makes Mellum more efficient than many of the third-party models currently available on the market.

Mellum already supports code completion for popular programming languages like Java, Kotlin, Python, Go, and PHP. To get support for even more languages, join our Early Access Program. 

How does Mellum perform?

Since its release, Mellum has already shown impressive results:

• Completion latency has been reduced to one third of its previous time, reflecting a significant decrease in the time taken to complete tasks.
• The acceptance rate of the completion suggestions powered by the Mellum model is about 40%, which is considered a solid benchmark in the industry.
• The cancel rate is now three to four times lower compared to the previous version of AI Assistant.
• The total number of completions shown has more than doubled compared to the previous version.

Mellum’s performance is also backed up by user reviews. By the way, thanks for being so active in the comments. We read each and every piece of feedback you give us!

For more on how Mellum enhances code completion, visit our latest blog post.

Deep integration with JetBrains IDEs

Mellum’s power isn’t just in its speed and accuracy; it also benefits from deep integration with JetBrains IDEs. This synergy between the client-side IDE and server-side AI logic allows Mellum to deliver contextually aware code suggestions that are tailored to each project’s needs.

A commitment to privacy

JetBrains has always been committed to privacy, and Mellum continues this tradition. The model has been trained solely on publicly available, permissively licensed code. 

Mellum represents a new era in developer tools, combining speed, precision, and privacy to improve the coding experience. Ready to see what Mellum can do for you? Check out Mellum’s capabilities in JetBrains AI Assistant today.

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