Mellum by JetBrains
Mellum by JetBrains offers efficient open-source models for low-latency coding and language tasks.
Open SourceCoding & Dev
Visit website Free to browse · updated 2026-06-20
What is Mellum by JetBrains?
Mellum features a mixture-of-experts design that enables rapid inference while maintaining quality across programming and conversational uses. The approach allows it to handle context and intent effectively, making it suitable for production environments rather than just experimental setups. Users can apply the models to tasks such as prompt routing, information retrieval pipelines, and breaking down complex agent processes into specialized steps. Local or cloud hosting options provide control over data privacy and infrastructure choices. The lineup includes versions optimized for different priorities, with capabilities for fine-tuning on custom data and consistent performance in multilingual coding scenarios.
Key features
Open-source family of fast language models
Mixture-of-experts (MoE) architecture for ultra-low-latency inference
Optimized for real-world coding and natural language tasks
Supports local and cloud deployment
12B-parameter Mellum2 model for high-performance inference
Fine-tunable with transparent training data
High coding quality at lower inference cost
AI models Mellum by JetBrains uses
Mellum2
Best for low-latency, high-performance inference. A 12B-parameter open-source mixture-of-experts model
Mellum1
Best for efficient, high-quality code generation. An open-source coding model
What you can use Mellum by JetBrains for
Low-Latency RAG Pipelines
Retrieve relevant information and use Mellum to quickly summarize and generate responses, keeping question-answering systems fast and responsive.
Fast Sub-Agents in Workflows
Break down agent pipelines into steps like context gathering, planning, and validation, using Mellum for fast specialized tasks.
Private Local AI Usage
Keep code and data fully under control with local or self-hosted deployment for private and sovereign AI use cases.
How to use Mellum by JetBrains
- 1Visit the Mellum page on the JetBrains website
- 2Choose a model such as Mellum2 or Mellum1
- 3Access the open-source weights for download
- 4Deploy the model locally or on cloud infrastructure
- 5Integrate into workflows for coding or language tasks
Mellum by JetBrains pricing
Pricing model: Open Source. Plan details are indicative — check the site for current prices.
Open Source
Free
- Local or self-hosted deployment
- Cloud deployment
- Fine-tuning supported
Editor's verdict
Pros
- +Ultra-fast inference often twice as fast as similar models
- +Cost-efficient with fewer active parameters
- +Flexible local or self-hosted deployment for privacy
Cons
- –Not designed for tasks requiring largest models
- –Primarily targeted at development workflows
Our take: Mellum by JetBrains is a solid coding & dev choice. It's valued for ultra-fast inference often twice as fast as similar models and cost-efficient with fewer active parameters. The main trade-off is not designed for tasks requiring largest models. A good pick if you want capable AI without a high upfront cost.
Frequently asked questions
Mellum is a family of open-source fast language models by JetBrains optimized for real-world development workflows where latency and performance matter most.
Summary
Mellum by JetBrains is a solid coding & dev choice. It's valued for ultra-fast inference often twice as fast as similar models and cost-efficient with fewer active parameters. The main trade-off is not designed for tasks requiring largest models. A good pick if you want capable AI without a high upfront cost.
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