Mellum2 12B
Last refreshed 2026-06-01. Next refresh: weekly.
Mellum2 12B has model metadata, but missing tracked provider pricing keeps it from being a default production pick.
Decision context: Coding task fit, 0 tracked provider routes, and research from 2026-06-01.
Use it for
- Teams evaluating coding, rag, and agents
- Workloads that can use a 131k context window
Do not use it for
- Cost-sensitive launches that need sourced token pricing
- Vision or document-understanding workloads
- Teams that need a tracked hosted API route today
Cheapest output
-
No tracked output price
Provider routes
0
No provider route in seed
Quality / dollar
Unknown
No task benchmark coverage yet
Freshness
2026-06-01
Researched today
Top use-case fit
Coding
Included by capability and metadata signals in the decision map.
RAG
Included by capability and metadata signals in the decision map.
Agents
Included by capability and metadata signals in the decision map.
Provider price ladder
No tracked provider token pricing is available for this model yet.
Benchmark peer barsfor Coding
No task-mapped benchmark peers are available for this model yet.
Migration checks
No linked migration route is available for this model yet.
About
Mellum2 12B is JetBrains' open-weights mixture-of-experts model for software engineering workflows. It has 12B total parameters, activates about 2.5B parameters per token, and supports long-context coding, tool use, function calling, reasoning, and agentic assistance.
Mellum2 12B has a 131k-token context window.
Capabilities
Rankings
Specifications
Created by
Developer tools company building code-specialized Mellum models.