Mellum2.1 12B-A2.5B

---
schema: "https://insidethemachine.ai/schema/listing.schema.json"
slug: "mellum-2-1"
name: "Mellum2.1 12B-A2.5B"
kind: "model"
tier: "catalog"
category: "models"
category_label: "Models from the channel"
stack_layer: "model"
homepage: "https://huggingface.co/JetBrains/Mellum2.1-12B-A2.5B-Thinking"
repo: null
license: "apache-2.0"
stars: null
last_push: null
archived: null
tags: []
seen_in_videos: ["_JhhrV3VDqg"]
gap_score: null
gap_score_status: "pending test on Mac Studio"
verified_on: "2026-10-15"
---

# Mellum2.1 12B-A2.5B

**What:** JetBrains coding model, 12B with 2.5B active.

**Why:** Featured on Inside the Machine; check the fit before you download.

**Category:** Models from the channel · **Stack layer:** model

## Status

Catalog entry. Existence and repo metadata checked 2026-10-15 via the Hugging Face API. Install commands below are auto-extracted from the README and have NOT been executed or verified. Read the README before running anything; prefer a sandbox or venv.

## Install (unverified)

1. [any] source: huggingface_hub CLI docs (generic); status: documented, not executed

```bash
hf download JetBrains/Mellum2.1-12B-A2.5B-Thinking
```

## Verify

No verified check yet. Minimum: the install command exits 0 and the tool's own help/version flag runs (exact flag: see README).

## Rollback (unverified)

1. source: huggingface_hub cache docs

```bash
hf cache rm JetBrains/Mellum2.1-12B-A2.5B-Thinking  # or delete it from ~/.cache/huggingface/hub
```

## Links

- Homepage: https://huggingface.co/JetBrains/Mellum2.1-12B-A2.5B-Thinking
- Video: https://www.youtube.com/watch?v=_JhhrV3VDqg