# JetBrains/Mellum2-12B-A2.5B-Base

Model from Hugging Face for text generation: JetBrains/Mellum2-12B-A2.5B-Base · transformers

## Facts

- Type: LLM
- Task: text-generation
- Framework: transformers
- License: apache-2.0 — Permissive open license: commercial use, modification, and redistribution are permitted. (https://spdx.org/licenses/Apache-2.0.html)
- Source: https://huggingface.co/JetBrains/Mellum2-12B-A2.5B-Base
- Hosting: hosted (11 files)
- Files: 11 hosted of 15 listed
- File counts: "listed" is every file in the source repository; only hosted files download from Hugging Bay, and the download plan lists the files it selects for one download, so its count can differ.
- Hosted here: 11 files, 24.3 GB
- Full repo upstream: 24.3 GB
- Recommended file: 24.3 GB (5 files)
- Parameters: 12B (2.5B active)
- Download: https://huggingbay.xyz/artifact/hf-model-jetbrains-mellum2-12b-a2-5b-base/files (download plan: https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/download-plan)
- Per-file SHA-256: available for 11 of 11 hosted files via https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/files?limit=100
- Run-ready: no (Hugging Bay has not certified a run path for this model; hosted bytes are downloadable and hash-checkable only)
- Peer-assisted fallbacks: 0 verified, 0 pending review
- Downloads: 19608
- Stars: 26
- Card completeness: 96%

## Description

External Hugging Face catalog record for JetBrains/Mellum2-12B-A2.5B-Base. Task: text generation. Library: transformers. Languages: en. Includes 12 model-card evaluation signals. Popularity signal at import: 22,482 downloads and 26 likes.

## Model Card Facts

- Declared license: apache-2.0
- Pipeline: text-generation
- Library: transformers
- Task categories: text-generation
- Languages: en
- Paper ids: 2605.31268
- Model-index entries: Mellum2 Base
- Evaluation signals: 12 model-card eval results
- File hints: 15 upstream file samples

## Evaluation Signals

- HumanEval: pass@1 = 41.46 (Text Generation)
- HumanEval+: pass@1 = 37.2 (Text Generation)
- MBPP: pass@1 = 62.4 (Text Generation)
- MBPP+: pass@1 = 78.31 (Text Generation)
- MultiPL-E HumanEval, 7 languages: pass@1 = 20.97 (Text Generation)
- CRUXEval-I: pass@1 = 45.38 (Text Generation)
- CRUXEval-O: pass@1 = 43.88 (Text Generation)
- MMLU: accuracy = 70.87 (Text Generation)
- MMLU-Pro: exact match = 59.31 (Text Generation)
- BBH: exact match = 74.9 (Text Generation)

## Referenced Data

- Paper: 2605.31268

## File Hints

- .eval_results/mellum2.yaml (1.0 KB)
- .gitattributes (1.5 KB)
- README.md (9.4 KB)
- config.json (2.3 KB)
- generation_config.json (111 B)
- mellum-logo-dark.svg (5.1 KB)
- model-00001-of-00005.safetensors (4.7 GB) LFS
- model-00002-of-00005.safetensors (4.7 GB) LFS
- model-00003-of-00005.safetensors (4.7 GB) LFS
- model-00004-of-00005.safetensors (4.7 GB) LFS
- model-00005-of-00005.safetensors (4.0 GB) LFS
- model.safetensors.index.json (514 KB)

## Quality Checklist

- Summary: passed
- Description: passed
- Model card metadata: passed
- License: passed
- Provenance: passed
- File inventory: passed
- Hosted bytes: passed
- Scan result: passed
- Manifest signature: passed

## Safety Notes

- External catalog metadata imported from Hugging Face public API on 2026-09-21T07:59:15.920Z.
- Upstream license: apache-2.0. Mirror admission policy: permissive (owner policy; no license rights inferred).
- Model-index metadata found for Mellum2 Base.
- Not a run kit: hosted, hash-checked bytes only; run readiness is not certified for this model yet.

## Actions

- Web: https://huggingbay.xyz/artifact/hf-model-jetbrains-mellum2-12b-a2-5b-base
- Files API: https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/files?limit=100
- Metadata: https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/metadata.json
- Distribution: https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/distribution
- Manifest: https://huggingbay.xyz/api/manifests/hf-model-jetbrains-mellum2-12b-a2-5b-base
- Download plan (per-file SHA-256 + signed download URLs): https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/download-plan
- Hosted download rows: https://huggingbay.xyz/api/downloadable-files?artifactId=hf-model-jetbrains-mellum2-12b-a2-5b-base&limit=100
- Request mirror: not applicable.
- Submit peer fallback for review: POST https://huggingbay.xyz/api/artifacts/hf-model-jetbrains-mellum2-12b-a2-5b-base/decentralized-fallbacks