Mellum2 12B A2.5B Instruct is an open-source language model by JetBrains. Features: 12b LLM, VRAM: 24.3GB, Context: 128K, License: apache-2.0, Instruction-Based, LLM Explorer Score: 0.42.
Arxiv:2605.31268 Conversational En Endpoints compatible Eval-results Instruct Mellum Model-index Region:us Safetensors Sharded Tensorflow
Model Card on HF 🤗: https://huggingface.co/JetBrains/Mellum2-12B-A2.5B-Instruct
Mellum2 12B A2.5B Instruct Benchmarks
nn.n% — How the model compares to the reference models: Anthropic Sonnet 3.5 ("so35"), GPT-4o ("gpt4o") or GPT-4 ("gpt4").
What is the LLM Explorer Rank (Score)
Mellum2 12B A2.5B Instruct Parameters and Internals
| LLM Name | Mellum2 12B A2.5B Instruct |
| Repository 🤗 | https://huggingface.co/JetBrains/Mellum2-12B-A2.5B-Instruct |
| Model Size | 12b |
| Required VRAM | 24.3 GB |
| Updated | 2026-06-04 |
| Maintainer | JetBrains |
| Model Type | mellum |
| Instruction-Based | Yes |
| Model Files | |
| Supported Languages | en |
| Model Architecture | MellumForCausalLM |
| License | apache-2.0 |
| Context Length | 131072 |
| Model Max Length | 131072 |
| Transformers Version | 5.8.1 |
| Tokenizer Class | PreTrainedTokenizerFast |
| Padding Token | <|endoftext|> |
| Vocabulary Size | 98304 |
Rank the Mellum2 12B A2.5B Instruct Capabilities
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Original data from HuggingFace, OpenCompass and various public git repos.
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Release v20260328a