{"version":1,"type":"story","url":"https://digestai.news/story/jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face","json":"https://digestai.news/story/jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face.json","markdown":"https://digestai.news/story/jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face.md","slug":"jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face","headline":"JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face","summary":"The 12 B mixture‑of‑experts model keeps the same architecture as the previous version—28 layers, 2.5 B active parameters, 64 experts (8 active per token), 131,072 token context length, and a 1,024‑token sliding window—but adds a speculative decoding draft layer trained via reinforcement learning at scale.\n\nThe release is open‑source under the Apache 2.0 license and requires vLLM 0.33+ and transformers 5.20+ to use the head. The model is positioned for complex agentic tasks such as repository navigation, command execution, and tool use, as well as hard non‑agentic coding, math, and reasoning problems.","keyPoints":["12 B MoE model with 2.5 B active parameters adds a multi‑token prediction head for speculative decoding","Self‑reported benchmarks show strong coding and reasoning scores, e.g., 91.500 % HumanEval pass@1"],"whyItMatters":"An open‑weight 12 B model that decodes up to twice as fast can lower compute costs for developers building autonomous agents and coding assistants.","category":{"slug":"models","name":"Generative AI & Models","url":"https://digestai.news/category/models"},"entities":{"companies":["JetBrains"],"models":["Mellum2.1 Thinking"],"people":[]},"firstPublishedAt":"2026-11-02T03:58:06Z","updatedAt":"2026-11-02T03:58:06Z","sourceCount":1,"hasPrimarySource":true,"sources":[{"outlet":"huggingface.co","title":"JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face","url":"https://huggingface.co/JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP","publishedAt":"2026-11-02T03:58:06Z","type":"primary","primary":true,"lead":true}],"sourceNotes":null,"discussions":[{"site":"Reddit","url":"https://www.reddit.com/r/LocalLLaMA/comments/1xln8f2/jetbrainsmellum2112ba25bthinkingmtp_hugging_face/","points":null}],"thread":null,"cite":{"text":"Digest AI, \"JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face\", 2 November 2026, https://digestai.news/story/jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face","publisher":"Digest AI","title":"JetBrains/Mellum2.1-12B-A2.5B-Thinking-MTP · Hugging Face","datePublished":"2026-11-02T03:58:06Z","url":"https://digestai.news/story/jetbrains-mellum2-1-12b-a2-5b-thinking-mtp-hugging-face"},"generatedBy":"Written by Digest AI's editorial model from the linked sources; the sources are the record.","license":"Headlines, digests and key points are written by Digest AI and may be quoted with a link to the story page. Linked articles belong to their publishers. Terms: https://digestai.news/terms#reuse"}