mammoth-1-GGUF

mammoth-1 is an MIT-licensed, 27-billion-parameter decision model developed by Base Labs at Baseten through a text-only full fine-tune of Qwen3.5-27B for tasks such as classification, routing, and guardrails. Designed to evaluate a given input state against multiple questions simultaneously—supporting yes/no (noul), multiple-choice (choice), and ordered level (score) formats—it utilizes a block-bidirectional attention mask and a single shared-prefix prefill (up to 16,384 tokens) to return calibrated probabilities for every option in a single pass. Trained on 6.21 million decision examples across 72 GB300 GPUs using cross-entropy combined with a Brier calibration term and a built-in abstention ("I don't know") option, mammoth-1 achieves top-tier benchmark performance, ranking #1 out of 208 models on the Jev Decision Index 0.4 (71.24) and #1 on a replica of the Artificial Analysis Decision Index (65.9). It can be accessed via Baseten Model APIs or self-hosted on a CUDA GPU, and is accompanied by a smaller 9B sibling model, elephant-1, for faster and lower-cost decision-making.

MTP — Speculative Decoding: No

Model Files

File Name Quant Type File Size File Link Description
mammoth-1.BF16.gguf BF16 53.8 GB Link Full BF16 weights. Highest quality, largest file size.
mammoth-1.Q3_K_L.gguf Q3_K_L 14.3 GB Link Lower quality but usable, good for low RAM availability.
mammoth-1.Q4_K_M.gguf Q4_K_M 16.5 GB Link Good quality, default size for most use cases, recommended.
mammoth-1.Q5_K_M.gguf Q5_K_M 19.2 GB Link High quality, recommended.
mammoth-1.Q6_K.gguf Q6_K 22.1 GB Link Very high quality, near perfect, recommended.
mammoth-1.mmproj-bf16.gguf mmproj-bf16 931 MB Link Multimodal projection file in BF16 format. Used for vision/language models.

llama.cpp

LLM inference in C/C++ — https://github.com/ggml-org/llama.cpp

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GGUF
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qwen35
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