# Baseten — The top ranked decision models in the world: mammoth-1 and elephant-1

- Company: Baseten (baseten.co)
- Announced: 2026-10-21T16:58:52+00:00
- Category: new-model
- Coverage: not counted
- Announcement: yes
- Group: models
- Source: https://www.baseten.co/blog/the-best-decision-models-in-the-world-mammoth-1-and-elephant-1
- Record: https://forck.live/items/26050-the-top-ranked-decision-models-in-the-world-mammoth-1-and-elephant-1
- Subject: Baseten
- Open weights: yes
- Models affected: mammoth-1, elephant-1, Qwen3.5-9B, Qwen3.5-27B
- Pricing: free to try for a week on Baseten Model APIs

Baseten released mammoth-1 and elephant-1, two decision models trained by its Base Labs research team, which return probability scores instead of generating text. The company says mammoth-1 ranks #1 of 208 decision models and elephant-1 leads 9B decision models on the Jev Decision Index, while elephant-1 ties for #1 with d1-ultra on the Artificial Analysis Decision Index. Baseten post-trained Qwen3.5-9B and Qwen3.5-27B on 6.21 million decision-making examples drawn from public and synthetic data covering decision skills, safety and abstention, and judging and expert domains. Both models are open-source on Hugging Face and free to try for a week through Baseten Model APIs, with zero data retention by default. Decision models take choice, score or boolean questions and are served without text generation, which Baseten says can be up to 10x faster than a reasoning model and cheaper than using a generative LLM for classification. Customizable confidence thresholds let teams accept an answer or escalate it, so a ticket can be routed automatically at 90% confidence and sent to a person below that.

## Evidence

Verbatim from https://www.baseten.co/blog/the-best-decision-models-in-the-world-mammoth-1-and-elephant-1:

> mammoth-1 ranks #1 out of 208 decision models, and elephant-1 is the leading 9B decision model on the Jev Decision Index. Both models are open-source and free to try for a week on Baseten Model APIs, with zero data retention (ZDR) by default.

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