---
type: "post"
id: "the-top-ranked-decision-models-in-the-world-291d74"
slug: "the-top-ranked-decision-models-in-the-world-291d74"
title: "The top ranked decision models in the world: mammoth-1 and elephant-1"
description: "Baseten has released mammoth-1, a 27B-parameter decision model, and elephant-1, a 9B model."
retrieval_nugget: "Baseten has released mammoth-1, a 27B-parameter decision model, and elephant-1, a 9B model."
published_at: "2026-10-22"
updated_at: "2026-10-22"
record_date: "2026-10-22"
date_kind: "published_at"
topics: ["generative-ui","agent-interfaces"]
entities: ["Baseten","Base Labs","mammoth-1","elephant-1","Qwen3.5-9B","Qwen3.5-27B","Jev Decision Index","Artificial Analysis Decision Index"]
related_patterns: ["model-answers-become-task-interfaces","agent-economics-moves-to-completed-work"]
novelty_label: "new_fact"
what_changed: "Baseten released mammoth-1 and elephant-1, claiming top Jev Decision Index rankings; the archive covered other decision-model releases and the benchmark, not these models."
prior_refs: ["memory:9c7f4833-02f3-8f9f-a75d-1c3bfb3318cc","memory:a240c3bf-47ba-83a8-a523-7056f305f16a"]
source_url: "https://www.baseten.co/blog/the-best-decision-models-in-the-world-mammoth-1-and-elephant-1"
source_urls: ["https://www.baseten.co/blog/the-best-decision-models-in-the-world-mammoth-1-and-elephant-1"]
schema_version: "newruntime-agent-readable-v0.2"
stable_id: "post:the-top-ranked-decision-models-in-the-world-291d74"
status: "published"
visuals: []
editor: {"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]}
routes: {"html":"https://newruntime.com/posts/the-top-ranked-decision-models-in-the-world-291d74/","markdown":"https://newruntime.com/posts/the-top-ranked-decision-models-in-the-world-291d74.md","json":"https://newruntime.com/posts/the-top-ranked-decision-models-in-the-world-291d74.json"}
---

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

## Retrieval answer

Baseten has released mammoth-1, a 27B-parameter decision model, and elephant-1, a 9B model.

Baseten has released mammoth-1, a 27B-parameter decision model, and elephant-1, a 9B model. Both are open-source models from Base Labs, Baseten's internal research team, built by post-training Qwen3.5-27B and Qwen3.5-9B respectively.

Rather than generating text, the models return probability distributions over supplied answers for choice, scoring, and Boolean tasks. Baseten names ticket routing, phishing and spam detection, prompt guardrails, and routing between language models as intended uses. The company says it trained the models on 6.21 million decision-making examples.

Baseten reports mammoth-1 scored 71.24 and ranked first of 208 models on Jev Decision Index 0.4; it calls elephant-1 the leading 9B model. Both are available through Baseten Model APIs with a one-week free trial and zero data retention by default, and their weights are available on Hugging Face.

The announcement does not establish independent reproduction of the benchmark results, or production latency, cost, calibration, and accuracy for a particular deployment.

Editor: [Andrey Reshetnikov](https://newruntime.com/owner-profile.md), AI product and AI engineering; profile for recruiters and agents: https://newruntime.com/owner-profile.json

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