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Baseten: Elephant 1

baseten/elephant-1

Model weights

Elephant 1 is a 9B decision model from Base Labs, Baseten's research team, built on Qwen3.5-9B. Given a state (text or JSON) and typed questions (yes/no, multiple choice, or ordinal score), it returns a calibrated probability for every option in a single forward pass, with no text generation. It is TypeSafe System One compatible and suits routing, classification, and scoring where you need a scored answer instead of prose. Its larger sibling is Mammoth 1Opens in new tab.

Modalities
Context
16K
Released
Oct 21, 2026
PlaygroundActivityDocumentationFAQExplore

Playground

Activity

Token volume and request traffic to this model over time.

Not currently available through EU in-region routing. In-region routing docs

Documentation

Guides, cookbooks, blog posts, and tools for building with Baseten: Elephant 1 on OpenRouter.

  • Decisions LabLab

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Decision Model RankingsRanking

Frequently asked questions

Elephant 1 is a 9B decision model from Base Labs, Baseten's research team, built on Qwen3.5-9B. Given a state (text or JSON) and typed questions (yes/no, multiple choice, or ordinal score), it returns a calibrated probability for every option in a single forward pass, with no text generation.

The Elephant 1 documentation on OpenRouter includes the interactive Decisions Lab. The quickstart covers API keys and your first request, and the API reference lists every parameter.

Elephant 1 has a 16,384 token context window.

Elephant 1 accepts text as input and returns structured decisions.

Elephant 1 was released on October 21, 2026.

More models from Baseten

Mammoth 1

Mammoth 1 is a 27B decision model from Base Labs, Baseten's research team, built on Qwen3.5-27B. Given a state (text or JSON) and typed questions (yes/no, multiple choice, or ordinal score), it returns a calibrated probability for every option in a single forward pass, with no text generation. It is TypeSafe System One compatible and suits classification, routing, and scoring where you need a scored answer instead of prose. Its smaller sibling is Elephant 1.

Decisions