Baseten releases joey-1, a 2B open-source decision model with single-forward-pass probabilities
baseten · x · 2026-10-30
Baseten's Base Labs team released joey-1 (2B), their third open-source "system one" decision model: given structured context plus typed questions, it returns calibrated probabilities in a single forward pass instead of free-form text.
- Use cases: request routing, classification, yes/no checks, rubric scoring
- MIT-licensed, priced at $0.01/1M tokens with free cached input
- Top-ranked 2B model on the Jev Decision Index 0.4 at release
- Available via Model API, dedicated deployment, and fine-tuning cookbook
It completes the decision model family alongside mammoth-1 (27B) and elephant-1 (9B) released last week.
Related event: Baseten Open-Sources 2B Decision Model joey-1(3 posts)→
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