# Nace AI Open-Sources Drex 1.5: A 9B Decision Model That Scores Options, Not Text

> Source: <https://www.marktechpost.com/2026/10/09/nace-ai-open-sources-drex-1-5-a-9b-decision-model-that-scores-options-not-text/>
> Published: 2026-10-10 04:51:34+00:00

Nace.AI has open-sourced Drex 1.5, a 9B decision model that returns a probability for every option in 1 forward pass. It scores 58.08 on Decision Index 0.3.1 and reads up to 128K tokens.

The post [Nace AI Open-Sources Drex 1.5: A 9B Decision Model That Scores Options, Not Text](https://www.marktechpost.com/2026/10/09/nace-ai-open-sources-drex-1-5-a-9b-decision-model-that-scores-options-not-text/) appeared first on [MarkTechPost](https://www.marktechpost.com).