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Nace AI Open-Sources Drex 1.5: A 9B Decision Model That Scores Options, Not Text
First reported Source: MarkTechPostLast editorial activity
What happened
Weights are on Hugging Face, and a hosted version is live on OpenRouter . 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. Nace.AI has open-sourced Drex 1.5 , a 9B decision model for agents and backend workflows.
It reads a state and typed questions, then returns a probability for every option. Nace reports 58.08 on the public Decision Index 0.3.1 , the top score under 10B parameters.
Key facts
- Nace — reports: 58.08 on the public Decision Index 0.3.1 , the top score under 10B parameters
Sources & evidence
- MarkTechPost Reporting source
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/