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

Nace.AI has open-sourced Drex 1.5, a 9B decision model for agents and backend workflows that reads a state and typed questions, then returns a probability for every option. It scores 58.08 on the public Decision Index 0.3.1, the top result under 10B parameters. Weights are on Hugging Face, with a hosted version on OpenRouter.

• 8.95B dense parameters, 16,384-token context expandable to 131,072
• 58.08 on Decision Index 0.3.1, within the tie band of closed Jev 1.13.0 (57.96)
• 93.4% accuracy on 32K–128K token documents, but 7.4% F1 on ACOS sentiment
• Runs on one 24 GB A10G GPU or as a ~9.5 GB Q8_0 GGUF on Apple silicon