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Comparing Microsoft-Decision-1 and Nace AI Drex 1.5

Architecture / BaseQwen3.5-9B (Microsoft-Decision-1)
Model Size9B (Drex 1.5)

Both Microsoft AI and Nace AI introduced 9B decision-focused models in early October 2026. While both target decision tasks, their reported specifications and framing differ slightly based on available evidence.

Reported Facts

  • **Microsoft-Decision-1**: Developed by Microsoft AI, this model is built as a Qwen3.5-9B decision-scoring model (Evidence 7).
  • **Drex 1.5**: Open-sourced by Nace AI, this model is specified as a 9B decision model specifically designed to score options rather than generate text (Evidence 8).
  • Analysis

    Both models occupy the 9B parameter tier, suggesting a balanced approach between edge/local deployability and reasoning capacity for decision support workflows. While Microsoft's variant leverages a Qwen3.5 base architecture, Nace AI emphasizes option-scoring mechanics. No hands-on testing or benchmark comparisons beyond their initial announcements are currently available.

    Research sources