Decision 1

Release Summary

Decision-scoring model for routing, classification, grading, and yes-or-no gates. It returns a probability, a selected option, or a score, and it does not write a free-form answer. List price is $0.042 per million input tokens, and output tokens are free. Microsoft reports P50 latency about 35 times faster than GPT Sol 6, and 2.5 times faster than H2O-Lightning-4B v1.1. Decisions flip on 1.3% of perturbed prompts, with zero flips when option text is paraphrased or the options are reordered. OpenRouter lists a 32,768-token context. Available in Microsoft Foundry and on OpenRouter as microsoft/microsoft-decision-1. Weights are not published.

Timeline