Microsoft-Decision-1

Microsoft-Decision-1 is an AI model that scores the choices a developer supplies. It can help software classify a request, choose a route or assess a bounded decision without generating a long answer.

Microsoft launched the model on 9 October 2026. It is derived from Qwen3.5-9B and available through Microsoft Foundry and OpenRouter.

Give the model the allowed choices

The developer defines the input and the possible decisions. The model returns scores that software can use to choose between them. A support system might supply a message and a set of departments; a document workflow might supply a passage and its permitted categories.

The Foundry guide specifies the supported request format. The choice list and decision criteria need to match the task: a high score is a model prediction, so teams should check its accuracy on representative examples.

The launch price is based on input

Microsoft lists $0.042 per million input tokens and free output in its announcement. Check the selected provider’s price and billing terms before deployment. The OpenRouter listing provides its access route.

For comparisons, Liquid d1 uses a similar decision-scoring approach with separate hosted and downloadable models. Evaluate each model on the actual categories, error costs and response-time requirements of the application.