Microsoft's Decision-1 model lands on Vercel's AI Gateway
A model built for yes/no, multiple-choice and scoring questions, with probabilities attached to each answer, now needs only a Gateway key, no separate Azure account.
Vercel added Microsoft’s Decision-1 to its AI Gateway on 9 October. Unlike a general chat model, it is built to answer typed questions about text: yes/no, pick-a-category, or score-against-criteria. Choice and score answers come back with a probability attached to each option, so an application can decide to act automatically or flag an uncertain result for a human to check.
You call it as microsoft/microsoft-decision-1, through whichever of three interfaces you already use: the AI SDK’s decision API, the OpenAI-compatible Decisions API, or the TypeSafe-compatible API. Vercel’s gateway key is the only credential needed; there is no separate Azure account or deployment to set up.
Why it matters: this is a model for the plumbing of an app, not the chat window, routing tickets, scoring responses, deciding when a workflow needs a person. Getting it through an API key you already hold, rather than a new cloud account, is what makes it worth trying for something you’d otherwise hand-roll with a cheap chat model and a brittle prompt.