Microsoft launches Decision-1, a probability model instead of generative AI

Microsoft has launched Decision-1, an AI model that returns calibrated probabilities for a fixed set of answers rather than free-form text. Built by post-training Qwen3.5-9B, it is available via Microsoft Foundry and OpenRouter at 4.2 cents per million input tokens with no charge for output tokens.

• Model returns calibrated probabilities for predefined answers in a single pass
• Pricing is 4.2 cents per million input tokens, output tokens free
• Microsoft claims it is 2.5x faster than the runner-up in benchmarks
• Model gives no rationale, complicating validation and audit of decisions