Microsoft built a model that doesn't talk. That's the point.
Microsoft launched Decision-1 on October 9, post-trained from Alibaba's Qwen3.5-9B, that returns probability scores for a fixed option set rather than generating text. At $0.042/M input with output tokens free and 35× faster than GPT-6 Sol at P50 latency, it reframes what the routing layer of an AI system should look like.