Microsoft-Decision-1
Microsoft's decision model in Microsoft Foundry for fast classification and scoring decisions, built on Qwen3.5-9B.
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- System 1 vs System 2 model routing: which decisions a decision model should take, and which still need a reasoning model
Route a decision to a System 1 model only when it is bounded, labelled and cheap to get wrong. A 0.90 confidence gate kept 84.0% accuracy at $0.69 per 1,000.
- Microsoft-Decision-1 vs Jev: price per decision, latency, accuracy and what switching costs
Jev was faster in every outside test; Microsoft-Decision-1 has Jev's $0.042 token price but cost $0.0178 per 1,000 decisions to $0.0324 on one harness.