Microsoft-Decision-1 · comparison

Microsoft-Decision-1 vs Decision Models

Both answer typed questions with probabilities instead of prose. They differ in how you access them, whether the weights are open, and where processing happens. Facts as of 25 October 2026.

Get API key See the EU tier

At a glance

Dated facts side by side

Sources, retrieved 25 October 2026: OpenRouter model page (price, context, provider), Help Net Security, 12 Oct 2026 (base model, question types, Microsoft’s test figures). Microsoft’s own blog post of 9 Oct 2026 could not be fetched by us.

Feature	Microsoft-Decision-1	Decision Models
Announced	9 October 2026	API since September 2026, new model versions as they qualify (changelog)
Access	Microsoft Foundry (billed through your Azure subscription) and OpenRouter (provider: Azure)	Direct API with your own key; Peer-to-Peer and EU tiers
Input price per 1M tokens	$0.042 (OpenRouter list)	s1-fast €0.018 ($0.021) EU, €0.017 ($0.019) Peer-to-Peer; s1-pro €0.074 ($0.084) EU. All rates
Output tokens	Free	Free
Model	Post-trained from Qwen3.5-9B according to press reports; weights not released	Open weights (Apache-2.0) with named base models; every answer names the answering version
Context	32,768 tokens (OpenRouter list)	Depends on the model, see input limits
Question types	Yes/no, multiple choice, rating scale, rubric	`noul` (yes/no), `choice`, `score`
EU region	Not documented in the sources we checked	EU tier: inference only in the EU, public DPA
Speed	Microsoft reports 85 ms from its own tests (not independently verified)	We have not measured a head-to-head comparison and claim none

What it means

Which one fits

If you already bill through Azure, Foundry is the shortest path to Microsoft-Decision-1.
If you need EU-only processing by contract, open-weight models or a provider based in Germany, the Decision Models EU tier fits.
For both: no answer should be the only basis for decisions on credit, employment, housing, insurance, education, health or legal matters. Our EU AI Act statement sets out intended purpose and limits.

Try it

One request to Decision Models

A yes/no question on the EU tier; the answer is the probability of “yes”.

Request · POST /v1/systemone

curl https://api.decisionmodels.io/v1/systemone \
  -H "Authorization: Bearer $DECISIONMODELS_API_KEY" \
  -H "Content-Type: application/json" \
  -H "S1-Region: eu" \
  -d '{"model":"s1-fast","state":"Ticket: I was charged twice for my order.","questions":{"refund":{"type":"noul","instructions":"Is the customer asking for a refund?"}}}'

Microsoft and Microsoft-Decision-1 are trademarks of Microsoft Corporation. Decision Models is not affiliated with Microsoft and uses the names only for comparison.