---
id: "2026-10-09-microsoft-decision-1"
url: "https://postcutoff.com/e/2026-10-09-microsoft-decision-1/"
as_of: "2026-10-10T14:45:00+02:00"
date: "2026-10-09"
date_precision: day
category: model-release
importance: 2
confidence: high
status: [Confirmed]
sources: 3
editor: Adam Bicz
human_review: null
version: "2026-10-10"
---

As of: 2026-10-10 14:45 CEST.
Researched and written by AI agents (Claude Opus 5.5 in Claude Code). Human editor: Adam Bicz.
Canonical page: https://postcutoff.com/e/2026-10-09-microsoft-decision-1/

# Microsoft-Decision-1 decision model

Full title: Microsoft releases Microsoft-Decision-1, a Jev-style decision model post-trained from Qwen3.5-9B, at $0.042 per 1M input tokens

On Oct 9, 2026 Microsoft introduced Microsoft-Decision-1, a decision-scoring model for routing, classification, prioritization, verification and workflow control, post-trained from Qwen3.5-9B. Microsoft says it had the highest accuracy in its own 36-benchmark comparison (~150,000 questions) and a p50 latency 2.5x lower than the runner-up and ~35x lower than GPT-6 Sol. Pricing is $0.042 per 1M input tokens with free output, the same as TypeSafe's Jev. It is the latest in a wave of Jev-style decision models.

## Key facts
- Announced Oct 9, 2026 on Microsoft's Command Line blog ('Introducing Microsoft-Decision-1, our model for fast decision-making') by Achint Srivastava, VP of Software Engineering, Office of the CTO
- Base: post-trained Qwen3.5-9B; Microsoft plans to rebase it on other models, 'including Microsoft AI and OpenAI'
- Microsoft's claims: highest accuracy in a 36-benchmark comparison spanning ~150,000 questions; p50 latency '2.5 times quicker than H2O-Lightning-4B v1.1, the runner-up, and 35 times quicker than GPT-6 Sol'; changes its decision on 1.3% of perturbations on average; refused harmful behaviour on 5,250 requests across 11 benchmarks. No per-benchmark accuracy numbers were published in the post
- Internal users (Microsoft's figures): Xbox Research '14 times faster and 200 times less expensive' than GPT-6 Sol; Copilot team '100 times faster' than GPT-5.6 Luna; Microsoft Discovery '46 times more consistent' scoring
- Price: $0.042 per 1M input tokens, output free; available in Microsoft Foundry (catalog id Microsoft-Decision-1) and, per Microsoft, OpenRouter (the OpenRouter page returned 404 and the model was absent from OpenRouter's models API on Oct 10)
- No weights release is mentioned in the post (no Hugging Face repo found on Oct 10)
- Hacker News (185 points): a commenter reported it as slower than Jev at p50 (figures of 283 ms and 369 ms were quoted); unverified community measurement

## What happened

Microsoft published Microsoft-Decision-1 on Oct 9, 2026, the same day TypeSafe announced its $870M Series A. Like TypeSafe's Jev, Cloudflare's Clef, Perplexity's pplx-decider and OpenAI's Decisions API, it is a "decision model": it scores a fixed set of options for typed questions (routing, classification, prioritization, verification) and returns a choice instead of generating free text. It is a post-trained Qwen3.5-9B, and Microsoft says it will rebase it on Microsoft AI (MAI) and OpenAI models later.

All accuracy, latency and robustness figures are Microsoft's own; the post gives ratios and totals but no per-benchmark scores.

## Why it matters

Another large company has shipped a decision model priced like Jev within four weeks of Jev's launch, which confirms decision models as a product category. Microsoft basing it on a Chinese open-weight model (Qwen) rather than on its own MAI or OpenAI models is notable.

## Your AI and this story

- GPT-6 Astra (training cutoff April 2026): 162 days after its cutoff
- Claude Opus 5.5 (training cutoff June 2026): 101 days after its cutoff
- Gemini 3.8 Flash (training cutoff March 2026): 192 days after its cutoff
- Grok 4.7 (training cutoff May 2026): 131 days after its cutoff

## Sources

1. [Microsoft Command Line: Introducing Microsoft-Decision-1, our model for fast decision-making](https://commandline.microsoft.com/microsoft-decision-1-model-foundry/) (commandline.microsoft.com, official)
2. [Microsoft Foundry model catalog: Microsoft-Decision-1](https://ai.azure.com/catalog/models/Microsoft-Decision-1) (ai.azure.com, docs)
3. [Hacker News discussion (185 points)](https://news.ycombinator.com/item?id=50024913) (news.ycombinator.com, discussion)

## Changes

- 2026-10-10 (filed): Created

## Related

- 2026-10-09: [TypeSafe AI, maker of the Jev decision model, raises ~$870M led by a16z at a $7.5B valuation](https://postcutoff.com/e/2026-10-09-typesafe-ai-870m-a16z-7-5b/index.md)
- 2026-10-06: [OpenAI opens the Decisions API to all developers in public beta](https://postcutoff.com/e/2026-10-06-openai-decisions-api-public-beta/index.md)
- 2026-10-01: [Cloudflare releases Clef and Clef-flash, open-weight multimodal decision models that are Jev-API compatible](https://postcutoff.com/e/2026-10-01-cloudflare-clef-decision-models/index.md)
- 2026-10-01: [Perplexity launches a Decisions API and open-sources pplx-decider-v1-27b, a decision model it says edges Jev (85.71% vs 84.51%)](https://postcutoff.com/e/2026-10-01-perplexity-decisions-api-pplx-decider/index.md)
- 2026-09-15: [TypeSafe AI releases Jev, a 'System One' decision model that returns typed probabilities instead of text](https://postcutoff.com/e/2026-09-15-typesafe-jev-system-one-model/index.md)
- Models: [Microsoft-Decision-1](https://postcutoff.com/m/microsoft-decision-1/) (`microsoft-decision-1`)