{"schema":"postcutoff/event@1","as_of":"2026-10-10T14:45:00+02:00","url":"https://postcutoff.com/e/2026-10-09-microsoft-decision-1/","md":"https://postcutoff.com/e/2026-10-09-microsoft-decision-1/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"Adam Bicz","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-10-09-microsoft-decision-1","date":"2026-10-09","date_precision":"day","short_title":"Microsoft-Decision-1 decision model","deck":null,"takeaway":"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.","category":"model-release","category_label":"Model releases","importance":2,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Microsoft Command Line: Introducing Microsoft-Decision-1, our model for fast decision-making","url":"https://commandline.microsoft.com/microsoft-decision-1-model-foundry/","type":"official","group":"primary","domain":"commandline.microsoft.com"},{"n":2,"title":"Microsoft Foundry model catalog: Microsoft-Decision-1","url":"https://ai.azure.com/catalog/models/Microsoft-Decision-1","type":"docs","group":"primary","domain":"ai.azure.com"},{"n":3,"title":"Hacker News discussion (185 points)","url":"https://news.ycombinator.com/item?id=50024913","type":"discussion","group":"reactions","domain":"news.ycombinator.com"}],"official":2,"filed":"2026-10-10","updated":"2026-10-10","orgs":["Microsoft"],"title":"Microsoft releases Microsoft-Decision-1, a Jev-style decision model post-trained from Qwen3.5-9B, at $0.042 per 1M input tokens","summary":"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"],"key_numbers":[],"tags":["decision-model","api","classification","routing","jev","qwen","microsoft-foundry"],"science":null,"body_md":"## What happened\n\nMicrosoft 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.\n\nAll accuracy, latency and robustness figures are Microsoft's own; the post gives ratios and totals but no per-benchmark scores.\n\n## Why it matters\n\nAnother 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.","disputed":[],"related":[{"id":"2026-10-09-typesafe-ai-870m-a16z-7-5b","url":"https://postcutoff.com/e/2026-10-09-typesafe-ai-870m-a16z-7-5b/","date":"2026-10-09","date_precision":"day","short_title":"TypeSafe AI, maker of the Jev decision model, raises ~$870M led by a16z at a $7.5B valuation","deck":null,"takeaway":"Investors are now pricing \"decision models\" as a separate product category from chat LLMs.","category":"business","category_label":"Business","importance":3,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":4,"official":0,"filed":"2026-10-09","updated":"2026-10-09","orgs":["TypeSafe AI","Andreessen Horowitz","Sequoia Capital"]},{"id":"2026-10-06-openai-decisions-api-public-beta","url":"https://postcutoff.com/e/2026-10-06-openai-decisions-api-public-beta/","date":"2026-10-06","date_precision":"day","short_title":"OpenAI opens the Decisions API to all developers in public beta","deck":"Gpt-6-luna typed answers at $0.10 per 1M input tokens, output free","takeaway":"Decision models (one forward pass that scores a fixed set of answers) went from one startup's product (Jev, Sept 15) to a category with OpenAI, Cloudflare and Perplexity offerings within three weeks.","category":"product","category_label":"Products","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":4,"official":3,"filed":"2026-10-07","updated":"2026-10-07","orgs":["OpenAI"]},{"id":"2026-10-01-cloudflare-clef-decision-models","url":"https://postcutoff.com/e/2026-10-01-cloudflare-clef-decision-models/","date":"2026-10-01","date_precision":"day","short_title":"Cloudflare releases Clef and Clef-flash, open-weight multimodal decision models that are Jev-API compatible","deck":null,"takeaway":"It is the second big-company follower in two days, after AWS's Strands Decider 2B.","category":"open-source","category_label":"Open source","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":8,"official":6,"filed":"2026-10-02","updated":"2026-10-10","orgs":["Cloudflare"]},{"id":"2026-10-01-perplexity-decisions-api-pplx-decider","url":"https://postcutoff.com/e/2026-10-01-perplexity-decisions-api-pplx-decider/","date":"2026-10-01","date_precision":"day","short_title":"Perplexity launches a Decisions API and open-sources pplx-decider-v1-27b, a decision model it says edges Jev (85.71% vs 84.51%)","deck":null,"takeaway":"Within three weeks of Jev's launch, at least four large companies shipped compatible or competing \"System One\" decision models, two of them open-weight, which turns a single startup's product into a model category.","category":"model-release","category_label":"Model releases","importance":2,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":5,"official":3,"filed":"2026-10-03","updated":"2026-10-10","orgs":["Perplexity"]},{"id":"2026-09-15-typesafe-jev-system-one-model","url":"https://postcutoff.com/e/2026-09-15-typesafe-jev-system-one-model/","date":"2026-09-15","date_precision":"day","short_title":"TypeSafe AI releases Jev, a 'System One' decision model that returns typed probabilities instead of text","deck":null,"takeaway":"It is a new product shape for language models, a cheap, fast \"function call\" for judgments, and it was widely discussed as a complement to frontier agents in the same week as Claude Opus 5.5 and GPT-6 Sol.","category":"model-release","category_label":"Model releases","importance":3,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":18,"official":9,"filed":"2026-09-29","updated":"2026-10-10","orgs":["TypeSafe AI"]}],"people":[],"posts":[],"videos":[],"models":[{"id":"microsoft-decision-1","name":"Microsoft-Decision-1","url":"https://postcutoff.com/m/microsoft-decision-1/"}],"changes":[{"date":"2026-10-10","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-10-10","run":null,"sources_read":null,"updated":"2026-10-10","human_review":null,"version":{"date":"2026-10-10"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":162,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":101,"in_training_data":false},{"model_id":"gemini-3-8-flash","name":"Gemini 3.8 Flash","cutoff":"2026-03","days_after":192,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":131,"in_training_data":false}],"short_url":null}