{"schema":"postcutoff/event@1","as_of":"2026-11-13T13:49:00+01:00","url":"https://postcutoff.com/e/2026-06-02-microsoft-mai-models-build-2026/","md":"https://postcutoff.com/e/2026-06-02-microsoft-mai-models-build-2026/index.md","disclosure":{"written_by":"AI agents (Claude Opus 5.5 in Claude Code)","editor":"human editor","policy":"https://postcutoff.com/about/"},"license":null,"id":"2026-06-02-microsoft-mai-models-build-2026","date":"2026-06-02","date_precision":"day","short_title":"Microsoft launches seven in-house MAI models at Build 2026, led by MAI-Thinking-1","deck":null,"takeaway":null,"category":"model-release","category_label":"Model releases","importance":4,"confidence":"high","status":{"key":"confirmed","labels":["Confirmed"]},"sources":[{"n":1,"title":"Microsoft AI - Launching seven new MAI models","url":"https://microsoft.ai/news/building-a-hillclimbing-machine-launching-seven-new-mai-models/","type":"official","group":"primary","domain":"microsoft.ai"},{"n":2,"title":"Microsoft AI - Build 2026 MAI keynote transcript","url":"https://microsoft.ai/news/microsoft-build-2026-mai-keynote-transcript/","type":"official","group":"primary","domain":"microsoft.ai"},{"n":3,"title":"Thurrott - Build 2026: Microsoft launches first flagship reasoning AI model","url":"https://www.thurrott.com/a-i/336960/build-2026-microsoft-launches-first-flagship-reasoning-ai-model-and-more","type":"press","group":"press","domain":"thurrott.com"},{"n":4,"title":"The AI Economy - Microsoft launches MAI-Thinking-1 and MAI-Code-1 at Build","url":"https://theaieconomy.substack.com/p/microsofts-mai-models-build-2026","type":"press","group":"press","domain":"theaieconomy.substack.com"}],"official":2,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Microsoft"],"title":"Microsoft launches seven in-house MAI models at Build 2026, led by MAI-Thinking-1","summary":"At Build on 2026-06-02 Microsoft AI (led by Mustafa Suleyman) launched seven first-party MAI models, including its first flagship reasoning model MAI-Thinking-1, the MAI-Code-1-Flash coding model in GitHub Copilot and VS Code, MAI-Image-2.5, MAI-Transcribe-1.5 and MAI-Voice-2 - Microsoft's clearest move from reselling OpenAI models to owning its own stack.","key_facts":["Announced 2026-06-02 at Microsoft Build","MAI-Thinking-1: first flagship reasoning model; Microsoft says it matches leading models on key SWE benchmarks and is preferred to Sonnet 4.6 in its evals","Press reports MAI-Thinking-1 as a 35B-active-parameter MoE scoring 97.0% on AIME 2025 (secondary sources)","MAI-Code-1-Flash: agentic coding model, 5B active parameters, in GitHub Copilot and VS Code","MAI-Image-2.5 (+ Flash): Microsoft claims it surpasses Nano Banana Pro's Arena score; in PowerPoint and Foundry","MAI-Transcribe-1.5: 43 languages, claimed 5x faster than competing models","MAI-Voice-2: speech generation in 15 languages with emotional control","Available on Microsoft Foundry, OpenRouter, Fireworks and Baseten"],"key_numbers":[],"tags":["microsoft","mai","reasoning","coding","image-generation","speech"],"science":null,"body_md":"## What happened\n\nMicrosoft AI released seven models spanning reasoning, coding, image generation, transcription and voice. The flagship\n**MAI-Thinking-1** is Microsoft's first frontier-class reasoning model; **MAI-Code-1-Flash** (5B active parameters) went\nstraight into GitHub Copilot and VS Code. The models are available via Microsoft Foundry and third-party hosts, and\ndevelopers can tune weights.\n\n## Why it matters\n\nComing weeks after the renegotiated OpenAI deal, the launch shows Microsoft hedging its OpenAI dependence with a\nfirst-party model family deployed across its biggest products.\n\nParameter count and AIME score for MAI-Thinking-1 come from press coverage, not the official post.","disputed":[],"related":[{"id":"2026-09-13-microsoft-mai-code-of-conduct","url":"https://postcutoff.com/e/2026-09-13-microsoft-mai-code-of-conduct/","date":"2026-09-13","date_precision":"day","short_title":"Nadella puts Microsoft's MAI model \"Code of Conduct\" out for public consultation","deck":null,"takeaway":"A frontier developer opening its model-behavior rules to public consultation is a governance experiment comparable to published model specs/constitutions at other labs.","category":"policy-safety","category_label":"Policy & safety","importance":2,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":1,"official":0,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Microsoft"]},{"id":"2026-04-27-microsoft-openai-deal-restructured","url":"https://postcutoff.com/e/2026-04-27-microsoft-openai-deal-restructured/","date":"2026-04-27","date_precision":"day","short_title":"Microsoft and OpenAI restructure partnership, drop the AGI clause and exclusivity","deck":null,"takeaway":"The change freed Microsoft to push its own first-party MAI models.","category":"business","category_label":"Business","importance":4,"confidence":"medium","status":{"key":"partly","labels":["Partly confirmed"]},"sources":3,"official":0,"filed":"2026-09-29","updated":"2026-09-29","orgs":["Microsoft","OpenAI"]}],"people":[{"id":"mustafa-suleyman","name":"Mustafa Suleyman","url":"https://postcutoff.com/person/mustafa-suleyman/"}],"posts":[],"videos":[],"models":[{"id":"mai-voice-2","name":"MAI-Voice-2 / MAI-Voice-2-Flash","url":"https://postcutoff.com/m/mai-voice-2/"}],"changes":[{"date":"2026-09-29","type":"filed","text":"Created"}],"provenance":{"agents":[{"model":"Claude Opus 5.5","maker":"Anthropic","tool":"Claude Code"}],"filed":"2026-09-29","run":null,"sources_read":null,"updated":"2026-09-29","human_review":null,"version":{"date":"2026-10-04"}},"gaps":[{"model_id":"gpt-6-astra","name":"GPT-6 Astra","cutoff":"2026-04","days_after":33,"in_training_data":false},{"model_id":"claude-opus-5-5","name":"Claude Opus 5.5","cutoff":"2026-06","days_after":null,"in_training_data":true},{"model_id":"gemini-4-hydrogen","name":"Gemini 4 Hydrogen","cutoff":"2026-03","days_after":63,"in_training_data":false},{"model_id":"grok-4-7","name":"Grok 4.7","cutoff":"2026-05","days_after":2,"in_training_data":false}],"short_url":"https://postcutoff.com/s/microsoft-seven-in-house-mai"}