MAI-Thinking-1

Claims and evidence

• Announced 2 June 2026Announced as one of seven MAI models; at announcement it was offered only as a private preview in Microsoft Foundry. ● Primary source[1]Our Models [2]dateline; Availability and access
• Released 12 August 2026Public preview in Microsoft Foundry. Before that, access was a private preview on request from 2026-06-02 (see milestones). ● Primary source[3]dateline; Updated as of August 12, 2026
• Private preview in Microsoft Foundry 2 June 2026The June version of the announcement says it is available in private preview on Microsoft Foundry that day; the model card describes early access through an interest form. ● Primary source[2]Availability and access [5]Distribution channels

• Status PreviewPublic preview in Microsoft Foundry since 2026-08-12; no general availability found up to 2026-10-01. ● Primary source[6]heading; MAI-Thinking-1 at a glance [7]Microsoft models sold by Azure: MAI-Thinking-1 [3]Availability and access

• Input text ● Primary source[5]Technical specs: Input formats [7]MAI-Thinking-1: Capabilities
• Output textThe model card leaves output formats unspecified; the Foundry models page lists text output of up to 64,000 tokens. ● Primary source[7]MAI-Thinking-1: Capabilities
• Feature Reasoning modeMicrosoft AI calls it a reasoning model; the API can return an encrypted reasoning state. ● Primary source[3]first paragraphs [6]introduction; Preserve reasoning state across turns
• Feature Function calling ● Primary source[3]Enterprise ready [6]Use function calling and tools
• Context window 256,000 tokens tokensThe how-to page, model card and technical report write 256K and the announcement 256k; output is capped at 64K tokens. ● Primary source[7]MAI-Thinking-1: Context length [6]Token limits and context window [3]Enterprise ready [4]1 Introduction
• Parameters c. 35B-active, ~1T-totalSparse mixture-of-experts. The value is the total; the technical report writes 35B active / 1T total without the tilde. ● Primary source[3]Medium-sized model, with strong software engineering performance [4]Abstract; 2 Pre-training
• Access APIThrough Microsoft Foundry (GlobalStandard deployment, chat completions API). ● Primary source[3]Availability and access [6]Prerequisites

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