Model

MAI-1-preview

CLOSED

Microsoft · MAI family · released Aug 28, 2025

Microsoft AI's first foundation model trained end-to-end in-house (pre+post-trained on ~15,000 H100s); debuted at rank #13 on the LMArena Text leaderboard (per LMArena's own Aug 2025 announcement), the first entry from a new provider into the Top 15. Feeds Copilot text use cases; also offered to trusted testers via API. Context window/param count undisclosed; ctxK is an unconfirmed estimate, not sourced.

ReasoningCodingVisionFunction callingTool useAgentic

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Elo · unrated

Parameters

Undisclosed

Active params

Undisclosed

Context

128K tokens

Architecture

Mixture-of-Experts (MoE) foundation model, total/active params undisclosed

License

Proprietary (Microsoft; not publicly licensed)

Languages

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API price (in/out)

No hosted API

Modalities

text

Benchmark results

Bar shows position within the tracked field; marker = field best

Run it locally

Closed weights — available via API only. No local deployment.

Input / M tok

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Output / M tok

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MAI family

Elo progression across releases

MAI-1-previewAug 20251000.0

Resources

DOCSmicrosoft.ai/news/two-new-in-house-models APIAvailable via Microsoft API

API price — · each benchmark row carries its own source badge (see methodology)