Release dates
— Microsoft AI announced that pretraining is complete for MAI-Base-2, a 2.8T-total / 80B-active MoE base model now entering post-training; no user release or public weights are available yet. ↗
MAI-Base-2
Microsoft AI’s 2.8T-parameter MoE base model, with 80B active parameters, has completed pretraining and entered post-training.
Microsoft AI announced on 2026-10-15 that pretraining was complete; the model remains in post-training and is not yet released to users. Microsoft says it plans to license weights to trusted partners through Foundry later.
MODEL NUMBER146
- First public date
- 2026-10-15
- Organization
- Microsoft AI
- Family
- MAI
01
Specifications
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02
Overview
Why it mattered
MAI-Base-2 is the foundation for Microsoft’s next model generation and includes native vision pretraining; this is an important research-stage announcement, not a user-facing release or open-weight publication.
03
Architecture & capabilities
04
Release history
Microsoft AI announced that pretraining is complete for MAI-Base-2, a 2.8T-total / 80B-active MoE base model now entering post-training; no user release or public weights are available yet.
View source05
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06
Sources
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