MicrosoftLaunchAI ModelsOctober 15, 2026

Microsoft AI completes pre-training of MAI-Base-2, an 80B-active MoE model

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MAI-Base-2 is an MoE foundation model with 80B active and 2.8T total parameters, which Microsoft says outperforms every open-weight model it tested on held-out evaluations. It is 4-12x more pre-training FLOPs-efficient than DeepSeek-V4-Pro-Base; post-training is ongoing.

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