Microsoft confirms OpenAI has been using Looped Transformers in the GPT-6 series

Microsoft confirms on publicly accessible web page that OpenAI has been using Looped Transformers in the GPT-6 series, proving The Information's reporting was correct all along.

GPT-6.1 Sol uses 2 inference passes, with a passing mention of "instead of three".

For those confused by "same base model weights as GPT-6 Sol", I think Microsoft meant 6 & 6.1 are both post-trained models on top of the same pre-trained "base model", not that the final weights are identical

So different post-training (+ one less loop).

Update: Microsoft updated the web page to remove it