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

Microsoft has confirmed that OpenAI has been utilizing Looped Transformers within the GPT-6 series, corroborating earlier reports from The Information. This confirmation was initially found on a publicly accessible Microsoft webpage. An update to the webpage later removed this information. It is suggested that "same base model weights as GPT-6 Sol" implies that GPT-6 and GPT-6.1 are post-trained models built upon the same pre-trained base model, rather than having identical final weights.

This report confirms The Information's earlier reporting on OpenAI's use of Looped Transformers in the GPT-6 series, unlike other accounts that lacked direct confirmation.