Sam Altman — Website: https://blog.samaltman.com/

The source is a Wikidata entry (Q7407093) for Sam Altman that contains biographical information such as birth date, place of birth, occupations, education, and positions held. However, it does not include any field or statement about his personal website or blog URL. The claim references a specific website (https://blog.samaltman.com/), but this information is simply not present in the provided source text. Without the source addressing this claim at all, it cannot be verified or contradicted based on this document.