Actually, nevermind... this looks more like Anthropic and xAI coincided due to shared xAI infra (6:23am and 6:30am), and OpenAI's issue was more likely then a coincidence (7:43am).
Thank you. This should be pinned or something.
xAI mentioned a Memphis outage, which is where Anthropic was leasing capacity on Colossus 1. I do think this is the explanation.