Comment by dminik

I mean, they did the "confidential S1 filing" thing a few days apart.

Anthropic on 1st June: https://www.anthropic.com/news/confidential-draft-s1-sec

OpenAI shortly before June 8: https://openai.com/index/openai-submits-confidential-s-1/

That was less than a month ago. They seemed to be on a similar pace at least from my point of view.