I was curious and went to look up how low it was, and the references I can find online say that the ISS, the Space Shuttle, and the Crew Dragon are all at 1 atm.

It does say that the pressure in the Space Shuttle was decreased to about 70% atm for 24h before EVA.

Apollo was 1/3 atm 100% oxygen.

https://en.wikipedia.org/wiki/International_Space_Station

https://space.stackexchange.com/questions/5690/why-is-the-br...

https://www.google.com/search?q=pressure+inside+the+space+sh...

https://www.google.com/search?q=pressure+inside+the+apollo+c...