ScarJo claims they reached out to her just 2 days prior to demoing the voice that sounded like her, and (I believe) OpenAI outright claimed that they hired a different voice actor, though they didn't admit that they instructed her to try to sound like Scarlett's character in Her, which could make or break Scarlett's case.
ScarJo claims they reached out to her far earlier when she rejected them and the 2 days prior to launch was a an attempted follow-up by OAI that didn't happen.