I felt like I had a read on it right away – it's a 6[.0]-series model, and not named after space since it's specialist model, and I assumed it was named after Rosalind Franklin. Looks like the docs back that up, that it's based on Astra, which is not [yet?] at 6.1.
Honestly the names of most of the frontier models are just getting more and more confusing. Maybe this one gets a pass for being a specialist model for bio. But it's hard to decide which model to use at this point, especially OpenAI.