that's what their frozen models are for. For example, I could use gpt-4-0314 or gpt-4-0613 or the current version - simply "gpt-4" Those numbers appended at the

that's what their frozen models are for. For example, I could use gpt-4-0314 or gpt-4-0613 or the current version - simply "gpt-4" Those numbers appended at the end indicate snapshots of the model at a particular stage in development. It isn't perfect, since model versions get discontinued over time, but it is something.