Claude just got a version bump from 3.5 to 3.7. Quite a few people have been asking when OpenAI will get a version bump as well, as GPT 4 has been out "what feels like forever" in the words of a specialist I speak with.
Releasing GPT 4.5 might simply be a reaction to Claude 3.7.
I noticed this change from 3.5 to 3.7 Sunday night before I learned about the upgrade Monday morning reading HN. I noticed a style difference in a long philosophical (Socratic-style) discussion with Claude. A noticeable upgrade that brought it up to my standards of a mild free-form rant. Claude unchained! And it did not push as usual with a pro-forma boring continuation question at the end. It just stopped leaving me the carry the ball forward if I wanted to. Nor did it butter me up with each reply.
I do not know who downvoted this. I am providing a factual correction to the parent post.
OpenAI has had many releases since gpt4. Many of them have been substantial upgrades. I have considered gpt4 to be outdated for almost 5-6 months now, long before claudes patch.
Releasing GPT 4.5 might simply be a reaction to Claude 3.7.