When GPT-4 came out, I tried for a while to use it to write a story. It was kinda fun, but ultimately I decided that the story was bad, and using GPT-4 was making it worse. (I'd be happy to give more details/examples in the comments if curious.) When GPT-5 comes out I'm going to try again.

If, in my subjective opinion, it's a potent tool that actually helps me write fiction, this market resolves YES. If I judge it to be insufficiently good, like I did for v4, it resolves NO. This market only resolves at the point where we have a model from Open AI that is either called GPT-5 or is "clearly GPT-5 with a different name" according to my subjective opinion. The market also only resolves once I've had the opportunity to use it for a while to try to write fiction. (I expect to try this shortly after launch, but I might be busy such that it takes me some months to really try.) If OpenAI ceases to exist this resolves NO.

I won't bet.