This resolves to the percentage of the year left when OpenAI releases GPT-5. For example, if it is announced at 00:01 on the 31st of December, 1 day will remain out of 365, so this would resolve to (1/365) = 0.27%.

If it is not released in 2025, this resolves to 0%.

This is for a relatively public release of any form. Access only through ChatGPT or only through the API would count.

Here is the question for announcedment rather than release: