OpenAI is rumored to release GPT-5.1 soon (https://www.bleepingcomputer.com/news/artificial-intelligence/openai-plans-to-release-gpt-51-gpt-51-reasoning-and-gpt-51-pro/)

This market tries to narrow down the date range between the day after the question is created (11.Nov) and the end of the year (31.12). If GPT-5.1 is not released by the end of the year, the question resolves as N/A.

Release is decided per the current calendar date in the time zone of San Francisco, during the date/time of the official announcement by OpenAI.