A tweet made starting with a capital letter makes this resolve YES.

Otherwise resolves NO at EOY.

Pure retweets do not count, but quote tweets starting with a text written by Sam does.

Resolution seems unambiguous enough, I might trade in this market.

Sam Altman retweeting the below (as he did) would not resolve to YES.

This would resolve to YES, were he to do it again after market creation (Sep 30 2024).

• Update 2025-01-01 (PST): - Resolution Timing: The market will resolve now unless someone objects, instead of at the end of the year. (AI summary of creator comment)