Path of Idle: Old Gods Rising

The developers describe how their game uses AI generated content like this:

About 10% of this game’s art assets were created with AI-assisted design, including some combat scenes and talent icons. All AI-generated content was reviewed, adjusted, and polished by artists. The remaining art assets were hand-crafted.

Required on Steam store pages since 2024. It covers content that ships in the game, on its store page or in its marketing — Valve does not require a disclosure for AI tools used during development, so this says nothing either way about how the game was made. Check it on Steam.