Fleetfall - Galaxy Domination

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

Artificial intelligence was used to generate the base concepts for planets, store capsule/library art and in-game commander portraits/animations in the game. All generated assets were then significantly edited, refined, and finalized manually to fit the game's unique art style.

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.