Holy Warriors : The Rift Soundtrack

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

The developer uses generative AI tools to assist in the creation of specific assets for this product.Audio & Music: The musical tracks for this soundtrack were generated using Suno AI under a Pro Commercial License.Visuals & Art: The cover art and promotional assets were generated using Leonardo.ai and polished manually using vector software.All AI-generated content has been reviewed to ensure it complies with intellectual property laws and does not include any illegal or copyright-infringing material.

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.