OFFICIAL PAGE: SplitMySong
SplitMySong is an AI-based online service for splitting your audio into four or six stems. All common audio formats are supported, including mp3, ogg, flac, wav, and aiff. Each uploaded file must be between 0.1 and 200 MB in size, and the maximum audio duration is 20 minutes. Various plans are available through Patreon where users can purchase credits to utilize the service. The separated stems can be downloaded in lossless wav format if desired. Full details at the link above.
Screenshot courtesy of Splitmysong.com