Google's[2][3][4] Keyword post is dated "Sep 04, 2026" and says "Lyria 3.5, our best-sounding music generation model, is now available in the Gemini app and the Gemini API"; The Next Web[5] reported it on 4 September. The Gemini API changelog files the API's general availability a day earlier, under September 3.
Google puts Lyria 3.5, its best-sounding music generation model, into the Gemini app for all users worldwide and into the Gemini API, generating full songs with vocals and lyrics at 44.1 kHz from text or images for $0.08 a song.