The closest alternative to Lyria 3 Pro Preview is Gemini 3.5 Flash — comparable intelligence (43.3 vs —); for more speed, Relace Apply 3 hits 3.1k t/s; and the best open-weight substitute is MiniMax M3.
Gemini 3.5 Flash is the closest alternative to Lyria 3 Pro Preview, with an Intelligence Index of 43.3 (Lyria 3 Pro Preview scores —) at $1.50 per million input tokens.
MiniMax M3 is the strongest open-weight alternative to Lyria 3 Pro Preview — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.