The closest alternative to Gemini 3.1 Flash Lite is Gemini 3.5 Flash — comparable intelligence (43.3 vs —); for a cheaper option, MiMo-V2.5 runs $0.140/M vs $0.250/M; 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 Gemini 3.1 Flash Lite, with an Intelligence Index of 43.3 (Gemini 3.1 Flash Lite scores —) at $1.50 per million input tokens.
Yes — MiMo-V2.5 costs $0.140 per million input tokens versus $0.250 for Gemini 3.1 Flash Lite, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to Gemini 3.1 Flash Lite — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.