The closest alternative to Gemini 2.5 Flash Lite is Hermes 3 405B Instruct (free) — comparable intelligence (17.6 vs 17.6); for a cheaper option, Nemotron 3 Ultra (free) runs Free/M vs $0.100/M; for more speed, Mercury 2 hits 456 t/s; and the best open-weight substitute is MiniMax M3.
Hermes 3 405B Instruct (free) is the closest alternative to Gemini 2.5 Flash Lite, with an Intelligence Index of 17.6 (Gemini 2.5 Flash Lite scores 17.6) at Free per million input tokens.
Yes — Nemotron 3 Ultra (free) costs Free per million input tokens versus $0.100 for Gemini 2.5 Flash Lite, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to Gemini 2.5 Flash Lite — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.