The closest alternative to Step 3.7 Flash is Kimi K2.6 — comparable intelligence (42.9 vs 42.6); for a cheaper option, MiMo-V2.5 runs $0.140/M vs $0.200/M; for more speed, GLM 4.7 hits 427 t/s; and the best open-weight substitute is MiniMax M3.
Kimi K2.6 is the closest alternative to Step 3.7 Flash, with an Intelligence Index of 42.9 (Step 3.7 Flash scores 42.6) at $0.680 per million input tokens.
Yes — MiMo-V2.5 costs $0.140 per million input tokens versus $0.200 for Step 3.7 Flash, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to Step 3.7 Flash — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.