The closest alternative to GPT-5.4 Nano is GLM 5.1 — comparable intelligence (43.8 vs 44.0); 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.
GLM 5.1 is the closest alternative to GPT-5.4 Nano, with an Intelligence Index of 43.8 (GPT-5.4 Nano scores 44.0) at $0.980 per million input tokens.
Yes — MiMo-V2.5 costs $0.140 per million input tokens versus $0.200 for GPT-5.4 Nano, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to GPT-5.4 Nano — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.