The closest alternative to GPT-5.4 Mini is GLM 4.6V — comparable intelligence (23.4 vs 23.3); for a cheaper option, MiniMax M3 runs $0.300/M vs $0.750/M; for more speed, gpt-oss-120b (free) hits 554 t/s; and the best open-weight substitute is MiniMax M3.
GLM 4.6V is the closest alternative to GPT-5.4 Mini, with an Intelligence Index of 23.4 (GPT-5.4 Mini scores 23.3) at $0.300 per million input tokens.
Yes — MiniMax M3 costs $0.300 per million input tokens versus $0.750 for GPT-5.4 Mini, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to GPT-5.4 Mini — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.