The closest alternative to MiniMax M3 is DeepSeek V4 Pro — comparable intelligence (44.3 vs 44.4); for a cheaper option, GPT-5.6 Luna runs $0.100/M vs $0.300/M; and the best open-weight substitute is Kimi K3.
DeepSeek V4 Pro is the closest alternative to MiniMax M3, with an Intelligence Index of 44.3 (MiniMax M3 scores 44.4) at $0.435 per million input tokens.
Yes — GPT-5.6 Luna costs $0.100 per million input tokens versus $0.300 for MiniMax M3, while staying within ~8 points of its Intelligence Index.
Kimi K3 is the strongest open-weight alternative to MiniMax M3 — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.