The closest alternative to GLM 5.1 is KAT-Coder-Pro V2 — comparable intelligence (43.8 vs 43.8); for a cheaper option, MiniMax M3 runs $0.300/M vs $0.980/M; for more speed, GLM 4.7 hits 452 t/s; and the best open-weight substitute is MiniMax M3.
KAT-Coder-Pro V2 is the closest alternative to GLM 5.1, with an Intelligence Index of 43.8 (GLM 5.1 scores 43.8) at $0.300 per million input tokens.
Yes — MiniMax M3 costs $0.300 per million input tokens versus $0.980 for GLM 5.1, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to GLM 5.1 — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.