The closest alternative to Llama Guard 4 12B is Llama 4 Maverick — comparable intelligence (14.3 vs —); for a cheaper option, GPT-5.6 Luna runs $0.100/M vs $0.180/M; and the best open-weight substitute is Kimi K3.
Llama 4 Maverick is the closest alternative to Llama Guard 4 12B, with an Intelligence Index of 14.3 (Llama Guard 4 12B scores —) at $0.200 per million input tokens.
Yes — GPT-5.6 Luna costs $0.100 per million input tokens versus $0.180 for Llama Guard 4 12B, while staying within ~8 points of its Intelligence Index.
Kimi K3 is the strongest open-weight alternative to Llama Guard 4 12B — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.