The closest alternative to Llama 3.1 8B Instruct is Llama Guard 4 12B — comparable intelligence (— vs —); for a cheaper option, gpt-oss-120b runs $0.037/M vs $0.050/M; and the best open-weight substitute is Kimi K3.
Llama Guard 4 12B is the closest alternative to Llama 3.1 8B Instruct, with an Intelligence Index of — (Llama 3.1 8B Instruct scores —) at $0.180 per million input tokens.
Yes — gpt-oss-120b costs $0.037 per million input tokens versus $0.050 for Llama 3.1 8B Instruct, while staying within ~8 points of its Intelligence Index.
Kimi K3 is the strongest open-weight alternative to Llama 3.1 8B Instruct — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.