The closest alternative to GPT-4o (2024-08-06) is Qwen2.5 72B Instruct — comparable intelligence (9.6 vs 9.6); for a cheaper option, GPT-5.6 Terra runs $1.25/M vs $2.50/M; and the best open-weight substitute is Kimi K3.
Qwen2.5 72B Instruct is the closest alternative to GPT-4o (2024-08-06), with an Intelligence Index of 9.6 (GPT-4o (2024-08-06) scores 9.6) at $0.360 per million input tokens.
Yes — GPT-5.6 Terra costs $1.25 per million input tokens versus $2.50 for GPT-4o (2024-08-06), while staying within ~8 points of its Intelligence Index.
Kimi K3 is the strongest open-weight alternative to GPT-4o (2024-08-06) — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.