The closest alternative to GPT-5.3 Chat is GPT Chat Latest — comparable intelligence (— vs —); for a cheaper option, Qwen3.7 Max runs $1.25/M vs $1.75/M; for more speed, Relace Apply 3 hits 3.1k t/s; and the best open-weight substitute is MiniMax M3.
GPT Chat Latest is the closest alternative to GPT-5.3 Chat, with an Intelligence Index of — (GPT-5.3 Chat scores —) at $5.00 per million input tokens.
Yes — Qwen3.7 Max costs $1.25 per million input tokens versus $1.75 for GPT-5.3 Chat, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to GPT-5.3 Chat — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.