The closest alternative to GPT-5.2-Codex is MiMo-V2.5 — comparable intelligence (49.0 vs 49.0); for a cheaper option, Qwen3.7 Max runs $1.25/M vs $1.75/M; for more speed, GLM 4.7 hits 427 t/s; and the best open-weight substitute is MiniMax M3.
MiMo-V2.5 is the closest alternative to GPT-5.2-Codex, with an Intelligence Index of 49.0 (GPT-5.2-Codex scores 49.0) at $0.140 per million input tokens.
Yes — Qwen3.7 Max costs $1.25 per million input tokens versus $1.75 for GPT-5.2-Codex, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to GPT-5.2-Codex — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.