The closest alternative to DeepSeek V3.1 is Qwen3 Coder Next — comparable intelligence (28.3 vs 28.1); for a cheaper option, MiMo-V2.5 runs $0.140/M vs $0.210/M; for more speed, gpt-oss-120b (free) hits 554 t/s; and the best open-weight substitute is MiniMax M3.
Qwen3 Coder Next is the closest alternative to DeepSeek V3.1, with an Intelligence Index of 28.3 (DeepSeek V3.1 scores 28.1) at $0.110 per million input tokens.
Yes — MiMo-V2.5 costs $0.140 per million input tokens versus $0.210 for DeepSeek V3.1, while staying within ~8 points of its Intelligence Index.
MiniMax M3 is the strongest open-weight alternative to DeepSeek V3.1 — downloadable from Hugging Face and self-hostable, scoring 54.7 on intelligence.