The closest alternative to Hy3 preview is LongCat 2.0 — comparable intelligence (33.5 vs 33.6); and the best open-weight substitute is Kimi K3.
LongCat 2.0 is the closest alternative to Hy3 preview, with an Intelligence Index of 33.5 (Hy3 preview scores 33.6) at $0.300 per million input tokens.
Kimi K3 is the strongest open-weight alternative to Hy3 preview — downloadable from Hugging Face and self-hostable, scoring 57.1 on intelligence.