DotA 6.77b 1.4 AI Map is the official AI released by PBMN together with the AITeam members. The most significant thing about this DotA ai, is the "heavy tweaks to the items system plus AI's having their own courier to bring them the goods. The new heroes got their AI too" PBMN said.
DotA 6.77b 1.4 AI map download link:
DotA v6.77b AI 1.4.w3x