Your mesh size was something about 1 meter height...
I think you should add 1x subdiv for your mesh as my result below
Smoothing problem in v1.11
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The scene is from Poser that's why it's in Poser units 
Although I have moved to decameters for Poser scenes now as it gives less shadow problems.
But as Face mentioned to fix my problem was to drop the normals and subdivide the mesh. Poser can handle low poly meshes but Octane can't.
Although I have moved to decameters for Poser scenes now as it gives less shadow problems.But as Face mentioned to fix my problem was to drop the normals and subdivide the mesh. Poser can handle low poly meshes but Octane can't.
Win 11 Pro | i5 12600K | 32GB ram | 2x GTX 1080Ti + 3080Ti - studio driver 560.94| Modo/Blender/ZBrush/Daz/Poser