Hello,
Octane and the standard renderer are not nativelly suported yet, they are working to make it possible. Right now Redshift is the only renderer with native Ox hair support. However, there is a workaround to render with other renderers. WIth Arnold and Octane you can convert the hair to curves and render the hair as curves. Add the Curves From Strands operator to the hair object, In Arnold you have to add the Arnold Attributes tag to the hair as well to render the curves as hair, Octane should have a similar tag. Another option is to just convert the hair to polygon mesh using the Mesh From Strands operator.
