"Karu wrote: Octane is a spectral renderer and doesn't render internally in any RGB color space (i.e. there is no working space). It can be considered to output directly in the color space chosen, be that ACEScg, ACES2065-1 or any other space available.
But in the case of ACES, as in the ACES documentation and several articles on the subject says , in most engines you would have to specify the texture input like Utility-linear etc...