  Here we present the first open-source radiative transfer model for computing
the reflected light of exoplanets at any phase geometry, called PICASO:
Planetary Intensity Code for Atmospheric Scattering Observations. This code,
written in Python, has heritage from a decades old, well-known Fortran model
used for several studies of planetary objects within the Solar System and
beyond. We have adopted it to include several methodologies for computing both
direct and diffuse scattering phase functions, and have added several updates
including the ability to compute Raman scattering spectral features. Here we
benchmark PICASO against two independent codes and discuss the degree to which
the model is sensitive to a user's specification for various phase functions.
Then, we conduct a full information content study of the model across a wide
parameter space in temperature, cloud profile, SNR and resolving power.
