Results returned by get_entries_in_chensys() are different in Pymatgen and MP API are different

Materials Project Materials Project Data/API
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1

Although I use the same arguments in both cases, get_entries_in_chemsys(elements_list, additional_criteria={“thermo_types”: [“GGA_GGA+U_R2SCAN”]}, compatible_only=True),
I find that the sets of entries returned have some overlap but are different. I think the arguments to Pymatgen are simply passed on to MP.

Which is the more reliable one to use? MP-API or Pymatgen? Thank you.

2

We only provide support for the mp_api package and recommend using that to ensure that you are able to access all features of the API / MP’s databases.