On a base install, from pulp.apis.listSolvers(onlyAvailable=True) you will get ['PULP_CBC_CMD']. If you try to run this on any simple example with problem.solve(pulp.PULP_CBC_CMD("problem_name")) you will get:

OSError: [Errno 86] Bad CPU type in executable: '/Users/my_name/.pyenv/versions/conway/lib/python3.13/site-packages/pulp/apis/../solverdir/cbc/osx/i64/cbc'

I spent hours trying to solve this. If you search for "python pulp OSError: [Errno 86] Bad CPU type in executable" you will find lots of open threads with suggestions ranging from "use Rosetta" to straight-up trampling the binary on an installation-by-installation basis.

To the best of my knowledge, this isn't documented anywhere. I answered the top search result on SO and the solution is remarkably simple.

If I am missing the reference in the documentation, please direct me to it so I can include it in my answer (and perhaps it needs to be more prominent). If it is missing from the documentation, I'm happy to put in a PR to provide a brief guide on the issue (but please tell me where you think it should live). Finally, I'm not sure if this constitutes a bug, given that the binary being distributed simply won't run on my M4 chip (and seemingly others) and this is unexpected behaviour, particularly for people unfamiliar with all the different solvers that are being wrapped.