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To describe such cavity-induced effects at atomic resolution, semi-classical molecular dynamics approaches have been developed that treat nuclear motion classically while describing the collective light\u2013matter interaction within the Tavis\u2013Cummings framework of quantum electrodynamics. Here, we benchmark mixed quantum\u2013classical approaches, Ehrenfest dynamics, and Fewest-Switches Surface Hopping (FSSH) for simulating nonadiabatic dynamics of electronically strongly coupled carbon monoxide molecules. Their predictions are compared against numerically exact quantum dynamics simulations performed with the multi-configuration time-dependent Hartree method, which treats both electronic and nuclear degrees of freedom quantum mechanically. We find that the semi-classical approaches reproduce the qualitative features of the full quantum dynamics. Quantitative agreement is best achieved with FSSH when a decoherence correction is included. These results demonstrate that mixed quantum\u2013classical methods provide a computationally efficient and quantitatively reliable alternative to fully quantum simulations for investigating nonadiabatic photochemistry under collective electronic strong coupling in systems beyond the reach of exact quantum treatments.<\/jats:p>","DOI":"10.1063\/5.0332626","type":"journal-article","created":{"date-parts":[[2026,7,23]],"date-time":"2026-07-23T11:23:51Z","timestamp":1784805831000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":0,"title":["Benchmarking mixed quantum\u2013classical molecular dynamics for electronic strong coupling"],"prefix":"10.1063","volume":"165","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4301-9663","authenticated-orcid":false,"given":"Arun Kumar","family":"Kanakati","sequence":"first","affiliation":[{"name":"Nanoscience Center and Department of Chemistry, University of Jyv\u00e4skyl\u00e4 1 , P.O. Box 35, 40014 Jyv\u00e4skyl\u00e4,","place":["Finland"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4629-414X","authenticated-orcid":false,"given":"Oriol","family":"Vendrell","sequence":"additional","affiliation":[{"name":"Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University 2 , Im\u00a0Neuenheimer Feld 229, 69120 Heidelberg,","place":["Germany"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8148-5334","authenticated-orcid":false,"given":"Gerrit","family":"Groenhof","sequence":"additional","affiliation":[{"name":"Nanoscience Center and Department of Chemistry, University of Jyv\u00e4skyl\u00e4 1 , P.O. 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