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Here, we develop and benchmark spin\u2013orbit quasidegenerate second-order N-electron valence perturbation theory (SO-QDNEVPT2) for g-tensor calculations, treating dynamical correlation and spin\u2013orbit effects consistently within a multistate effective Hamiltonian (EH) framework. Two g-tensor approaches are implemented: a spin-free EH approach based on second-order response and a Kramers (K) approach that extracts g from spin-mixed SO-QDNEVPT2 states. We assess their performance on a benchmark set of 23 molecules spanning diatomics and small polyatomics, low- to high-spin species, and weak to strong spin\u2013orbit coupling. Across the dataset, SO-QDNEVPT2 improves agreement with experiment relative to state-averaged complete active-space self-consistent field. The EH and K formalisms agree for modest g-shifts, but the K approach becomes essential when the shifts become large. We demonstrate that QDNEVPT2 results can be sensitive to intruder-state instabilities that can be effectively mitigated with level-shift or renormalization techniques. We then analyze the dependence of SO-QDNEVPT2 results on key computational parameters, including active space, number of states, state-averaging weights, gauge origin, and basis set. These results establish SO-QDNEVPT2 as a robust framework for computing g-tensors in correlated, relativistic open-shell molecules, offering practical guidelines for its applications.<\/jats:p>","DOI":"10.1063\/5.0330438","type":"journal-article","created":{"date-parts":[[2026,5,6]],"date-time":"2026-05-06T11:44:32Z","timestamp":1778067872000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Molecular\n                    <i>g<\/i>\n                    -tensors from spin\u2013orbit quasidegenerate\n                    <i>N<\/i>\n                    -electron valence perturbation theory: Benchmarks, intruder-state mitigation, and practical guidelines"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0009-0003-4045-4576","authenticated-orcid":false,"given":"Nicholas Yiching","family":"Chiang","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-5500-8257","authenticated-orcid":false,"given":"Rajat","family":"Majumder","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2637-4134","authenticated-orcid":false,"given":"Alexander Yu.","family":"Sokolov","sequence":"additional","affiliation":[{"name":"Department of Chemistry and Biochemistry, The Ohio State University , Columbus, Ohio 43210,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,5,6]]},"reference":[{"key":"2026050607442876800_c1","volume-title":"Electron Paramagnetic Resonance of Transition Ions","year":"2012"},{"key":"2026050607442876800_c2","doi-asserted-by":"publisher","first-page":"906","DOI":"10.1038\/s41578-021-00306-y","volume":"6","year":"2021","journal-title":"Nat. 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