["Journal of Traumatic Stress, EarlyView. ", "\nAbstract\nWe developed resilience using language modeling (ReLM) to measure resilience in language through a novel natural language processing approach called archetype analysis. Our model conceptualizes resilience as a process of maintaining healthy functioning after an adverse event. ReLM is theoretically synthesized through nine facets of resilience reviewed from various sources as reflected in language that captures its dynamic capacity: optimism, sense of social support, emotional maturity, uncertainty tolerance, flexible mindset, coping toolkit, cognitive reappraisal, belief in a higher power, and continued activities of daily living. ReLM uses a language model to embed language in a semantic space, with cosine similarity to each facet's prototype statements calculated to quantify a theoretically derived facet score. We applied ReLM to 1,859 voicemails collected from 211 responders to the September 11, 2001, World Trade Center terrorist attacks. Principal component analysis on training and test sets identified a single latent factor from the facet scores, λ = 5.02 (56% variance explained), and measurement invariance testing confirmed scalar invariance across training and test subsets, Δχ2(8) = 8.89, p = .352, indicating ReLM scores reflected the same underlying construct in both sets. A one‐way analysis of variance showed significant differences in posttraumatic stress disorder (PTSD) symptom trajectories across resilience quartiles, F(3, 169) = 5.18, p = .002, with high resilience showing the largest improvements in PTSD after 4 years (M = −0.212). Using an archetype‐based language model, ReLM offers a theoretically grounded approach to measuring resilience through natural language, capturing psychological processes in narratives, and enabling dynamic assessment.\n"]