@article{mechanisticoriginsofcatastrophicforgetti, title = {Mechanistic origins of catastrophic forgetting: why RL preserves circuits better than SFT?}, author = {Jeanmely Rojas Nunez and Viraj Sawant and Nathan Allen and Nomgondalai Amgalanbaatar and Yannis Zongo and Vasu Sharma and Maheep Chaudhary}, year = {2026}, eprint = {2605.28860}, archivePrefix = {arXiv}, url = {https://arxiv.org/abs/2605.28860}, }