χhem-GPT Series of Models

This is the release of the open source/weights models for the χhem-GPT series of models. These models should be used with the open source library Transform Your World https://github.com/lanl/Transform-Your-World) to operate most effectively. GPT 1:Provided are a set of models as documented in "Generative Chemical Language Models forEnergetic Materials Discovery" (DOI: TBD). GPT 2:See chem_gpt_2/group/**model_card.md for details. Copyright Disclosure These models are open source and released under a MIT License with O# O5008. See LICENSE.txt © 2026. Triad National Security, LLC. All rights reserved. This program was produced under U.S. Government contract 89233218CNA000001 for Los Alamos National Laboratory (LANL), which is operated by Triad National Security, LLC for the U.S. Department of Energy/National Nuclear Security Administration. All rights in the program are reserved by Triad National Security, LLC, and the U.S. Department of Energy/National Nuclear Security Administration. The Government is granted for itself and others acting on its behalf a nonexclusive, paid-up, irrevocable worldwide license in this material to reproduce, prepare derivative works, distribute copies to the public, perform publicly and display publicly, and to permit others to do so.