To cite package ‘ellmercodex’ in publications use:

  Herrera S (2026). _ellmercodex: 'ChatGPT' Plan Provider for
  'ellmer'_. R package version 0.2.0,
  <https://github.com/simxnherrera/ellmercodex>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {ellmercodex: 'ChatGPT' Plan Provider for 'ellmer'},
    author = {Simon Herrera},
    year = {2026},
    note = {R package version 0.2.0},
    url = {https://github.com/simxnherrera/ellmercodex},
  }