Our AI models for sky replacement are constantly evolving to provide the best results in ON1 Photo RAW, the ultimate raw photo editor. We will soon introduce a new model, ‘Model B’, in the upcoming update (free for Photo RAW 2023 owners). Model B offers improved performance and results when replacing certain skies. However, we still recommend using our original ‘Model A’ as the default option. If you encounter a sky that Model A struggles to replace, we recommend giving Model B a try for optimal sky replacement results.