We created two German-only decoder models, LLäMmlein 120M and 1B, from scratch. The project involved several key steps, including extensive data preprocessing, the creation of a custom tokenizer, and optimization of training settings to effectively utilize available hardware. Throughout the training process, various checkpoints were saved and analyzed to monitor the models' learning dynamics. Compared to state-of-the-art models on the SuperGLEBer benchmark, both LLäMmlein models performed compet...