benchmarks: we provide plenty in the over 100 page tech report here
https://github.com/swiss-ai/apertus-tech-report/blob/main/Ap...
quantizations: available now in MLX https://github.com/ml-explore/mlx-lm (gguf coming soon, not trivial due to new architecture)
model sizes: still many good dense models today lie in the range between our small and large chosen sizes