I was able to get:
16" M1 Pro: 10C CPU, 16C GPU 32GB RAM, 1TB SSD
16" M1 Max: 10C CPU, 32C GPU, 64GB RAM, 4TB SSD
I did a lot of measurements over a 24 hours period, both laptops with the initial Monterrey 12.3.1 setup, no additional apps installed, both configured from scratch, brand new...