2 ms·Only the first two RPi models (A and B) have 26 pins. The later ones (A+, B+, 2B, Zero, 3B) have 40 pins.by Narishma 11y agoOnly the first two RPi models (A and B) have 26 pins. The later ones (A+, B+, 2B, Zero, 3B) have 40 pins.