The OP12GZ operates from a single or split supply with a total span of 40 V (minimum and maximum both listed at 40 V). This means it can run from a single 40 V rail or from ±20 V supplies, which is uncommon for a general-purpose op-amp and gives headroom for industrial sensor interfaces, actuator drivers, and military 28 V bus systems without needing an external regulator.
Input bias and offset — adequate for general-purpose signal conditioning
With a maximum input bias current of 3 nA and input offset voltage of 350 µV, the OP12GZ is not a precision amplifier, but these figures are fine for buffering, filtering, level shifting, and gain stages where the signal is in the millivolt range or higher. The bias current is low enough that it won't load high-impedance sources like 10 kΩ thermistors or photodiodes significantly.