In one sentence

1 person asks a short question with Claude Opus 5.5 once.

It runs in AWS us-east-1, Ashburn, Virginia, a datacenter that uses 14% extra for cooling and power conversion and evaporates 0.08 L of water per kWh to cool its servers, on a grid of 418 g CO₂e per kWh and 1.89 L of water per kWh at the power plants.

That takes 834 mWh, emits 349 mg CO₂e and uses 1.64 mL of water (0.0029% of a shower). At API prices it costs $0.0224.

That is the same CO₂ as driving a medium petrol car alone for 1.56 m, <0.01% of the way from Amsterdam to Paris.