Nicolas Bustamante (@nicbstme)

Claude Fable 5 is back! I always run plenty of evals, but the most telling is always random things like "design in code a realistic Eiffel Tower." Fable 5 is a special model. I don't know how to best describe it, but "it gets it." Fable 5 excels at one-shotting things based on a vague prompt.

When people say data centers use millions of gallons of water, they're describing an old technology. Before, water went into evaporative cooling towers. Warm water pulled heat off the AI chips, then evaporated into the air to shed it. It was effective, but it burned through fresh water continuously, which is where the headline numbers come from today around "data centers use a massive amount of water." The data centers we revealed at Build today don't work that way. The cooling loop is closed. Water is added once during construction and recirculates indefinitely between the servers and the chillers. No evaporation, no fresh-water resupply! Satya put the scale in plain terms: a full year of water use is roughly what a single restaurant uses. Keep in mind that for us, every liter and every watt is an optimization target. The economics and the environment push in the same direction!