The US has also been trying to keep oil tankers moving through the Strait of Hormuz. American officials believe this has reduced some of the immediate pressure to reach a ceasefire agreement.
OpenAI said some of the activity involved websites belonging to US government agencies, including the Securities and Exchange Commission and the Census Bureau.
US diplomats held direct talks with Houthi representatives in Oman to preserve a ceasefire and keep the Red Sea open, leaving Saudi Arabia to fight the Iran-backed group entirely on its own.