CSGP ▼ -0.7% - CoStar Group, Inc. $CSGP - OpenAI Features Apartments.com in GPT-6 Astra Apartment-Hunting Demo CoStar Group's Apartments.com platform was featured in OpenAI's GPT-6 Astra apartment-hunting demonstration, showcasing the property listing service's integration with advanced AI capabilities. The stock declined 0.7% today, despite the visibility the feature provides to one of CoStar's key revenue-generating properties. 08-SEP-2026 09:08 AM ET