Bing Search Menu Tests Chat Button That Says Chat w/GPT-4 & Copilot

Bing Search has placed the "Chat" button in its top search menu since Bing Chat launched. But now Bing is testing expanding it to read "Chat w/GPT-4" and "Copilot." We know Microsoft is ultimately rebranding Bing Chat to Copilot, so that is expected but w/GPT-4 is not....