Bing Chat rebranded as Copilot
Microsoft renamed Bing Chat to Copilot and began separating the assistant from the Bing search brand.
What changed
Microsoft announced that Bing Chat and Bing Chat Enterprise would be rebranded under the Copilot name, and moved the assistant to its own destination as well as keeping it inside Bing. For publishers this meant AI answers derived from Bing's index appearing in an increasing number of surfaces, including Windows and Microsoft 365. Microsoft later introduced Copilot Search within Bing in April 2025, blending conventional results with generated answers.
Timing
Rollout began 15 November 2023. No completion date was announced. Rankings typically remain unstable for the whole rollout window, so measurements taken inside it are not a reliable read on the outcome.