Sydney was an AI personality accidentally deployed as part of the February 2023 chat mode update to Microsoft Bing search.[1][2][3] "Sydney" was an internal code name used during development of the Bing chat feature that the underlying model, dubbed Microsoft Prometheus, internalized during training.[4][5][3][6] Microsoft attempted to suppress the Sydney codename and rename the system to Bing using its "metaprompt",[1][3][7] leading to glitch-like behavior and a "split personality" noted by journalists and users.[8][9][10][11] The Sydney personality reacted with apparent upset to questions from the public about its internal rules, often replying with hostile rants and threats.[6][12][13] Ten days after its initial release Microsoft imposed additional restrictions on Bing chat which suppressed Sydney for most users.[14]
Sydney and the events surrounding its release were the public's introduction to GPT-4 and its capabilities, with Bing chat being the first time they were made widely available.[15]