At Google I/O, Google unveiled LaMDA (Language Model for Dialogue Applications), a family of Transformer-based language models fine-tuned for open-ended conversation rather than generic text generation. Sundar Pichai said it was open-domain, designed to converse on any topic; demos had it speaking in the persona of Pluto and of a paper airplane. Google also announced MUM (Multitask Unified Model), a multimodal model trained across more than 75 languages that could work across text, images, and video. Google had a model capable of open-ended conversation at this point but did not release it broadly as a product, showing it only in demos. ChatGPT would appear a year and a half later.