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On the 30th local time, OpenAI announced that it would open the speech mode (Alpha version) of GPT-4o to some ChatGPT Plus users, and will gradually promote it to all ChatGPT Plus subscribers this fall. In May this year, Mira Murati, chief technology officer of OpenAI, mentioned in a speech: In GPT-4o, we trained a new end-to-end unified model across text, vision, and audio, which means that all inputs and outputs are generated by the same neural network.