GPT-4o ("o" for "omni") is a multilingual, multimodal generative pre-trained transformer developed by OpenAI and released in May 2024. GPT-4o is free, but with a usage limit that is five times higher for ChatGPT Plus subscribers. It can process and generate text, images and audio. Its application programming interface (API) is twice as fast and half the price of its predecessor, GPT-4 Turbo.

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