OpenAI has a new reasoning model called o3-pro that the company says is its most intelligent yet. On Tuesday the ChatGPT maker announced o3-pro on X, sharing some details on its improvement over o3.

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OpenAI’s ChatGPT model is a closed AI model. This means that developers cannot tinker under the hood, and if they want to use it for their own purposes, they’d have to pay OpenAI for API access.