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OpenAI will retire its GPT-4 model from ChatGPT on April 30th, replacing it with the superior GPT-4o. GPT-4o consistently outperforms GPT-4 in various tasks and has improved instruction following and problem-solving. GPT-4 will remain accessible via OpenAI's API. The retirement follows the release of GPT-4 Turbo and anticipates the launch of new models, including the GPT-4.1 family and o3/o4 reasoning models. GPT-4's retirement comes amidst ongoing copyright disputes with publishers.

Prepared by Jonathan Pierce and reviewed by editorial team.