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OpenAI plans to remove its GPT-4 language model from ChatGPT on April 30, according to a recent changelog announcement. The company will replace it entirely with GPT-4o, which OpenAI says performs better than the original model across writing, programming, and STEM tasks. While GPT-4 will disappear from ChatGPT, developers can still access it through OpenAI's API. The 2023 model, which CEO Sam Altman indicated cost over $100 million to develop, remains at the center of several ongoing copyright disputes, including a lawsuit from the New York Times.

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OpenAI has introduced an Evals API that enables programmatic test creation and automation. The system lets developers integrate evaluations directly into their workflows while maintaining the same configuration options available in OpenAI's dashboard interface. Through API calls, teams can define test parameters, manage evaluation data, and rapidly refine prompts. While the API works with models from other companies, those models must support OpenAI's "Chat Completions API" format. Technical documentation is available in both the OpenAI Cookbook and API documentation.

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