OpenAI Retires GPT-4.5 Model from ChatGPT Website and API

OpenAI has officially removed the GPT-4.5 model from both the ChatGPT website and API as of August 2025. This change coincides with the release of GPT-5, launched on August 7, 2025, marking a significant update to the company’s AI offerings. As part of these changes, several older models—namely GPT-4.5, GPT-4o, GPT-4.1, among others—have been retired from all…