It describes GPT-4.5 as a research preview and not a frontier model. Later this year, OpenAI expects to introduce GPT-5 as a single that handles quick chat requests and more intensive reasoning ...

OpenAI will soon retire GPT-4, an AI model it launched over two years ago, from ChatGPT, according to a changelog posted on Thursday. Effective April 30, GPT-4 will be “fully replaced” by GPT ...