OpenAI has launched GPT-4.1, a new family of generative multimodal AI models that can handle 1 million tokens of context. This release includes three versions: GPT-4.1, GPT-4.1 mini, and GPT-4.1 nano, with the latter being described as the smallest and fastest model. Improvements from GPT-4.1 will be integrated into ChatGPT, while the previous model, GPT-4, will be phased out by April 30th.