New Delhi: OpenAI has released research preview of GPT-4.5 its largest and best model for chat yet for ChatGPT Pro users and developers worldwide. ChatGPT Pro users will be able to select GPT-4.5 in the model picker on web, mobile and desktop. We will begin rolling out to Plus and Team users next week, then to Enterprise and Edu users the following week, said the US-based OpenAI. According to the Sam Altman-run company, GPT-4.5 is a step forward in scaling up pre-training and post-trainin