TL;DROpenAI is retiring its GPT-4.5 and OpenAI o3 models.These models are currently only available to paid ChatGPT subscribers.GPT-4.5 will be available through most of June; OpenAI o3 is shutting down in August.OpenAI is retiring the last of its previous-gen ChatGPT models. GPT-4.5, the sole remaining GPT-4 model available to end users, is officially going away in about a month, at the end of June.As spotted by TechRadar, OpenAI quietly announced that it’s begun sunsetting both the OpenAI o3 and GPT-4.5 in its latest ChatGPT release notes this week. GPT-4.5 will be retired next month; OpenAI o3 is sticking around until August.