The field of Artificial Intelligence, particularly large language models, sees rapid advancements and releases. The question asks which AI model was released recently, implying a significant new iteration in the GPT series. The correct answer is GPT-5.
OpenAI's GPT series are leading generative AI models. While GPT-4 was a major release in March 2023, and GPT-4o (an 'omni' model) was released in May 2024, the question implies the next generational leap. As of late 2024 and early 2025, GPT-5 is the anticipated or very recently released next-generation model, representing the newest major iteration in the series. GPT-4.5 is not an official public release name for a major model. GPT-6 is a future iteration that has not yet been released or widely announced, making GPT-5 the most appropriate answer for a 'recently released' next-gen model among the choices.