But it could be the last release in OpenAI's classic LLM lineup.

Some researchers think OpenAI's giant and expensive latest model is a sign that tech companies cannot keep making progress by continually scaling up

OpenAI is launching GPT-4.5 today, its newest and largest AI language model. GPT-4.5 will be available as a research preview for ChatGPT Pro users to start. OpenAI is calling the release its “most knowledgeable model yet,” but initially warned that GPT-4.5 is not a frontier model and might not perform as well as o1 or o3-mini.

Internally called Orion, GPT-4.5 is OpenAI’s largest model to date, and it’s first available through the company’s $200 monthly ChatGPT subscription.

PT: Hours after GPT-4.5's release, OpenAI removed a line from the AI model's white paper that said "GPT-4.5 is not a frontier AI model."

After GPT-4.5, subsequent models updates will incorporate OpenAI's o-series reasoning capabilities into one simplified experience for ChatGPT. This is a change from the confusing word salad OpenAI's offerings have become like GPT-4o, GPT-40 with scheduled tasks, o1, o3-mini, and o3-mini-high.

OpenAI researchers said the new model was the company’s “best chat model yet,” citing an improved knowledge base and better contextual understanding.

OpenAI rolled out a research preview of GPT-4.5, it's "largest and most knowledgeable model yet," on Thursday.

OpenAI says GPT-4.5 is smarter and offers a broader bank of knowledge, higher accuracy, lower hallucination, and access to the latest information on the web.The Latest Tech News, Delivered to Your Inb

OpenAI has introduced GPT-4.5, its largest AI model to date, code-named Orion. The model, trained with more computing power and data than any previous OpenAI release, is available as a research preview to select users.

OpenAI has unveiled GPT-4.5, its most advanced Artificial Intelligence (AI) language model to date. As of now, the new model is available as a research preview for ChatGPT Pro users and developers worldwide.