Billed as OpenAI’s “last non-chain-of-thought model,” GPT-4.5 is the company’s most advanced language model to date. OpenAI says the model offers substantial enhancements over its predecessors, particularly in advanced reasoning, problem-solving, and contextual understanding.
According to OpenAI, improvements include: superior capabilities in handling complex, multi-step reasoning tasks with increased accuracy and efficiency; enhanced creativity and flexibility; and adeptly managing intricate logic problems and maintaining nuanced, multi-turn conversations with improved contextual recall. Additionally, the model is said to integrate real-time information more seamlessly, dynamically processing and incorporating new data into its responses. The company also claims that safety measures have been bolstered, with GPT-4.5 showing a heightened ability to interpret instructions accurately while adhering to ethical guidelines.
OpenAI estimates that GPT-4.5 is at least 30 times more expensive to run than GPT-4o. Where will the power and the chips come from? Not to worry: this is where GPT-5 will come in. OpenAI CEO Sam Altman said, “A top goal for us is to unify o-series models and GPT-series models by creating systems that can use all our tools, know when to think for a long time or not, and generally be useful for a very wide range of tasks.”
GPT-4.5 is available for ChatGPT Pro subscribers and developers. Paid subscribers to lower tier plans will get access next week.
OpenAI’s current strategy is clear: “We believe reasoning will be a core capability of future models, and that the two approaches to scaling — pre-training and reasoning — will complement each other. As models like GPT‑4.5 become smarter and more knowledgeable through pre-training, they will serve as an even stronger foundation for reasoning and tool-using agents.”
Author’s note: This is not a sponsored post. I am the author of this article and it expresses my own opinions. I am not, nor is my company, receiving compensation for it. This work was created with the assistance of various generative AI models.