OpenAI releases GPT-4.5 research preview

OpenAI has released GPT-4.5 as a research preview, initially available to ChatGPT Pro users and above. The company describes the model as its largest and most knowledgeable yet, with improvements in emotional intelligence, creative brainstorming, and reduced hallucinations on open-domain queries. OpenAI notes that GPT-4.5 is not a frontier reasoning model like o1 or o3-mini; instead, it represents an evolution of the GPT-4o class. Pricing is notably higher than GPT-4o, reflecting increased compute costs. Developers can access the model via the OpenAI API while OpenAI evaluates whether to make it broadly available.