Feb 27 (Reuters) - ChatGPT developer OpenAI said on

Thursday it has released a research preview of its latest

GPT-4.5 model for its Pro users and developers worldwide, with

plans to expand access in the coming weeks.

GPT-4.5 comes with improved ability to recognize patterns,

generate creative insights without reasoning and shows greater

emotional intelligence, the company said.

Microsoft ( MSFT )-backed OpenAI said it would begin rolling out

GPT-4.5 to ChatGPT Plus and Team users next week, and then to

Enterprise and Edu users the following week.

CEO Sam Altman called it "a giant, expensive model," saying

the company ran out of GPU capacity to roll out to user tiers at

the same time.

"We will add tens of thousands of GPUs next week ... this

isn't how we want to operate, but it's hard to perfectly predict

growth surges that lead to GPU shortages," he said in a post on

X.

OpenAI said the model also has a lower rate of

"hallucinations", a common issue in which large language models

generate false information. At 37.1%, GPT-4.5's hallucination

rate compares with the 61.8% shown by GPT-4o and 44% shown by

its o1 reasoning model.

GPT-4.5 supports file and image uploads and can also work on

writing and coding projects, but does not currently support

other advanced features such as voice and video.