May 13 (Reuters) - ChatGPT maker OpenAI said on Monday

it would release a new AI model called GPT-4o, which reasons

across voice, text and vision.

OpenAI's chief technology officer, Mira Murati, said during

a livestream event that the new GPT-4o model would be offered

for free because it is more efficient than the company's

previous models.

Paid users of GPT-4o will have greater capacity limits than

the company's paid users, she said.

OpenAI is under pressure to expand the user base of ChatGPT,

its popular chatbot product that wowed the world with its

ability to produce human-like written content and top-notch

software code.