From the results of this evaluation, o3's hallucination rate is 33 percent, and o4-mini's hallucination rate is 48 percent — almost half of the time. By comparison, o1's hallucination rate is 16 ...

OpenAI's o3 and o4-mini models for ChatGPT have arrived.

He joined The Verge in 2019 after nearly two years at Techmeme. OpenAI is releasing two new AI reasoning models today: o3, which the company calls its “most powerful reasoning model,” and o4 ...

As a result, like older models, o3 and o4-mini show strong and even improved performance in coding, math, and science tasks. However, they also have an important new addition: visual understanding.

On Wednesday, OpenAI launched its latest reasoning models, o3 and o4-mini. As with its other o-series models, OpenAI’s o3 and o4-mini think for a longer period of time before responding in order ...

UPDATE: Apr. 16, 2025, 2:18 p.m. EDT Now that the OpenAI livestream has ended, this article has been updated with the latest information about the o3 and o4-mini launch. OpenAI's o3 and o4-mini ...