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UPDATE: Apr. 16, 2025, 2:18 PM 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 models ...

On Wednesday, OpenAI announced the release of two new models—o3 and o4-mini—that combine simulated reasoning capabilities with access to functions like web browsing and coding. These models mark the ...

OpenAI is slowly inviting selected users to test a whole new set of reasoning models named o3 and o3 mini, successors to the o1 and o1-mini models that just entered full release earlier this month.

OpenAI has unveiled its latest AI models, o3 and o4-mini, representing a pivotal advancement in artificial intelligence. These models introduce enhanced reasoning, seamless tool integration, and ...

A mere two days after announcing GPT-4.1, OpenAI is releasing not one but two new models. The company today announced the public availability of o3 and o4-mini. Of the former, OpenAI says o3 is its ...

OpenAI’s recently launched o3 and o4-mini AI models are state-of-the-art in many respects. However, the new models still hallucinate, or make things up — in fact, they hallucinate more than several of ...

Simply put, reasoning models are trained to "think before they speak," meaning they take more time to process the prompt but provide higher-quality responses. As a result, like older models, o3 and o4 ...