OpenAI announces o3 and o4-mini reasoning models for ChatGPT (updated)

OpenAI pivoted and decided to release its o-series models after all.

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 for ChatGPT have arrived.

As expected, during a livestream event today, the ChatGPT maker …

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