Model releaseModerate global significanceConfirmed confidence
OpenAI releases o3-mini
OpenAI publicly released o3-mini on January 31, 2025, through ChatGPT and the API.
What happened
Event details
o3-mini was a small reasoning model in OpenAI’s o-series. At launch it supported Structured Outputs, function calling, the Batch API, and configurable reasoning effort.
Assessment
Why it matters
o3-mini expanded lower-cost, lower-latency reasoning for STEM applications across ChatGPT and the API, although it was an extension of the existing o-series and has since been deprecated.
68/100Global significance score. Regional effects are recorded only when the evidence supports a meaningful difference.
Availability
Access notes
The model was publicly available at launch. As of this review, OpenAI’s API documentation lists it as deprecated.