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- Jan 31, 202595% CONFIDENCEfrom help.openai.com
OpenAI o3-mini Released
- OpenAI released o3-mini on January 31, 2025, in ChatGPT and the API; OpenAI's release notes record 56% expert preference over o1-mini[1][2]
- For the first time a version is free to ChatGPT users, with rate limits; paid users can pick o3-mini-high, and it supports search with linked web sources[2]
- API access is through Chat Completions, Assistants and Batch APIs[2]
- The same-day news brief also covers free o1 ("Think Deeper") in Microsoft Copilot, a National Laboratories partnership, and reported SoftBank and Stargate investment plans, which are separate from the o3-mini launch[2]
Notable features
- OpenAI's first small reasoning model to support function calling, Structured Outputs and developer messages, with streaming and a choice of low, medium or high reasoning effort; it does not support vision[3]
- With medium reasoning effort it matches o1 on math, coding and science evaluations including AIME and GPQA; with high effort and a Python tool it solves over 32% of FrontierMath problems on the first attempt[3]
- Responses are 24 percent faster than o1-mini with better accuracy, strong in math, coding and science, and it shows its reasoning[2]
- In A/B testing responses averaged 7.7 seconds against 10.16 seconds for o1-mini, with time to first token 2,500 ms faster, and expert testers saw 39% fewer major errors on difficult real-world questions[3]
- It was trained with deliberative alignment, reasoning about human-written safety specifications before answering[3]
References 392% CONFIDENCE
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]95%OpenAI Model Release Notes: Introducing OpenAI o3-mini (January 31, 2025)help.openai.com· Posted Sep 19, 2026· Starts Jan 31, 2025· 83% of score
OpenAI's own model release notes date this entry January 31, 2025
- [2]70%The OpenAI Daily Brief: o3-Mini Model, U.S. Energy Collaboration, and SoftBank's Stargate Investmentpodcasts.apple.com· Published Jan 31, 2025· 8% of score
The OpenAI[1] Daily Brief's episode "o3-Mini Model, U.S. Energy Collaboration, and SoftBank's Stargate Investment" (2025-01-31) says: "AI reasoning faster and more accessible than ever!? Welcome to The OpenAI Weekly Brief, your go-to for the latest AI updates. Today is Friday, January 31st , 2025. Here’s what you need to know about OpenAI's groundbreaking launch of the o3-mini reasoning model. Let’s dive in. OpenAI has just unveiled its"
- [3]88%OpenAI o3-mini | OpenAI (Wayback Machine copy)web.archive.org· Published Jan 31, 2025· 8% of score
Archived copy of OpenAI's[1] o3-mini announcement, which says it is "our first small reasoning model that supports ... function calling, Structured Outputs, and developer messages", offers low, medium and high reasoning effort, and averaged "7.7 seconds compared to 10.16 seconds" for o1-mini.
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