Our hypothesis is that o4-mini is a much better model, but we'll wait to hear feedback from developers. Evals only tell part of the story, and we wouldn't want to prematurely deprecate a model that developers continue to find value in. Model behavior is extremely high dimensional, and it's impossible to prevent regression on 100% use cases/prompts, especially if those prompts were originally tuned to the quirks of the older model. But if the majority of developers migrate happily, then it may make sense to deprecate at some future point.
We generally want to give developers as stable as an experience as possible, and not force them to swap models every few months whether they want to or not.
— Ted Sanders, OpenAI, on deprecating o3-mini
Recent articles
- Trying out the new Gemini 2.5 model family - 17th June 2025
- The lethal trifecta for AI agents: private data, untrusted content, and external communication - 16th June 2025
- An Introduction to Google’s Approach to AI Agent Security - 15th June 2025