OpenAI has released two new models, o3 and o4-mini, which integrate simulated reasoning with full access to various tools including web browsing and coding functionalities. These models are designed for different use cases, with o3 focusing on complex analysis and o4-mini optimizing for speed and cost efficiency, marking a significant advancement in ChatGPT’s capabilities. Access to these models is being rolled out to various user tiers, with enhanced features for developers through the Chat Completions API and Responses API.