OpenAI released OpenAI o3 and o4-mini, the latest models in its o-series of reasoning models. o3 was positioned as the company's most powerful reasoning model, while o4-mini offered strong performance at lower cost and latency. They were the first reasoning models able to agentically use and combine every tool within ChatGPT, including web search, Python, image analysis, and image generation, and introduced the ability to "think with images" by integrating them into the reasoning process.