OpenAI has introduced two new AI models, o3 and o4-mini, which represent a major advancement in AI reasoning and tool use, enabling autonomous reasoning and practical tool utilization. These models have expanded capabilities, such as using all tools within ChatGPT, integrating images into their reasoning processes, and performing complex problem-solving tasks. They outperform previous models in various benchmarks, showing significant improvements in accuracy and efficiency, especially in handling high school and college-level mathematics and real-world coding tasks. o3 and o4-mini can be accessed via ChatGPT or API, with o4-mini being notably more cost-effective for high-volume applications. OpenAI also released Codex CLI, an open-source coding agent that operates from the terminal, facilitating natural language execution of computer tasks. This strategic move indicates OpenAI's intention to strengthen its position among developers by offering cost-efficient, powerful tools and flexible AI solutions.