OpenAI's newly released o1-Pro model, now available via the Responses API, is designed for advanced reasoning tasks, allocating more computational resources for problem-solving, and is priced at $150 per million input tokens and $600 per million output tokens, making it the most expensive model compared to its predecessors like GPT-4.5. The model excels in complex code refactoring, scientific research, synthetic data generation, and legal or financial document analysis, offering enhanced capabilities for tasks requiring high accuracy and deep reasoning. However, its steep pricing, slower processing speed, and inability to handle basic vision tasks efficiently limit its use to high-value applications, prompting most developers to use it selectively. While o1-Pro represents a significant step in reasoning capabilities, models like o3-mini and GPT-4o remain more cost-effective for general purposes, indicating OpenAI's move towards specialized models tailored for specific tasks rather than a universal solution.