GPT-4o MinivsGPT-o3

GPT-4o Mini is OpenAI's most affordable model in the GPT-4o family, designed to make advanced AI accessible for high-volume applications. At just $0.15 per million input tokens, it's one of the cheapest frontier-class models available while still delivering strong performance on everyday tasks. The model supports a 128K context window, function calling, JSON mode, and vision capabilities — inheriting key features from its larger sibling. GPT-4o Mini excels at classification, summarization, content generation, and simple reasoning tasks where full GPT-4o performance isn't necessary. It has become one of the most widely used AI models globally, powering millions of applications from chatbots to coding assistants to data processing pipelines.

GPT-o3 is OpenAI's most advanced reasoning model, succeeding o1 as the frontier of deliberative AI. It uses an enhanced chain-of-thought approach where the model spends more compute time 'thinking' before responding, dramatically improving performance on complex STEM, mathematical, and logical reasoning tasks. With a 200K token context window and the ability to use tools during reasoning, o3 represents a significant leap in AI problem-solving capabilities. It achieved state-of-the-art results on the ARC-AGI benchmark, demonstrating near-human performance on novel reasoning challenges. The model is particularly strong at multi-step mathematical proofs, complex code debugging, and scientific analysis where careful step-by-step reasoning is essential. Originally priced at a premium, an 80% price reduction in June 2025 made o3 accessible to a much broader range of developers and applications.