GPT-4o MinivsGPT-4.5

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-4.5 is OpenAI's largest and most knowledge-rich model, designed to excel at creative, nuanced, and emotionally intelligent tasks. Unlike the reasoning-focused o-series models, GPT-4.5 was trained with a massive amount of data to develop deep world knowledge and conversational sophistication. It produces more natural, human-like responses and demonstrates improved understanding of context, tone, and subtext. The model is particularly strong at creative writing, brainstorming, open-ended exploration, and tasks requiring emotional intelligence. However, its premium pricing ($75/1M input tokens) makes it the most expensive OpenAI model, positioning it for use cases where the highest quality creative output justifies the cost. It represents OpenAI's investment in making AI more relatable and conversationally capable.