GPT-5 is a multimodal large language model series developed by OpenAI, officially released on August 7, 2025. The GPT-5 (minimal) variant, commonly known as GPT-5 mini, is an efficient, low-latency version of the foundation model designed for high-speed tasks and cost-effective deployment. It utilizes a unified architecture that integrates reasoning capabilities—previously associated with the o-series models—directly into the standard model flow, enabling it to handle complex logic and multi-step tasks autonomously.
The model offers significant improvements over the GPT-4 series in areas such as front-end software engineering, mathematical reasoning, and agentic tool-calling. It is designed to work across multiple modalities, allowing it to perceive and generate text, images, audio, and video. A key feature of this generation is the introduction of "reasoning effort" controls, which allow the model to scale its internal thought process based on the difficulty of the prompt.
Technically, GPT-5 supports a context window of up to 400,000 tokens through the OpenAI API, with varied limits for consumer-facing chat products. It is part of a broader family of models that includes GPT-5 Nano for on-device use and the reasoning-focused GPT-5 Thinking variant. The model exhibits a marked reduction in hallucination rates and improved factual accuracy compared to its predecessors.