GPT5

GPT-5 is OpenAI's unified, state-of-the-art multimodal system, featuring a real-time router for automatic complex reasoning and a 400K token context window.

This is the GPT-5 system: OpenAI launched it on August 7, 2025, as the successor to GPT-4o. It represents a major architectural shift, unifying advanced reasoning (from the O-series) and multimodal capabilities into a single, adaptive system. A real-time router intelligently selects between a high-throughput 'Fast Mode' and a deeper 'Thinking Mode' based on query complexity: manual model-switching is eliminated. Developers gain a 400K token context window via the API, enabling processing of entire codebases or large documents. The model delivers state-of-the-art performance across mathematics, coding, and finance, with a confirmed 94.6% accuracy on advanced math benchmarks and significantly reduced hallucinations.

https://openai.com/gpt-5