https://openai.com/index/introducing-gpt-5
GPT-5 (August 2025) is OpenAI’s new unified model, faster, smarter, and more reliable than its predecessors. It combines rapid responses with deep reasoning, with fewer hallucinations, a more concise style, and major improvements in writing, coding, and healthcare. It achieves record performance on numerous benchmarks, reduces over-compliance, and offers customizable personalities. A GPT-5 Pro version provides extended reasoning for complex tasks. Deployed by default in ChatGPT, it is available to all users, with more capabilities for paid subscribers.