Overview

• GPT-5’s intelligent router automatically allocates tasks to specialized variants, removing manual model switching and optimizing performance and resource use.
• The model delivers improvements in coding, writing, math and visual reasoning while significantly reducing hallucinations and deceptive outputs.
• Developers can access full GPT-5, GPT-5 Mini and GPT-5 Nano through the API, with free and lower-tier users seamlessly falling back to smaller variants upon hitting usage limits.
• The new ChatGPT Agent autonomously executes complex, multi-step business workflows in minutes under human oversight via chain-of-thought views and intervention controls.
• Microsoft has embedded GPT-5 across Microsoft 365 Copilot, GitHub Copilot and Azure AI Foundry as OpenAI begins retiring legacy GPT models over the next 60 days.