OpenAI's ChatGPT Agent Outperforms the Model Alone: Impact for Developers

A new ChatGPT agent was introduced in OpenAI’s July 17, 2025 announcement as a new agentic model in the same family as OpenAI o3, but with better benchmarks. Do the new features only affect ChatGPT product users, or do they also impact OpenAI platform customers and third-party developers?