How to Use GPT 5.5 for Agentic Coding

OpenAI's GPT 5.5 is one of the most capable models available for agentic coding - writing code, using tools, running commands, and iterating on complex tasks autonomously. In this guide, you'll learn how to set up GPT 5.5 in AgentOne and start using it for agentic coding workflows. What Is Agentic Coding? Agentic coding is when an AI model doesn't just suggest code, it actively writes, runs, debugs, and iterates on code using tools. Instead of copy-pasting snippets from a chatbot, you give the a