Build an agent by dragging nodes on OpenAI's platform, then ship it as an API. Built by OpenAI.
Others in vendor sdk
Claude Agent SDKClaude Code as a library you can run yourself.
Google ADKGoogle's agent toolkit, from the loop up, runnable with no API key.
Microsoft Agent Framework
OpenAI Agents SDKOpenAI's own agent loop, with handoffs and guardrails.Common questions
Is OpenAI Agent Builder free to use?
OpenAI Agent Builder is open source and free to run yourself. You still pay whichever model provider you point it at, and this tutorial is free with no signup.
Do I need to know Python to use OpenAI Agent Builder?
Basic Python is enough. Functions, dictionaries and imports cover most of what OpenAI Agent Builder asks of you.
When should I not use OpenAI Agent Builder?
When something else in vendor sdk fits the job better. The others in that group are listed below.
Lessons for OpenAI Agent Builder are being written. Meanwhile the APIs for AI tutorial covers the same ground: state, tools, loops, memory and human approval. Most of it carries straight over.
Start the APIs for AI tutorial →