In 2025, agents don’t just think — they run code, call tools, and complete tasks.
This Build Hour is a hands-on walkthrough of how to design agentic systems that reason and act using OpenAI’s latest APIs and SDKs.
Ilan Bigio (Developer Experience) covers:
– What’s new in 2025: Responses API, Agents SDK, Hosted Tools, Codex, and more
– Chain of thought concepts: reasoning, tool calling, and long-horizon tasks
– Live demo: building an agentic task system to process a backlog of tickets
– Delegation: directional guidance for evals
– Live Q&A
Follow along with the code repo: https://github.com/openai/build-hours
Check out additional resources: https://developers.openai.com/
Sign up for upcoming live Build Hours: https://webinar.openai.com/buildhours