Agent RFT enables reasoning models to become even more powerful, tool-using agents by training directly on the workflows they will execute in production. By operating on agent rollouts, reasoning models can call tools, generate intermediate reasoning steps, and receive real-time feedback via customer-provided endpoints. This Build Hour will walk through the preparation, infrastructure, and safety…
Introducing AgentKit—build, deploy, and optimize agentic workflows with a complete set of tools. This Build Hour demos how to design workflows visually and embed agentic UIs faster to create multi-step tool-calling agents. Samarth Madduru (Solutions Engineering), Tasia Potasinski (Product Marketing), and Henry Scott-Green (Product, Platform) cover: • Build with Agent Builder- a visual canvas based…
The Responses API is our flagship API for building agents. This Build Hour shows how the Responses API unlocks persistent reasoning, hosted tools, and multimodal workflows for GPT-5. Steve Coffey (API Engineering) covers: • How to use built-in tools, call multiple tools in one API request, and preserve reasoning tokens across turns • How the…
Codex is now one agent for everywhere you code — connected by your ChatGPT account. This Build Hour is a hands-on walkthrough of how to use all its features, including the new IDE extension and code review. Dominik Kundel (Developer Experience) and Pranav Deshpande (Product Marketing) cover: – What’s new with Codex? IDE extension, revamped…
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,…
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