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Build agent-powered workflows for real engineering work with Codex and OpenAI APIs. In this Build Hour, you’ll learn how teams are moving beyond pair programming to agentic delegation, where AI systems can take on entire engineering tasks from planning to execution.
Charlie Guo (DevEx), Ryan Lopopolo (Future of Work), Mitch Troyanovsky (Cofounder, Basis) cover how to:
• Ship new features faster using Codex, with real examples from Basis: https://www.getbasis.ai/
• Build agent-driven systems using new API capabilities like hosted shell, skills, and websockets
• Evaluate and improve agents using the Agent Legibility Score framework
• Apply Harness Engineering techniques to make agent workflows reliable in production
• Use GPT-5.4 for large-context reasoning, computer-use tasks, and tool-based agent workflows
• Reduce manual overhead by turning complex logic into reusable agent-driven flows
👉 Codex docs: https://developers.openai.com/codex
👉 API docs: https://developers.openai.com/api/docs
👉 Harness Engineering Blog: https://openai.com/index/harness-engineering/
👉 GPT-5.4 Blog: https://openai.com/index/introducing-gpt-5-4/
👉 Follow along with the code repo: http://github.com/openai/build-hours
👉 Sign up for upcoming live Build Hours: https://webinar.openai.com/buildhours
00:00 Introduction
01:58 What’s New: Codex
05:01 What’s New: API
08:33 Demo: Agent Legibility Score
21:53 Harness Engineering
32:32 Customer Spotlight: Basis
47:57 Q&A Read More OpenAI
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