# OpenAI explains building with the Codex harness through the Agents API

> Original title: Harness-as-a-Service: Building with the Agents API | DevDay 2026

- Source: OpenAI · YouTube
- Published: 2026-11-11T01:24:07.000Z
- Bad Influence: https://badinfluence.news/items/noyh0wby6o4oic9nm8oaatqde
- Original: https://www.youtube.com/watch?v=b7l_Dhe1h8M

## Summary

OpenAI presents a DevDay 2026 session on building with the Codex harness through the Agents API. The session covers running agents in a customer's environment, keeping long-running tasks going, and which infrastructure OpenAI manages.