# OpenAI Open-Sources Codex Harness, the Underlying Execution Framework for AI Agents

- Category: Flash (快讯)
- Published: 2026-08-21T11:58:00.000Z
- Source date: 2026-08-21
- HTML: https://www.88z.ai/en/news/flash-20260821-51154fed86065eff
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OpenAI has officially open-sourced Codex Harness, its underlying execution framework for AI agents. The framework covers the complete execution loop, including task understanding, memory retention, tool invocation, and human approval. It supports integration into business systems via CLI, SDK, and app-server. Key features include sandboxed secure execution, native Human-in-the-Loop mechanisms, streaming event transmission, and a model-agnostic architecture, aiming to provide developers with a fl

## At a glance

- OpenAI open-sources Codex Harness, covering the full execution loop from task understanding to human approval.
- Supports sandboxed secure execution and model-agnostic architecture, embeddable into business systems via CLI, SDK, and other methods.

## The update

OpenAI recently announced the open-sourcing of Codex Harness, an underlying execution framework designed specifically for AI agents. This framework handles the complete execution loop, ranging from task understanding and memory retention to tool invocation and human approval, ensuring that agents can efficiently and accurately complete complex workflows. Regarding integration, Codex Harness offers multiple access methods, supporting embedding into various business systems via command-line interfaces, software development kits, and application servers. Its core advantages lie in its built-in sandboxed secure execution environment, native Human-in-the-Loop interaction mechanism, streaming event transmission capabilities, and model-agnostic architecture design, providing developers with a solid foundation for building secure and flexible agent applications.

## Sources

- [Harness](https://www.88z.ai/flash/cite/flash-20260821-51154fed86065eff) (2026-08-21)

This article is an AI-assisted synthesis by 88Z AI based on the public sources below. Product claims and availability are attributed to their publishers. It does not represent independent testing or first-hand reporting.