---
title: "OpenAI launches Agents API, exposing its Codex agent harness"
url: https://www.parallelquant.com/posts/openai-launches-agents-api-exposing-its-codex-agent-harness-55d356
source_name: "MarkTechPost"
source_url: https://www.marktechpost.com/2026/09/10/openai-launches-the-agents-api-in-public-beta-putting-the-codex-harness-behind-one-api-call/
published: 2026-09-10T21:21:58.000Z
topics: ["agents", "products"]
publisher: "Parallel Quant"
---

# OpenAI launches Agents API, exposing its Codex agent harness

*2026-09-10 · Source: [MarkTechPost](https://www.marktechpost.com/2026/09/10/openai-launches-the-agents-api-in-public-beta-putting-the-codex-harness-behind-one-api-call/)*

OpenAI released a public beta of its Agents API, giving developers the same harness and infrastructure that runs Codex. Developers can run the agent's compute in an OpenAI-managed sandbox, their own infrastructure, or a partner sandbox.

**Why it matters:** This moves OpenAI from selling models to selling a full agent runtime, competing directly with frameworks and startups that provide agent orchestration and sandboxing. It's part of a broader shift where model providers are vertically integrating the 'harness' layer that turns raw model calls into working autonomous agents.

**Topics:** agents, products

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Read the original: https://www.marktechpost.com/2026/09/10/openai-launches-the-agents-api-in-public-beta-putting-the-codex-harness-behind-one-api-call/
Canonical: https://www.parallelquant.com/posts/openai-launches-agents-api-exposing-its-codex-agent-harness-55d356
Published by Parallel Quant — https://www.parallelquant.com