OpenAI Agents API in public beta: the Codex harness for cloud agents
According to a 21 September overview, the OpenAI Agents API is available in public beta. The API exposes the managed Codex harness with sandboxed execution, MCP, artifacts and multi-agent delegation.
Who is affected and how
- senior developer
- Can build a Codex-based cloud agent into their own product.
- startup founder
- A managed agent runtime, with no infrastructure of your own.
Sources
- OpenAI Agents API Public Beta: A Developer's Guide to Cloud Agents on the Codex Harness | Stackademicstackademic.com · Sep 21, 2026
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