OpenAI opens the infrastructure behind Codex as an Agents API

OpenAI has released its Agents API as a public beta. The interface lets developers build cloud agents that run for hours, execute code and process files. The company says it runs on the same infrastructure that powers Codex and ChatGPT. Context is managed automatically, tools can be called in parallel, and work can be delegated to sub-agents. For the execution environment, developers can pick OpenAI's own sandbox or environments offered by Cloudflare, Vercel and Oracle. There are no extra fees; billing is based solely on token usage. The API builds on the open-source Codex harness and supports MCP, custom functions and built-in tools such as web search.