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OpenAI Opens Its Agents API to All Developers

OpenAI launched its Agents API into public beta on September 11. This API gives developers access to the same infrastructure that runs Codex internally. It manages context, calls t...

Analysis by Mouad Belghiti·1 min read·Editorial Standards

OpenAI launched its Agents API into public beta on September 11. This API gives developers access to the same infrastructure that runs Codex internally. It manages context, calls tools, coordinates subagents, and keeps agents running reliably for multi-day tasks.

The API also provides sandboxed environments where agents can work with files, run code, and save intermediate results. Previously this kind of persistent agent infrastructure required building your own harness. OpenAI is now offering it as a managed service.

Companies are watching the economics carefully. A separate report in The Pragmatic Engineer shows a trend of teams routing simpler requests to cheaper open models while reserving the Agents API for high-value tasks. Per-developer usage limits are appearing at more companies as agent costs start showing up meaningfully in cloud bills.

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OpenAI Opens Its Agents API to All Developers | Belghitis