An AI model can propose a plan. An agent needs somewhere to put its tools, files, context, mistakes, and the task it promised to finish three hours ago. OpenAI’s newest developer product is aimed squarely at that less glamorous machinery.
OpenAI launched the Agents API in public beta, offering the execution harness used by Codex as a programmable service. Developers can run tasks that last for days, use built-in tools, preserve context, create subagents, and choose hosted, self-managed, or partner sandboxes. OpenAI says the API carries no additional platform fee beyond the models and tools consumed.
A model gets a workshop
The distinction between a model API and an agent API is operational. A model request is usually bounded: send input, receive output. An agent may inspect a repository, run a command, discover a failure, retry, delegate a narrow subtask, and return later with an artifact. That requires durable state and a controlled place where actions can occur.
Packaging those pieces as a service could make sophisticated workflows much easier to build. It also concentrates responsibility. The agent may arrive with a workshop, but the developer still decides which doors it can open, what it is allowed to change, how much it can spend, and when a human must approve the next move.
The sandbox choices are therefore as important as the headline. A hosted environment reduces setup. A self-managed environment offers more control. Partner options may fit existing infrastructure. None automatically answers the uncomfortable question: what happens when a long-running process confidently pursues the wrong objective overnight?
The signal
Agent products are moving from impressive loops in a demo to infrastructure with scheduling, persistence, tools, and boundaries. That is progress, but it changes the evaluation target. Developers must test not only whether the model gives good answers, but whether the whole system stops, recovers, records its actions, and respects permissions.
The agent now has an office, a toolbox, and permission to stay late. The next feature request should be a very good lock on the supply closet.
