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OpenAI Launches Agents API in Public Beta, Replacing the Assistants API

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OpenAI unveiled its Agents API at DevDay 2026, now available in public beta, which manages the core agent loop — including sessions, orchestration, context compaction, and error recovery — so developers no longer need to build it themselves. The API is built on the same managed infrastructure that powers Dots, OpenAI's own always-on agents announced at the event. It replaces the Assistants API, which was shut down in August, and becomes the primary stateful development path on OpenAI's platform. Developers can supply custom tools, choose from three execution environments, and build multi-turn agents using the Python SDK version 3.13.0 or later. During the beta period, there are no additional API fees beyond standard model and container usage rates, though data residency is currently limited to the US and Zero Data Retention is not supported.

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