Agents API (public beta)
The Agents API runs cloud agents on the Codex harness with durable sessions, sandboxes and compaction handled by OpenAI.
One API call starts an agent in an OpenAI-hosted sandbox or one you provide; OpenAI manages orchestration, context compaction and recovery. Computer use was added 2026-09-29. Follows the 2026-04-15 Agents SDK update with sandboxed execution and an open-source harness.
- Date
- Thursday, 10 September 2026
- Lab
- OpenAI
- Kind
- product
- Access
- closed API
Assistants API shut down 2026-08-26 and Agent Builder wind-down is set for 2026-11-30, leaving Responses plus Agents as the platform.
Sources
This record was checked against its sources on 6 October 2026. How we check