The codex harness just became a managed api, and that changes who can build agents. openai's agents…
the codex harness just became a managed api, and that changes who can build agents. openai's agents api, in public beta since september 10, runs long-lived agent sessions with mcp, custom tools, subagents and automatic context compaction inside its own sandboxes, with no separate api fee.
the agent runtime is now a utility you rent.
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The note above is reproduced unedited from the original post, first published on Threads on 23 September 2026 at 23:34 IST.
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