OpenAI's Agents API provides access to the Codex harness, with OpenAI managing sessions, orchestration, context compaction, and recovery while applications supply tools and execution environments. Agents can run code in sandboxes, edit files, connect to MCP servers, and produce artifacts. Usage is billed at standard model, tool, and container rates. Sessions are durable and can be resumed, steered mid-task, and delegated to subagents.
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