OpenAI Launches Agents API Public Beta Built on Codex Harness
Codeblix_Ltd · reddit · 2026-09-11
OpenAI launched the Agents API in public beta on September 10, letting developers create cloud agents in one API call. Key points:
- Built on the Codex harness; agents can run in OpenAI's sandbox, on developer infrastructure, or partner environments (Cloudflare, Modal, Vercel)
- Adds context compaction, tool search, parallel programmatic tool calls, and multi-agent support
- Free during beta, but token and tool usage still billed
- The orchestration/execution split lets teams reuse the harness without moving all files and secrets into OpenAI's sandbox
Related event: OpenAI Launches Agents API Beta, Opening Up the Codex Harness(21 posts)→
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