Symphony
https://github.com/openai/symphony
The agents complete the tasks and provide proof of work: CI status, PR review feedback, complexity analysis, and walkthrough videos. When accepted, the agents land the PR safely. Engineers do not need to supervise Codex; they can manage the work at a higher level
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agent-generated artifact for human review -- video showing changes
Symphony works best in codebases that have adopted harness engineering. Symphony is the next step -- moving from managing coding agents to managing work that needs to get done.
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For harness engineering, it pointed to blog post - OpenAI harness engineering 2026-02