openai/symphony

Symphony turns project work into isolated, autonomous implementation runs, allowing teams to manage work instead of supervising coding agents.

ElixirApache-2.0 Last commit 1 month ago openai.com/index/open-source-codex-orchestration-symphony

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Last 24 hours: +11; stars
Last 7 days: +106; stars
Last 30 days: +491; stars
Total stars: 27,718; 27.2k a month ago
Forks: 2,878; 9 contributors

Star history

Last 12 weeks · weekly cumulative stars · computed from public GitHub star events

Momentum: #367 in Coding agents this week · +106 stars this week

Rank in its topics

Position among repos ranked in each topic (min. 20 stars gained)

Rank of openai/symphony in each topic for today, this week and this month
Topic	Today	This week	This month
Coding agents	–	#367of 407	#433of 529

Health signals

Mixed signalsChecked Oct 15, 2026

Commit activity: Commits in 5 of the last 13 weeks 24 commits on the default branch in 90 days
Maintainers: 1 active maintainer Top author: 100% of the last 24 commits
Issue responsiveness: Too few issues to tell 0 issues opened by others in 90 days
Pull requests: 24 merged, 3 closed, 0 open Of 27 pull requests opened in 90 days
Releases: Last release: 4 weeks ago 4 releases in the last 12 months
Project hygiene: License, CI; no security policy
OpenSSF Scorecard: Not scanned Unknown, not counted against the project

Signals are computed automatically from public GitHub data. They are not an endorsement or a security audit. How health is computed

README

README.md

Symphony

Symphony turns project work into isolated, autonomous implementation runs, allowing teams to manage work instead of supervising coding agents.

In this demo video, Symphony monitors a Linear board for work and spawns agents to handle the tasks. 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.

Warning

Symphony is a low-key engineering preview for testing in trusted environments.

Running Symphony

Requirements

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.

Option 1. Make your own

Tell your favorite coding agent to build Symphony in a programming language of your choice:

Implement Symphony according to the following spec: https://github.com/openai/symphony/blob/main/SPEC.md

Option 2. Use our experimental reference implementation

Check out elixir/README.md for instructions on how to set up your environment and run the Elixir-based Symphony implementation. You can also ask your favorite coding agent to help with the setup: