Symphony is OpenAI's official open-source framework for turning project management into autonomous coding runs. Released in March 2026 under the Apache 2.0 license, it operates as a daemon service that polls issue trackers like Linear for work items, spawns isolated coding agents per issue, and manages the full development lifecycle from task assignment through implementation, human review, merging, and completion. The system generates proof-of-work artifacts before landing any code, ensuring that autonomous changes are verifiable and reviewable. Symphony is designed for teams that want to delegate implementation work to AI agents while retaining management oversight.
Built on Elixir and the Erlang OTP platform, Symphony leverages fault-tolerant supervision trees and lightweight BEAM processes to manage hundreds of concurrent coding agents simultaneously. Each agent runs in complete isolation with its own working directory, git branch, and context window, preventing interference between parallel tasks. The OTP architecture provides automatic crash recovery — if an agent encounters an unrecoverable error, the supervisor restarts it without affecting other running agents. Hot code reloading allows developers to update orchestration logic without stopping active agent sessions, a critical feature for continuous operation in production environments.
Symphony represents OpenAI's vision for the next stage of AI-assisted development: shifting from interactive pair programming to fully autonomous task execution with human review gates. The project has attracted 25K+ GitHub stars and active community discussion around integration patterns. The repository includes a detailed SPEC.md that serves as a reference implementation guide, with OpenAI explicitly encouraging teams to build their own hardened versions adapted to their specific infrastructure. Current limitations include Linear as the only supported issue tracker and prototype-level reliability, but the architecture is designed for extensibility to other project management tools and CI systems.
