OpenAI released Symphony on March 5, 2026 — an open-source framework for orchestrating autonomous agents through structured implementation runs with explicit state machines, execution traces, and reproducible run logs for production workloads. Complements the OpenAI Agents SDK by providing higher-level orchestration primitives that LangGraph and CrewAI currently own. Positions OpenAI to own the full agent execution stack from model API to orchestration layer, reducing framework lock-in to third-party orchestrators.