Capability · Comparison
OpenAI Agents SDK vs Swarm
OpenAI Agents SDK and Swarm are often confused because they share a hand-off model, but they play very different roles. Swarm was a 2024 experimental library OpenAI released to demonstrate agent routing; it was never production-grade. The Agents SDK is the 2025 successor — first-class, supported, with tracing, guardrails, and the Responses API built in. If you're shipping in 2026, you almost always want the Agents SDK.
Side-by-side
| Criterion | OpenAI Agents SDK | OpenAI Swarm |
|---|---|---|
| Support level | Officially supported, production | Experimental, not maintained for production |
| Tracing / observability | Built-in, exportable traces | None out of the box |
| Guardrails | First-class input/output guardrails | Not included |
| Hand-off pattern | Yes — agent-to-agent hand-off | Yes — the original demo of this pattern |
| Model compatibility | Any OpenAI model + Responses API | Chat Completions only |
| State / session management | Built-in session primitives | Stateless by design |
| Language support | Python + TypeScript | Python only |
| Maturity (as of 2026-04) | GA, v1+ stability guarantees | Archived reference code |
Verdict
There is no serious case for starting a new project on Swarm in 2026. The Agents SDK is the official production path with tracing, guardrails, session state, and TypeScript support — everything Swarm deliberately did not include. Swarm remains a good 30-minute read to understand where the hand-off pattern came from, but any real deployment belongs on Agents SDK or a third-party framework that offers more opinionated orchestration.
When to choose each
Choose OpenAI Agents SDK if…
- You're building any production agent backed by OpenAI models.
- You need tracing, guardrails, or session state.
- You want TypeScript agents.
- You want Responses API features (tool use, streaming, structured output).
Choose OpenAI Swarm if…
- You're learning the hand-off pattern and want the simplest reference.
- You explicitly don't want a framework — just readable code to copy.
- Your workload is a throwaway demo.
- You're teaching a class and want a ~200-line example.
Frequently asked questions
Is Swarm being deprecated?
It was never officially maintained — OpenAI described it from day one as educational. The Agents SDK is the supported successor and is where new features land.
Can I migrate Swarm code to Agents SDK?
Yes — the hand-off mental model carries over. You'll add typed tools, trace handlers, and guardrails, and you'll move from Chat Completions to Responses.
Is Agents SDK the best framework for multi-agent systems?
If you're OpenAI-centric, yes. For heterogeneous or open-weight stacks, LangGraph or CrewAI give you more flexibility.
Sources
- OpenAI — Agents SDK — accessed 2026-04-20
- OpenAI — Swarm (archived) — accessed 2026-04-20