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Attribute	LangGraph	OpenAI Agents SDK	smolagents
What it is	LangGraph is a low-level Python/JS framework for building agents as explicit graphs of steps. It is built for long-running, stateful agents where you need to pause for a human and resume later.	OpenAI's open-source Python SDK for multi-agent apps. Its core ideas are agents, handoffs between them, and guardrails on inputs and outputs, which map neatly onto triage-then-specialist support flows.	smolagents is Hugging Face's minimal agent library (about 1,000 lines). Its CodeAgent writes actions as Python code; Hugging Face built Open Deep Research on it.
Category	Framework	Framework	Framework
Type	Library	Library	Library
Best ranks	#1 Framework, Build a customer-support agent (7.6) #1 Framework, Build a deep-research agent (7.5)	#2 Framework, Build a customer-support agent (7.2) #2 Framework, Build a deep-research agent (6.9)	#3 Framework, Build a deep-research agent (6.7)
Pricing	FreeThe library is free to use; LangSmith is a separate paid product.As of Oct 28, 2026	Pricing not yet reviewed	Pricing not yet reviewed
License	Open source (MIT)Checked Oct 16, 2026	Open source (MIT)Checked Oct 16, 2026	Open source (Apache-2.0)Checked Oct 17, 2026
Layers	Framework	Framework	Framework
Last verified	2026-10-16	2026-10-16	2026-10-17