LangGraph vs OpenAI Responses API
A side-by-side comparison to help you choose the right tool.
| Feature | LangGraph | OpenAI Responses API |
|---|---|---|
| Our score | 87 | 87 |
| Pricing | Open-source project with no core license fee. | Usage-based API pricing; costs depend on the models and tools you use. |
| Free plan | Yes | No |
| Best for | Teams building serious agent workflows, Developers who need state and branching control, Builders who outgrew simple chains | Product teams building assistants or agents on OpenAI, Developers migrating from older endpoint patterns, Apps that need streaming and tool invocation in one API |
| Platforms | mac, windows, linux, api | api |
| API | Yes | Yes |
| Languages | en | en |
| Pros |
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| Visit site | Visit site |
- Pricing
- Open-source project with no core license fee.
- Free plan
- Yes
- Best for
- Teams building serious agent workflows, Developers who need state and branching control, Builders who outgrew simple chains
- Platforms
- mac, windows, linux, api
- API
- Yes
- Languages
- en
- Pricing
- Usage-based API pricing; costs depend on the models and tools you use.
- Free plan
- No
- Best for
- Product teams building assistants or agents on OpenAI, Developers migrating from older endpoint patterns, Apps that need streaming and tool invocation in one API
- Platforms
- api
- API
- Yes
- Languages
- en
87Choose LangGraph if:
- You are Teams building serious agent workflows
- You are Developers who need state and branching control
- You are Builders who outgrew simple chains
- You want to start free
87Choose OpenAI Responses API if:
- You are Product teams building assistants or agents on OpenAI
- You are Developers migrating from older endpoint patterns
- You are Apps that need streaming and tool invocation in one API
FAQ
- What is the difference between LangGraph and OpenAI Responses API?
- LangGraph is a graph-based framework for building stateful, multi-step agent workflows with more explicit control than plain prompt chaining. OpenAI Responses API is openai's newer response-oriented api surface for building assistants and agents with streaming, tools, and model control.
- Which is cheaper, LangGraph or OpenAI Responses API?
- LangGraph: Open-source project with no core license fee.. OpenAI Responses API: Usage-based API pricing; costs depend on the models and tools you use.. LangGraph has a free plan.
- Who is LangGraph best for?
- LangGraph is best for Teams building serious agent workflows, Developers who need state and branching control, Builders who outgrew simple chains.
- Who is OpenAI Responses API best for?
- OpenAI Responses API is best for Product teams building assistants or agents on OpenAI, Developers migrating from older endpoint patterns, Apps that need streaming and tool invocation in one API.