LangChain provides an open agent engineering platform and frameworks to build and own intelligence. It incorporates learnings from open source projects into its commercial LangSmith platform.
At a glance
| Best for | engineering teams building agents |
From LangChain's own website.
Company facts
| Social profiles | LinkedIn, X, YouTube |
Facilities and features
Its website also mentions:
- Self-serve sign-up
What stands out
LangChain offers a framework agnostic platform for observing and deploying agents.
“LangSmith is the framework agnostic agent engineering platform for observing, evaluating, and deploying agents.”LangChain, own website
LangChain allows users to choose closed or open models for their workload.
“Use closed, open, or a combination of models to select the best model for your workload.”LangChain, own website
How it ranks
LangChain is ranked 7th of 10 in Best Open-Source AI Startups (Lister Score 89.6).
#7 in Best Open-Source AI Startups · Lister Score 89.6
LangChain, founded in 2022 in San Francisco, maintains the open-source LangChain, LangGraph and Deep Agents frameworks for building AI agents, and sells LangSmith for testing and monitoring them. It raised a $125 million Series B in October 2025.
LangChain raised a $125 million Series B in October 2025..
| Rank | Best Open-Source AI Startups | Score |
|---|---|---|
| 1 | Mistral AI | 97.3 |
| 2 | Moonshot AI | 96.0 |
| 3 | Together AI | 94.8 |
| 4 | Black Forest Labs | 93.5 |
| 5 | Reflection AI | 92.2 |
| 6 | Ollama | 90.9 |
| 7 | LangChain | 89.6 |
| 8 | Inferact | 88.3 |
| 9 | Nous Research | 87.0 |
| 10 | Stability AI | 85.7 |
Frequently asked questions
How does LangChain rank on Lister?
LangChain is ranked 7th of 10 in Best Open-Source AI Startups (Lister Score 89.6).
Appears in
- #9 in Best AI agent frameworks · AI
- #10 in Open-source AI integration platforms · AI
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