LangChain operates LangSmith in customer AWS accounts in 15 regions

LangChain made LangSmith Bring Your Own Cloud open to all Enterprise customers on Amazon Web Services (AWS). LangSmith is a tool to test and operate AI agents. The customer gets a managed deployment in its own AWS account. It is open in 15 regions in the US, EU and Asia Pacific. LangChain gave no test results.

How it works

The control plane, the part that manages the tool, operates in the cloud of LangChain. It has no sensitive data. The data plane operates in the account of the customer and has traces, prompts and datasets. The two connect by a private path, not the public internet.

The proof

The source gives no numbers on speed or cost. One customer, Latent Health, says it keeps sensitive data in its own environment.

What is not known

LangChain does the upgrades and patches. The source does not give the price or the number of customers.

Insight: Data stays home but the vendor still operates it

LangChain manages the cluster of each customer from its own cloud. In October 2026, AWS made Strands Box, a sandbox for agents, and in November 2026 it added Kiro bots. This reads as a contest for the position in the AWS account of the customer. The agent tool that operates there can keep the customer. Find which tool is closest to your data.