Is LangSmith down? › Outage history › Sep 2, 2026
LangSmith partial outage on Sep 2, 2026: what happened
On Sep 2, 2026, the LangSmith Global status page reported "Agent-scoped sandbox fails to initialize on new agents". About 3 hours 43 min: from Sep 2, 2026, 17:04 UTC to Sep 2, 2026, 20:47 UTC, by the official start and resolution times.
LangSmith right now
At our last refresh (Oct 22, 2026, 12:35 UTC) LangSmith was having problems: Partial System Degradation.
- Started
- Sep 2, 2026, 17:04 UTC
- Resolved
- Sep 2, 2026, 20:47 UTC
- Duration
- 3 hours 43 min
- Official impact
- Major
- Source
- Agent-scoped sandbox fails to initialize on new agents on the LangSmith Global status page
The LangSmith Global status page rated the impact "Major": a partial outage. Some parts or some users were affected; it was not a complete outage.
What caused the LangSmith partial outage?
The LangSmith Global status page has not published a cause. When it identified the problem at 17:59 UTC on Sep 2, 2026, it said: "We have identified the root cause of this incident and are actively working on a fix. The issue originates from a recent change to how sandbox slugs are generated in our backend systems, which now derive slugs directly rather than referencing sandbox IDs. This has introduced a mismatch between the values returned by the backend and those the frontend expects. We will share a further update as remediation progresses."
When was it fixed?
The LangSmith Global status page marked it resolved at Sep 2, 2026, 20:47 UTC, 3 hours 43 min after it started. A fix was in place and being monitored from Sep 2, 2026, 20:32 UTC. Its resolution note: "All systems are operational"
Timeline of official updates
Every update the LangSmith Global status page posted, oldest first. Times are UTC.
Sep 2, 2026, 17:04 UTC investigating
This affects only newly created agents with a shared computer.
Sep 2, 2026, 17:59 UTC identified
We have identified the root cause of this incident and are actively working on a fix. The issue originates from a recent change to how sandbox slugs are generated in our backend systems, which now derive slugs directly rather than referencing sandbox IDs. This has introduced a mismatch between the values returned by the backend and those the frontend expects. We will share a further update as remediation progresses.
Sep 2, 2026, 20:32 UTC monitoring
The fix has been deployed. All systems are operational
Sep 2, 2026, 20:47 UTC resolved
All systems are operational
LangSmith partial outage questions
What caused the LangSmith partial outage on Sep 2, 2026?
The LangSmith Global status page has not published a cause. When it identified the problem (Sep 2, 2026, 17:59 UTC) it said: "We have identified the root cause of this incident and are actively working on a fix. The issue originates from a recent change to how sandbox slugs are generated in our backend systems, which now derive slugs directly rather than referencing sandbox IDs. This has introduced a mismatch between the ..."
When was the LangSmith partial outage on Sep 2, 2026 fixed?
The LangSmith Global status page marked it resolved at Sep 2, 2026, 20:47 UTC, 3 hours 43 min after it started. A fix was in place and being monitored from Sep 2, 2026, 20:32 UTC. Its resolution note: "All systems are operational"
How long did the LangSmith partial outage last?
About 3 hours 43 min: from Sep 2, 2026, 17:04 UTC to Sep 2, 2026, 20:47 UTC, by the official start and resolution times.
Was LangSmith completely down?
No. The LangSmith Global status page rated the impact "Major": a partial outage. Some parts or some users were affected; it was not a complete outage.
Other recent LangSmith incidents
- Sandbox Performance Degraded Oct 14, 2026, 19:47 UTC, ongoing, 7 days 17 hours so far
- APAC Region Querying is down Oct 12, 2026, 06:46 UTC, duration not stated
- Seeing some issues logging into the application Oct 12, 2026, 05:42 UTC, 2 days 10 hours
- LLM Gateway service interruption Oct 8, 2026, 10:05 UTC, duration not stated
- Increased latency in Run Query V1 APIs Oct 8, 2026, 00:48 UTC, 1 hour 42 min
- LangSmith Deployment Database Provisioning Error Oct 3, 2026, 05:10 UTC, 5 hours 3 min
Full LangSmith outage history and biggest outages → · Recent outages across all services →
Quotes are the LangSmith Global status page's own words, from the official incident. Is It Up or Down is independent and not affiliated with LangSmith. Times are UTC.