Is Cerebras Inference down? › Outage history › Nov 18, 2025

Cerebras Inference outage on Nov 18, 2025: what happened

On Nov 18, 2025, the Cerebras Inference status page reported "Identified - Caused by External Depencency". About 3 hours 6 min: from Nov 18, 2025, 12:30 UTC to Nov 18, 2025, 15:36 UTC, by the official start and resolution times.

Cerebras Inference right now

At our last refresh (Oct 22, 2026, 12:35 UTC) Cerebras Inference was up: All Systems Operational.

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Started
Nov 18, 2025, 12:30 UTC
Resolved
Nov 18, 2025, 15:36 UTC
Duration
3 hours 6 min
Official impact
Critical
Affected
GPT-OSS-120B, Developer Console, Llama-3.3-70B, Llama3.1-8B, Qwen-3-32B, Qwen-3-235B-Instruct-2507, ZAI-GLM-4.6
Source
Identified - Caused by External Depencency on the Cerebras Inference status page

The Cerebras Inference status page rated it "Critical", its highest impact level: an outage of the affected parts, not only slowness.

What caused the Cerebras Inference outage?

"This issue is caused by a third-party system, and we are currently monitoring."

From the Cerebras Inference status page, Nov 18, 2025, 12:30 UTC.

When was it fixed?

The Cerebras Inference status page marked it resolved at Nov 18, 2025, 15:36 UTC, 3 hours 6 min after it started. A fix was in place and being monitored from Nov 18, 2025, 14:55 UTC.

Timeline of official updates

Every update the Cerebras Inference status page posted, oldest first. Times are UTC.

  1. Nov 18, 2025, 12:30 UTC investigating

    Around 4:09 AM PT, Inference Platform went down causing 500 Internal Server Errors. This issue is caused by a third-party system, and we are currently monitoring.

  2. Nov 18, 2025, 12:54 UTC investigating

    We are continuing to investigate this issue.

  3. Nov 18, 2025, 14:24 UTC investigating

    We are continuing to investigate this issue.

  4. Nov 18, 2025, 14:41 UTC identified

    The issue has been identified and a fix is being implemented.

  5. Nov 18, 2025, 14:55 UTC monitoring

    A fix has been implemented and we are monitoring the results.

  6. Nov 18, 2025, 14:57 UTC monitoring

    The platform is accessible now. We are monitoring to ensure stability.

  7. Nov 18, 2025, 15:36 UTC resolved

    This incident has been resolved.

Cerebras Inference outage questions

What caused the Cerebras Inference outage on Nov 18, 2025?

The Cerebras Inference status page said (update at Nov 18, 2025, 12:30 UTC): "This issue is caused by a third-party system, and we are currently monitoring."

When was the Cerebras Inference outage on Nov 18, 2025 fixed?

The Cerebras Inference status page marked it resolved at Nov 18, 2025, 15:36 UTC, 3 hours 6 min after it started. A fix was in place and being monitored from Nov 18, 2025, 14:55 UTC.

How long did the Cerebras Inference outage last?

About 3 hours 6 min: from Nov 18, 2025, 12:30 UTC to Nov 18, 2025, 15:36 UTC, by the official start and resolution times.

Was Cerebras Inference completely down?

The Cerebras Inference status page rated it "Critical", its highest impact level: an outage of the affected parts, not only slowness. The affected parts listed were: GPT-OSS-120B, Developer Console, Llama-3.3-70B, Llama3.1-8B, Qwen-3-32B, Qwen-3-235B-Instruct-2507, ZAI-GLM-4.6.

Which parts of Cerebras Inference were affected?

The Cerebras Inference status page listed: GPT-OSS-120B, Developer Console, Llama-3.3-70B, Llama3.1-8B, Qwen-3-32B, Qwen-3-235B-Instruct-2507, ZAI-GLM-4.6.

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Quotes are the Cerebras Inference status page's own words, from the official incident. Is It Up or Down is independent and not affiliated with Cerebras Inference. Times are UTC.