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Investigating - We are investigating an issue with Claude Opus 4.1 that started at 7:30 PT / 14:30 UTC.
Sep 04, 2025 - 14:51 UTC
Sep 04, 2025 - 14:51 UTC
Uptime over the past 90 days. View historical uptime.
claude.ai
Operational
90 days ago
99.13
% uptime
Today
console.anthropic.com
Operational
90 days ago
99.49
% uptime
Today
api.anthropic.com
Operational
90 days ago
99.42
% uptime
Today
Claude Code
Operational
90 days ago
99.45
% uptime
Today
Operational
Degraded Performance
Partial Outage
Major Outage
Maintenance
Major outage
Partial outage
No downtime recorded on this day.
No data exists for this day.
had a major outage.
had a partial outage.
Related
No incidents or maintenance related to this downtime.
Past Incidents
Sep 4, 2025
Resolved -
As of 7:30 PT / 14:30 UTC we have resolved this incident.
Sep 4, 14:59 UTC
Sep 4, 14:59 UTC
Investigating -
We are investigating an issue with Claude Haiku 3.5 that started at 6:00 PT / 13:00 UTC.
Sep 4, 13:57 UTC
Sep 4, 13:57 UTC
Resolved -
As of 23:50 PT / 6:50 UTC, we have mitigated the incident.
Sep 4, 07:00 UTC
Sep 4, 07:00 UTC
Investigating -
We are investigating an issue with Claude Sonnet 4.0 that started at 23:25 PT / 6:25 UTC.
Sep 4, 06:44 UTC
Sep 4, 06:44 UTC
Sep 3, 2025
Resolved -
As of 00:15 PT / 7:15 UTC, we have mitigated the incident.
Sep 3, 07:59 UTC
Sep 3, 07:59 UTC
Update -
We are continuing to monitor for any further issues.
Sep 3, 07:21 UTC
Sep 3, 07:21 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Sep 3, 07:19 UTC
Sep 3, 07:19 UTC
Investigating -
We are currently investigating this issue.
Sep 3, 06:39 UTC
Sep 3, 06:39 UTC
Resolved -
This incident has been resolved.
Sep 3, 01:45 UTC
Sep 3, 01:45 UTC
Identified -
The issue has been identified and a fix is being implemented.
Sep 3, 01:34 UTC
Sep 3, 01:34 UTC
Sep 2, 2025
No incidents reported.
Sep 1, 2025
Resolved -
This incident has been resolved.
Sep 1, 08:55 UTC
Sep 1, 08:55 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Sep 1, 08:19 UTC
Sep 1, 08:19 UTC
Investigating -
We are seeing an elevated amount of errors on Claude 3.5 Sonnet (Oct 2024) since 23:10 PT / 6:10 UTC.
Sep 1, 07:14 UTC
Sep 1, 07:14 UTC
Aug 31, 2025
Resolved -
This incident has been resolved.
Aug 31, 18:21 UTC
Aug 31, 18:21 UTC
Update -
Fix has been implemented and is being deployed
Aug 31, 17:55 UTC
Aug 31, 17:55 UTC
Investigating -
We are continuing to investigate this issue.
Aug 31, 17:09 UTC
Aug 31, 17:09 UTC
Resolved -
As of 00:50 PT / 7:30 UTC, we have mitigated the incident.
Aug 31, 08:01 UTC
Aug 31, 08:01 UTC
Investigating -
We are investigating an issue with Claude Sonnet 4.0 that started at 22:30 PT / 5:30 UTC.
Aug 31, 07:32 UTC
Aug 31, 07:32 UTC
Aug 30, 2025
Resolved -
As of 1:15 PT / 8:15 UTC this incident has been mitigated.
Aug 30, 09:22 UTC
Aug 30, 09:22 UTC
Update -
This incident erroneously had Sonnet 4.1 in the title. The model affected was Sonnet 4.0.
Aug 30, 09:20 UTC
Aug 30, 09:20 UTC
Investigating -
We are investigating an issue with Claude Sonnet 4.0 that started at 22:30 PT / 5:30 UTC.
Aug 30, 07:05 UTC
Aug 30, 07:05 UTC
Resolved -
This incident has been resolved.
Aug 30, 02:12 UTC
Aug 30, 02:12 UTC
Identified -
From 17:30 UTC on Aug 25th to 02:00 UTC on Aug 28th, Claude Opus 4.1 experienced a degradation in quality for some requests. Users may have seen lower intelligence, malformed responses or issues with tool calling in Claude Code.
This was caused by a rollout of our inference stack, which we have since rolled back for Claude Opus 4.1. While we often make changes intended to improve the efficiency and throughput of our models, our intention is always to retain the same model response quality.
We’ve also discovered that Claude Opus 4.0 has been affected by the same issue and we are in the process of rolling it back.
Aug 29, 17:02 UTC
This was caused by a rollout of our inference stack, which we have since rolled back for Claude Opus 4.1. While we often make changes intended to improve the efficiency and throughput of our models, our intention is always to retain the same model response quality.
We’ve also discovered that Claude Opus 4.0 has been affected by the same issue and we are in the process of rolling it back.
Aug 29, 17:02 UTC
Aug 29, 2025
Resolved -
As of 2:15 PT / 9:15 UTC this incident has been mitigated.
Aug 29, 09:27 UTC
Aug 29, 09:27 UTC
Investigating -
We are investigating an issue with Claude Sonnet 4.0 that started at 22:30 PT / 5:30 UTC.
Aug 29, 06:23 UTC
Aug 29, 06:23 UTC
Completed -
The scheduled maintenance has been completed.
Aug 29, 02:40 UTC
Aug 29, 02:40 UTC
Verifying -
Verification is currently underway for the maintenance items.
Aug 29, 02:14 UTC
Aug 29, 02:14 UTC
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Aug 29, 01:25 UTC
Aug 29, 01:25 UTC
Scheduled -
We are currently applying updates to systems used to store Connector Authentication.
Aug 29, 01:23 UTC
Aug 29, 01:23 UTC
Aug 28, 2025
Resolved -
This incident has been resolved.
Aug 28, 19:38 UTC
Aug 28, 19:38 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 28, 19:31 UTC
Aug 28, 19:31 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 28, 19:03 UTC
Aug 28, 19:03 UTC
Investigating -
We are currently investigating this issue.
Aug 28, 18:47 UTC
Aug 28, 18:47 UTC
Resolved -
This incident has been resolved.
Aug 28, 17:03 UTC
Aug 28, 17:03 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 28, 17:00 UTC
Aug 28, 17:00 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 28, 16:47 UTC
Aug 28, 16:47 UTC
Investigating -
We are currently investigating this issue.
Aug 28, 16:20 UTC
Aug 28, 16:20 UTC
Resolved -
As of 7:20 PT / 14:20 UTC we have mitigated the incident.
Aug 28, 15:03 UTC
Aug 28, 15:03 UTC
Investigating -
We have seen errors return to the baseline level since 5:05 PT / 13:05 UTC.
Aug 28, 12:29 UTC
Aug 28, 12:29 UTC
Resolved -
As of 0:50 PT / 7:50 UTC we have mitigated the incident.
Aug 28, 11:20 UTC
Aug 28, 11:20 UTC
Investigating -
We are investigating an issue with Claude Opus 4.1 that started at 23:10 PT / 6:10 UTC.
Aug 28, 06:30 UTC
Aug 28, 06:30 UTC
Aug 27, 2025
Resolved -
As of 6:40 PT / 13:40 UTC we have mitigated the incident.
Aug 27, 13:46 UTC
Aug 27, 13:46 UTC
Investigating -
We are investigating an issue, with Claude Opus 4.1 similar to the one that happened earlier, this time starting with 4:14 PT / 11:14 UTC.
Aug 27, 11:29 UTC
Aug 27, 11:29 UTC
Resolved -
As of 00:46 PT / 7:46 UTC the errors are back to baseline.
Aug 27, 08:11 UTC
Aug 27, 08:11 UTC
Investigating -
We are investigating an issue with Claude Opus 4.1 that started at 23:08 PT / 6:08 UTC.
Aug 27, 06:23 UTC
Aug 27, 06:23 UTC
Aug 26, 2025
Resolved -
We have seen errors return to the baseline level since 7:45 PT / 14:45 UTC.
Aug 26, 15:03 UTC
Aug 26, 15:03 UTC
Update -
We are continuing to investigate this issue.
Aug 26, 13:53 UTC
Aug 26, 13:53 UTC
Investigating -
We are currently investigating this issue.
Aug 26, 13:52 UTC
Aug 26, 13:52 UTC
Aug 25, 2025
Resolved -
This incident has been resolved.
Aug 25, 20:39 UTC
Aug 25, 20:39 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 25, 20:18 UTC
Aug 25, 20:18 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 25, 20:14 UTC
Aug 25, 20:14 UTC
Investigating -
Claude.ai is failing to downgrade MCP connections to SSE for a limited number of MCP servers. We are currently investigating.
Aug 25, 19:02 UTC
Aug 25, 19:02 UTC
Resolved -
This incident has been resolved. We identified a regression and deployed/monitored a fix over the weekend.
Aug 25, 18:32 UTC
Aug 25, 18:32 UTC
Investigating -
We are currently investigating this issue.
Aug 22, 17:19 UTC
Aug 22, 17:19 UTC
Aug 24, 2025
Resolved -
This incident has been resolved.
Aug 24, 09:20 UTC
Aug 24, 09:20 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 24, 08:19 UTC
Aug 24, 08:19 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 24, 08:03 UTC
Aug 24, 08:03 UTC
Investigating -
We are currently investigating this issue.
Aug 24, 07:20 UTC
Aug 24, 07:20 UTC
Aug 23, 2025
Resolved -
This incident has been resolved.
Aug 23, 01:45 UTC
Aug 23, 01:45 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 23, 01:30 UTC
Aug 23, 01:30 UTC
Investigating -
We are currently investigating this issue.
Aug 23, 00:55 UTC
Aug 23, 00:55 UTC
Resolved -
This incident has been resolved.
Aug 23, 00:56 UTC
Aug 23, 00:56 UTC
Update -
We are continuing to investigate this issue.
Aug 22, 23:39 UTC
Aug 22, 23:39 UTC
Investigating -
Starting ~15:50 PT for Opus 4 and ~11:40 PT for Opus 4.1
Aug 22, 23:39 UTC
Aug 22, 23:39 UTC
Aug 22, 2025
Resolved -
This incident has been resolved.
Aug 22, 22:59 UTC
Aug 22, 22:59 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 22, 22:06 UTC
Aug 22, 22:06 UTC
Resolved -
This incident has been resolved.
Aug 22, 22:30 UTC
Aug 22, 22:30 UTC
Update -
We are continuing to investigate this issue.
Aug 22, 22:14 UTC
Aug 22, 22:14 UTC
Update -
We are continuing to investigate this issue.
Aug 22, 22:12 UTC
Aug 22, 22:12 UTC
Update -
We are continuing to investigate this issue.
Aug 22, 21:37 UTC
Aug 22, 21:37 UTC
Investigating -
We are currently investigating this issue.
Aug 22, 21:36 UTC
Aug 22, 21:36 UTC
Resolved -
This incident has been resolved.
Aug 22, 15:59 UTC
Aug 22, 15:59 UTC
Update -
We are continuing to work on a fix for this issue.
Aug 22, 15:58 UTC
Aug 22, 15:58 UTC
Update -
We are continuing to work on a fix for this issue.
Aug 22, 14:57 UTC
Aug 22, 14:57 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 22, 14:57 UTC
Aug 22, 14:57 UTC
Aug 21, 2025
Resolved -
This incident has been resolved.
Aug 21, 17:13 UTC
Aug 21, 17:13 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 21, 15:36 UTC
Aug 21, 15:36 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 21, 13:45 UTC
Aug 21, 13:45 UTC
Investigating -
We are currently investigating this issue.
Aug 21, 13:39 UTC
Aug 21, 13:39 UTC
Resolved -
This incident has been resolved.
Aug 21, 13:33 UTC
Aug 21, 13:33 UTC
Monitoring -
A fix has been implemented and we are monitoring the results.
Aug 21, 13:25 UTC
Aug 21, 13:25 UTC
Identified -
The issue has been identified and a fix is being implemented.
Aug 21, 13:21 UTC
Aug 21, 13:21 UTC
Investigating -
We are currently investigating this issue.
Aug 21, 13:01 UTC
Aug 21, 13:01 UTC