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CompaniesAnthropicMonthly reportsSeptember 2025

Anthropic in September 2025: incidents, uptime and changes

35incidents posted
5labelled major or critical
76.43%free of major/critical
71.26%free of any incident
0price changes
0notable page changes

Vendor-reported outage time 7.1 days, incident time 8.6 days. Derived from the incidents the vendor posted on its own status page, not measured by us. A minute counts as an outage minute when a major or critical incident (as the vendor labelled it) was open; incident minutes include minor ones too. Maintenance and incidents marked "no impact" are left out, overlapping incidents are merged, a resolved incident counts for at most 7 days, and one still open with no resolution counts for at most 24 hours. Last 90 days.

By vendor label: Critical 1 · Major 4 · Minor 28 · No impact listed 2

Major and critical incidents 5

IncidentImpactStartedDurationStatusDay
Claude App and API connectivity errorsCritical32 minresolved09-22
Elevated error rates on API and claude.aiMajor11 minresolved09-03
Model output qualityMajor9 dresolved09-09
API, Claude.ai, and Console services impactedMajor1.1 hresolved09-10
Elevated errors across many modelsMajor58 minresolved09-18

Other incidents 30

IncidentImpactStartedDurationStatusDay
Elevated errors on Claude 3.5 Sonnet (Oct 2024)Minor1.7 hresolved09-01
Elevated errors on Claude Opus 4.1Minor1.3 hresolved09-03
Elevated errors on Claude Sonnet 4.0Minor16 minresolved09-04
Elevated errors on Claude Haiku 3.5Minor1.0 hresolved09-04
Elevated errors on Claude 4.1 OpusMinor39 minresolved09-04
Unable to connect to MCP (Connectors), API ToolsMinor55 minresolved09-04
Certain Claude.ai Orgs Unable to Submit MessagesMinor15 minresolved09-05
Unable to send messages to Opus 4.1Minor1.6 hresolved09-05
Elevated latency for some Sonnet 4 requestsMinor3.5 hresolved09-09
Elevated errors on Claude Sonnet 4.0Minor1.9 hresolved09-10
Claude.ai services impactedNo impact listed0 minresolved09-10
Elevated errors on Claude Opus 4.1Minor1.0 hresolved09-11
Elevated errors on Claude Sonnet 3.7Minor0 minresolved09-12
Elevated errors on Claude Opus 4.1Minor1.9 hresolved09-15
Elevated errors on Claude Haiku 3.5Minor1.3 hresolved09-15
Elevated errors on Claude Opus 4.1Minor1.1 hresolved09-15
Problems loading Claude.ai ArtifactsMinor27 minresolved09-16
Elevated errors on Claude 4 SonnetMinor1.5 hresolved09-16
[retroactive] Elevated errors on Claude Haiku 3.5 and Claude Haiku 3Minor4 minresolved09-20
Elevated error rates on API and claude.aiMinor1.2 hresolved09-22
Elevated error rates fetching images and PDFs on the APIMinor1.8 hresolved09-23
Elevated errors on Claude Opus 4 and Opus 4.1Minor1.1 hresolved09-24
Elevated error rates on API and claude.aiMinor2.4 hresolved09-24
Elevated errors on Claude Sonnet 3.5 and 3.7Minor2.2 hresolved09-25
Elevated errors on Claude Sonnet 3.5 and 3.7Minor3.5 hresolved09-25
Elevated errors on Opus 4 and Sonnet 3.5 (new)Minor4.8 hresolved09-27
claude.ai and Sonnet 4 errorsNo impact listed0 minresolved09-28
Elevated errors on Claude Sonnet 4Minor1.1 hresolved09-30
Elevated errors on Claude Sonnet 4Minor4.2 hresolved09-30
Elevated errorsMinor20 hresolved09-30

Cite this

Anthropic posted 35 status incidents in September 2025 (5 major or critical); 0 price changes and 0 notable page changes observed.

Title
Anthropic in September 2025
Vendor
Anthropic
Date
URL
https://rewindex.com/company/anthropic/2025/09

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