Companies Anthropic Monthly reportsSeptember 2026

Anthropic in September 2026: incidents, uptime and changes

13incidents posted

8labelled major or critical

84.96%free of major/critical

84.50%free of any incident

0price changes

0notable page changes

Vendor-reported outage time 4.5 days, incident time 4.6 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: Major 8 · Minor 4 · No impact listed 1

Major and critical incidents 8

Incident	Impact	Started	Duration	Status	Day
Elevated errors for Claude Sonnet 5	Major	Sep 2, 21:17	26 min	resolved	09-02
Elevated errors for Claude Sonnet 5	Major	Sep 3, 12:37	19 min	resolved	09-03
Elevated errors for multiple models	Major	Sep 3, 13:26	3.0 h	resolved	09-03
Degraded functionality for Claude Cowork on Windows	Major	Sep 10, 15:54	4 d	resolved	09-10
Elevated errors for Claude Mythos 5.1 and Claude Fable 5.1	Major	Sep 11, 14:19	17 min	resolved	09-11
Intermittent error spikes for Claude Mythos 5.1 and Claude Fable 5.1	Major	Sep 15, 09:48	1.4 h	resolved	09-15
Elevated errors for multiple models	Major	Sep 22, 00:57	1.6 h	resolved	09-22
Elevated errors on claude.ai, Claude Code, Claude Cowork and the Claude API	Major	Sep 29, 14:21	2.1 h	resolved	09-29

Other incidents 5

Incident	Impact	Started	Duration	Status	Day
Degraded performance on Claude for Microsoft Office 365	Minor	Sep 1, 16:02	20 min	resolved	09-01
Degraded performance on platform.claude.com and Claude for Microsoft Office 365	Minor	Sep 1, 17:05	1.0 h	resolved	09-01
Delays in credit purchases	Minor	Sep 1, 23:26	2.0 h	resolved	09-01
Elevated latency on the Claude API for some users	Minor	Sep 10, 21:43	1.7 h	resolved	09-10
Issues with Google Play subscriptions	No impact listed	Sep 16, 16:18	33 min	resolved	09-16

CVEs published

CVE-2026-103012 (CVSS 2.0)

Cite this

Anthropic posted 13 status incidents in September 2026 (8 major or critical); 0 price changes and 0 notable page changes observed.

Title: Anthropic in September 2026
Vendor: Anthropic
Date: 2026-09-01 00:00 UTC
URL: https://rewindex.com/company/anthropic/2026/09

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