Companies Anthropic Monthly reportsJanuary 2026

Anthropic in January 2026: incidents, uptime and changes

26incidents posted

6labelled major or critical

98.84%free of major/critical

88.42%free of any incident

0price changes

0notable page changes

Vendor-reported outage time 8 h 37 min, incident time 3.6 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 5 · Minor 20

Major and critical incidents 6

Incident	Impact	Started	Duration	Status	Day
Elevated error rates on Opus 4.5 and Sonnet 4.5	Critical	Jan 14, 08:34	5.7 h	resolved	01-14
Elevated rate of errors for multiple models	Major	Jan 12, 18:10	2.1 h	resolved	01-12
Increased rate of errors for Opus 4.5	Major	Jan 12, 19:21	53 min	resolved	01-12
Elevated errors on claude.ai	Major	Jan 22, 16:06	43 min	resolved	01-22
Claude Code Authentication Issues	Major	Jan 22, 16:22	27 min	resolved	01-22
Elevated error rates on claude.ai and API	Major	Jan 22, 22:19	7 min	resolved	01-22

Other incidents 20

Incident	Impact	Started	Duration	Status	Day
Errors on requests to Haiku 3.5	Minor	Jan 6, 00:26	3 min	resolved	01-06
Elevated error rates on Opus 4.5	Minor	Jan 7, 09:09	55 min	resolved	01-07
Claude subscription usage limits not visible in Claude.ai and Claude Code	Minor	Jan 7, 19:07	10.0 h	resolved	01-07
Increased latency on Sonnet 4.5	Minor	Jan 8, 17:23	4.6 h	resolved	01-08
New Subscription Activation & Payment Issues	Minor	Jan 9, 19:41	9.2 h	resolved	01-09
Degraded performance for API requests involving structured outputs.	Minor	Jan 10, 03:37	3.0 h	resolved	01-10
Elevated error rates on Sonnet 4.5 1M context	Minor	Jan 10, 14:33	1.1 h	resolved	01-10
Increased rate of errors for Opus 4.5	Minor	Jan 13, 07:27	22 min	resolved	01-13
Compaction is having issues	Minor	Jan 15, 07:28	9.6 h	resolved	01-15
Elevated errors on Claude Opus 4.5 and Sonnet 4.5	Minor	Jan 20, 16:41	53 min	resolved	01-20
Elevated errors on Claude Sonnet 4.5	Minor	Jan 21, 14:44	48 min	resolved	01-21
Elevated errors: Invalid `signature` in `thinking` block	Minor	Jan 23, 05:09	2.6 h	resolved	01-23
Increased rate of errors for Opus 4.5	Minor	Jan 25, 08:05	30 h	resolved	01-25
Elevated errors on Claude Haiku 3.5	Minor	Jan 27, 14:23	33 min	resolved	01-27
Degraded performance on Claude Console	Minor	Jan 27, 22:28	39 min	resolved	01-27
Elevated errors on Claude Sonnet 3.7	Minor	Jan 28, 10:13	23 min	resolved	01-28
Elevated errors on Claude Opus 4.5	Minor	Jan 28, 11:30	1.0 h	resolved	01-28
Elevated errors on Claude Opus 4.5	Minor	Jan 28, 13:52	22 min	resolved	01-28
Some users are experiencing delays in purchasing additional API credits	Minor	Jan 29, 19:10	1.5 h	resolved	01-29
Some users are experiencing memory leaks in Claude Code 2.1.27	Minor	Jan 31, 20:18	48 min	resolved	01-31

CVEs published

CVE-2026-0621 MCP TypeScript SDK UriTemplate Exploded Array Pattern ReDoS (CVSS 7.5)

Cite this

Anthropic posted 26 status incidents in January 2026 (6 major or critical); 0 price changes and 0 notable page changes observed.

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

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