Companies Anthropic Monthly reportsDecember 2025

Anthropic in December 2025: incidents, uptime and changes

21incidents posted

8labelled major or critical

99.20%free of major/critical

83.77%free of any incident

0price changes

0notable page changes

Vendor-reported outage time 5 h 55 min, incident time 5.0 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 3 · Major 5 · Minor 11 · No impact listed 2

Major and critical incidents 8

Incident	Impact	Started	Duration	Status	Day
Claude.ai is unavailable	Critical	Dec 5, 2025, 09:02	31 min	resolved	12-05
Elevated errors across many models	Critical	Dec 14, 2025, 21:31	1.3 h	resolved	12-14
Cannot create new conversations on Claude.ai	Critical	Dec 16, 2025, 16:23	20 min	resolved	12-16
Elevated errors on claude.ai	Major	Dec 2, 2025, 16:34	1.6 h	resolved	12-02
Elevated errors on Claude Haiku 4.5 and Opus 4.5	Major	Dec 3, 2025, 12:20	9 min	resolved	12-03
Claude.ai is unavailable	Major	Dec 5, 2025, 10:47	40 min	resolved	12-05
Unable to start chats on claude.ai	Major	Dec 12, 2025, 08:00	0 min	resolved	12-12
New chats defaulting to Claude Opus	Major	Dec 16, 2025, 19:30	1.4 h	resolved	12-16

Other incidents 13

Incident	Impact	Started	Duration	Status	Day
Investigating reports of increased latency	Minor	Dec 1, 2025, 22:09	2.1 h	resolved	12-01
Elevated Error Rates on Claude API Code Execution and Advanced File Analysis Tools	No impact listed	Dec 5, 2025, 01:09	0 min	resolved	12-05
iOS Subscription Access Issues	Minor	Dec 8, 2025, 01:00	4 d	resolved	12-08
Research on claude.ai down	Minor	Dec 10, 2025, 19:44	37 min	resolved	12-10
Elevated errors on documentation site in Europe	No impact listed	Dec 12, 2025, 17:10	1.8 h	resolved	12-12
Unable to view shared chats on claude.ai	Minor	Dec 15, 2025, 18:39	50 min	resolved	12-15
Elevated error rates on Sonnet 4	Minor	Dec 17, 2025, 10:45	35 min	resolved	12-17
Elevated error rates on Sonnet 4.5	Minor	Dec 19, 2025, 04:34	9.3 h	resolved	12-19
Claude Code on Windows rendering improperly	Minor	Dec 19, 2025, 20:30	1.7 h	resolved	12-19
Research unavailable for some teams orgs	Minor	Dec 20, 2025, 00:51	44 min	resolved	12-20
Elevated error rates on Opus 4.5	Minor	Dec 21, 2025, 13:16	1.3 h	resolved	12-21
Elevated error rates on Opus 4.5	Minor	Dec 22, 2025, 07:18	2.2 h	resolved	12-22
Elevated error rates on Opus 4.5	Minor	Dec 23, 2025, 09:55	56 min	resolved	12-23

Cite this

Anthropic posted 21 status incidents in December 2025 (8 major or critical); 0 price changes and 0 notable page changes observed.

Title: Anthropic in December 2025
Vendor: Anthropic
Date: 2025-12-01 00:00 UTC
URL: https://rewindex.com/company/anthropic/2025/12

All Anthropic months Recent incidents Markdown