# Anthropic in September 2025: incidents, uptime and changes

> Anthropic in September 2025: 35 incidents on its status page (5 major or critical), 76.43% free of major or critical incidents (vendor-reported). From Rewindex’s archive of Anthropic’s status, pricing and policy pages.

Canonical: https://rewindex.com/company/anthropic/2025/09
Last updated: 2025-10-01T15:01:00Z

- Incidents posted: 35 (major/critical: 5) · Maintenance: 0
- By vendor impact label: critical 1, major 4, minor 28, none 2
- Uptime (vendor-reported): 76.43% free of major/critical incidents, 71.26% free of any incident; outage time 7.1 days, incident time 8.6 days
- Price changes: 0 · Pricing/legal/trust page changes: 0 · Deprecations: 0 · CVEs: 0
- Previous month: [August 2025](https://rewindex.com/company/anthropic/2025/08.md) · Next: [October 2025](https://rewindex.com/company/anthropic/2025/10.md) · [All months](https://rewindex.com/company/anthropic/reports.md) · [Anthropic](https://rewindex.com/company/anthropic.md)

_Uptime: 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._

## Major and critical incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Claude App and API connectivity errors](https://rewindex.com/company/anthropic/incidents/xg2v4m4nc40n.md) | critical | 2025-09-22 20:58 UTC | 2025-09-22 21:30 UTC | 32 min | resolved |
| [Elevated error rates on API and claude.ai](https://rewindex.com/company/anthropic/incidents/072fdwqt08ps.md) | major | 2025-09-03 01:34 UTC | 2025-09-03 01:45 UTC | 11 min | resolved |
| [Model output quality](https://rewindex.com/company/anthropic/incidents/72f99lh1cj2c.md) | major | 2025-09-09 00:15 UTC | 2025-09-17 20:38 UTC | 9 d | resolved |
| [API, Claude.ai, and Console services impacted](https://rewindex.com/company/anthropic/incidents/k6gkm2b8cjk9.md) | major | 2025-09-10 16:28 UTC | 2025-09-10 17:36 UTC | 1.1 h | resolved |
| [Elevated errors across many models](https://rewindex.com/company/anthropic/incidents/pstkfl3t9jfd.md) | major | 2025-09-18 19:57 UTC | 2025-09-18 20:55 UTC | 58 min | resolved |

## All incidents

| Incident | Impact (vendor label) | Started (UTC) | Resolved (UTC) | Duration | Status |
| --- | --- | --- | --- | --- | --- |
| [Elevated errors on Claude 3.5 Sonnet (Oct 2024)](https://rewindex.com/company/anthropic/incidents/1y3qgxvtgwj9.md) | minor | 2025-09-01 07:14 UTC | 2025-09-01 08:55 UTC | 1.7 h | resolved |
| [Elevated error rates on API and claude.ai](https://rewindex.com/company/anthropic/incidents/072fdwqt08ps.md) | major | 2025-09-03 01:34 UTC | 2025-09-03 01:45 UTC | 11 min | resolved |
| [Elevated errors on Claude Opus 4.1](https://rewindex.com/company/anthropic/incidents/j6dxhkzm725w.md) | minor | 2025-09-03 06:39 UTC | 2025-09-03 07:59 UTC | 1.3 h | resolved |
| [Elevated errors on Claude Sonnet 4.0](https://rewindex.com/company/anthropic/incidents/k00ft02cpx7h.md) | minor | 2025-09-04 06:44 UTC | 2025-09-04 07:00 UTC | 16 min | resolved |
| [Elevated errors on Claude Haiku 3.5](https://rewindex.com/company/anthropic/incidents/clwd55p20y8z.md) | minor | 2025-09-04 13:57 UTC | 2025-09-04 14:59 UTC | 1.0 h | resolved |
| [Elevated errors on Claude 4.1 Opus](https://rewindex.com/company/anthropic/incidents/y0fmbh82qhyp.md) | minor | 2025-09-04 14:51 UTC | 2025-09-04 15:30 UTC | 39 min | resolved |
| [Unable to connect to MCP (Connectors), API Tools](https://rewindex.com/company/anthropic/incidents/8166jkm0njby.md) | minor | 2025-09-04 16:33 UTC | 2025-09-04 17:28 UTC | 55 min | resolved |
| [Certain Claude.ai Orgs Unable to Submit Messages](https://rewindex.com/company/anthropic/incidents/txhq1m8m1qsy.md) | minor | 2025-09-05 19:09 UTC | 2025-09-05 19:24 UTC | 15 min | resolved |
| [Unable to send messages to Opus 4.1](https://rewindex.com/company/anthropic/incidents/jd66f347jdfp.md) | minor | 2025-09-05 20:31 UTC | 2025-09-05 22:10 UTC | 1.6 h | resolved |
| [Model output quality](https://rewindex.com/company/anthropic/incidents/72f99lh1cj2c.md) | major | 2025-09-09 00:15 UTC | 2025-09-17 20:38 UTC | 9 d | resolved |
| [Elevated latency for some Sonnet 4 requests](https://rewindex.com/company/anthropic/incidents/c2hr706h1jhb.md) | minor | 2025-09-09 02:27 UTC | 2025-09-09 05:56 UTC | 3.5 h | resolved |
| [Elevated errors on Claude Sonnet 4.0](https://rewindex.com/company/anthropic/incidents/tngyvdmbgyws.md) | minor | 2025-09-10 07:32 UTC | 2025-09-10 09:25 UTC | 1.9 h | resolved |
| [API, Claude.ai, and Console services impacted](https://rewindex.com/company/anthropic/incidents/k6gkm2b8cjk9.md) | major | 2025-09-10 16:28 UTC | 2025-09-10 17:36 UTC | 1.1 h | resolved |
| [Claude.ai services impacted](https://rewindex.com/company/anthropic/incidents/p8pczg3gxg2k.md) | none | 2025-09-10 21:00 UTC | 2025-09-10 21:00 UTC | 0 min | resolved |
| [Elevated errors on Claude Opus 4.1](https://rewindex.com/company/anthropic/incidents/rl26g50jxn63.md) | minor | 2025-09-11 13:27 UTC | 2025-09-11 14:29 UTC | 1.0 h | resolved |
| [Elevated errors on Claude Sonnet 3.7](https://rewindex.com/company/anthropic/incidents/mp4tfl9fwdjc.md) | minor | 2025-09-12 22:40 UTC | 2025-09-12 22:40 UTC | 0 min | resolved |
| [Elevated errors on Claude Opus 4.1](https://rewindex.com/company/anthropic/incidents/jm3gbtk0vgnp.md) | minor | 2025-09-15 07:24 UTC | 2025-09-15 09:15 UTC | 1.9 h | resolved |
| [Elevated errors on Claude Haiku 3.5](https://rewindex.com/company/anthropic/incidents/grxm3346ch8b.md) | minor | 2025-09-15 11:07 UTC | 2025-09-15 12:25 UTC | 1.3 h | resolved |
| [Elevated errors on Claude Opus 4.1](https://rewindex.com/company/anthropic/incidents/sx3kpn28w4g1.md) | minor | 2025-09-15 11:22 UTC | 2025-09-15 12:25 UTC | 1.1 h | resolved |
| [Problems loading Claude.ai Artifacts](https://rewindex.com/company/anthropic/incidents/mtwbm879wdqn.md) | minor | 2025-09-16 00:57 UTC | 2025-09-16 01:24 UTC | 27 min | resolved |
| [Elevated errors on Claude 4 Sonnet](https://rewindex.com/company/anthropic/incidents/s1cd6vc8wms9.md) | minor | 2025-09-16 07:02 UTC | 2025-09-16 08:32 UTC | 1.5 h | resolved |
| [Elevated errors across many models](https://rewindex.com/company/anthropic/incidents/pstkfl3t9jfd.md) | major | 2025-09-18 19:57 UTC | 2025-09-18 20:55 UTC | 58 min | resolved |
| [\[retroactive\] Elevated errors on Claude Haiku 3.5 and Claude Haiku 3](https://rewindex.com/company/anthropic/incidents/f3p8ct8rb146.md) | minor | 2025-09-20 10:37 UTC | 2025-09-20 10:41 UTC | 4 min | resolved |
| [Elevated error rates on API and claude.ai](https://rewindex.com/company/anthropic/incidents/35ff8rq8c6lr.md) | minor | 2025-09-22 07:41 UTC | 2025-09-22 08:55 UTC | 1.2 h | resolved |
| [Claude App and API connectivity errors](https://rewindex.com/company/anthropic/incidents/xg2v4m4nc40n.md) | critical | 2025-09-22 20:58 UTC | 2025-09-22 21:30 UTC | 32 min | resolved |
| [Elevated error rates fetching images and PDFs on the API](https://rewindex.com/company/anthropic/incidents/hdq52ff34bbk.md) | minor | 2025-09-23 18:32 UTC | 2025-09-23 20:18 UTC | 1.8 h | resolved |
| [Elevated errors on Claude Opus 4 and Opus 4.1](https://rewindex.com/company/anthropic/incidents/9fw8j0rxtnff.md) | minor | 2025-09-24 08:02 UTC | 2025-09-24 09:11 UTC | 1.1 h | resolved |
| [Elevated error rates on API and claude.ai](https://rewindex.com/company/anthropic/incidents/mf6sw0fbyvvf.md) | minor | 2025-09-24 14:33 UTC | 2025-09-24 16:59 UTC | 2.4 h | resolved |
| [Elevated errors on Claude Sonnet 3.5 and 3.7](https://rewindex.com/company/anthropic/incidents/206nlm2l4ny5.md) | minor | 2025-09-25 00:52 UTC | 2025-09-25 03:05 UTC | 2.2 h | resolved |
| [Elevated errors on Claude Sonnet 3.5 and 3.7](https://rewindex.com/company/anthropic/incidents/73x33ml0lcsv.md) | minor | 2025-09-25 13:59 UTC | 2025-09-25 17:32 UTC | 3.5 h | resolved |
| [Elevated errors on Opus 4 and Sonnet 3.5 (new)](https://rewindex.com/company/anthropic/incidents/n9pl4hny4mlt.md) | minor | 2025-09-27 17:29 UTC | 2025-09-27 22:19 UTC | 4.8 h | resolved |
| [claude.ai and Sonnet 4 errors](https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs.md) | none | 2025-09-28 14:06 UTC | 2025-09-28 14:06 UTC | 0 min | resolved |
| [Elevated errors on Claude Sonnet 4](https://rewindex.com/company/anthropic/incidents/0y0rbk6ml533.md) | minor | 2025-09-30 07:33 UTC | 2025-09-30 08:38 UTC | 1.1 h | resolved |
| [Elevated errors on Claude Sonnet 4](https://rewindex.com/company/anthropic/incidents/61rby25lv6dx.md) | minor | 2025-09-30 09:59 UTC | 2025-09-30 14:10 UTC | 4.2 h | resolved |
| [Elevated errors](https://rewindex.com/company/anthropic/incidents/3fq7j7zbfrkm.md) | minor | 2025-09-30 18:55 UTC | 2025-10-01 15:01 UTC | 20 h | resolved |

## Cite this

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

- Canonical URL: https://rewindex.com/company/anthropic/2025/09
- Citation: Anthropic, “Anthropic in September 2025” (2025-09-01 00:00 UTC). Archived by Rewindex: https://rewindex.com/company/anthropic/2025/09 (CC BY 4.0).
- Markdown link: `[Anthropic: Anthropic in September 2025 (2025-09-01)](https://rewindex.com/company/anthropic/2025/09)`


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Canonical: https://rewindex.com/company/anthropic/2025/09 · Markdown: https://rewindex.com/company/anthropic/2025/09.md · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T11:08:54.423Z