# Anthropic: Claude Opus 4.1 and Opus 4 degraded quality

> Anthropic status incident “Claude Opus 4.1 and Opus 4 degraded quality” on 2025-08-29: impact minor (vendor’s label), 9.2 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/anthropic/incidents/h26lykctfnsz
Last updated: 2025-08-30T02:12:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2025-08-29 17:02 UTC · Resolved: 2025-08-30 02:12 UTC · Duration: 9.2 h
- Updates: 1
- [Vendor status page: https://status.anthropic.com/incidents/h26lykctfnsz](https://status.anthropic.com/incidents/h26lykctfnsz)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Timeline of updates

- **resolved** 2025-08-30 02:12 UTC: This incident has been resolved. We've published a technical postmortem on https://anthropic.com/engineering/a-postmortem-of-three-recent-issues.

_From the vendor’s published history: only the final update text is available for incidents before Rewindex began polling this page._

## Cite this

Status incident (vendor impact label: minor) posted by Anthropic, started 2025-08-29 17:02 UTC, resolved after 9.2 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/anthropic/incidents/h26lykctfnsz
- Citation: Anthropic, “Claude Opus 4.1 and Opus 4 degraded quality” (2025-08-29 17:02 UTC). Archived by Rewindex: https://rewindex.com/company/anthropic/incidents/h26lykctfnsz (CC BY 4.0).
- Markdown link: `[Anthropic: Claude Opus 4.1 and Opus 4 degraded quality (2025-08-29)](https://rewindex.com/company/anthropic/incidents/h26lykctfnsz)`


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Canonical: https://rewindex.com/company/anthropic/incidents/h26lykctfnsz · Markdown: https://rewindex.com/company/anthropic/incidents/h26lykctfnsz.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/h26lykctfnsz · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T22:02:37.476Z