# Anthropic: Elevated errors on Sonnet 4, Sonnet 4.5 and Haiku 4.5

- Impact (vendor’s label): major
- Status: resolved
- Started: 2025-11-20 08:10 UTC · Resolved: 2025-11-20 12:03 UTC · Duration: 3.9 h
- Updates: 1
- [Vendor status page: https://status.anthropic.com/incidents/xbbf1wq2dlz7](https://status.anthropic.com/incidents/xbbf1wq2dlz7)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Timeline of updates

- **resolved** 2025-11-20 12:03 UTC: As of 3:55 PT / 11:55 UTC the level of errors on Sonnet 4.0 has returned to normal.

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


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Canonical: https://rewindex.com/company/anthropic/incidents/xbbf1wq2dlz7 · Markdown: https://rewindex.com/company/anthropic/incidents/xbbf1wq2dlz7.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/xbbf1wq2dlz7 · Generated 2026-10-18T10:40:27.433Z