# Anthropic: Elevated errors for Claude Sonnet 5.5 and other models

- Impact (vendor’s label): major
- Status: resolved · edited after publishing
- Started: 2026-10-25 06:14 UTC · Resolved: 2026-10-25 07:53 UTC · Duration: 1.6 h
- Updates: 4 · Affected components: claude.ai, Claude API - api.anthropic.com, Claude Code, Claude Cowork
- [Vendor status page: https://status.claude.com/incidents/334jvgbrc4ff](https://status.claude.com/incidents/334jvgbrc4ff)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Discussed on Hacker News

- [Elevated errors for Claude Sonnet 5.5](https://news.ycombinator.com/item?id=50228908): 1 points, 1 comments, posted 2026-10-25 06:36 UTC, posted 22 min after the vendor’s first update

## Timeline of updates

- **investigating** 2026-10-25 06:14 UTC: We are investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. We will provide an update as soon as possible.
- **identified** 2026-10-25 06:27 UTC: We have identified the cause of elevated errors on requests to Claude Sonnet 5.5 and are working on a fix. We will provide an update as soon as possible.
- **monitoring** 2026-10-25 06:35 UTC: A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.
- **resolved** 2026-10-25 07:53 UTC: The issue affecting Claude services has been resolved. Impact occurred from 23:05 PT on October 24 / 06:05 UTC on October 25 to 23:35 PT on October 24 / 06:35 UTC on October 25.

## Rewindex changes for this incident

- 2026-10-25 06:14 UTC: [Major incident: Elevated errors for multiple models](https://rewindex.com/change/ifa13eb92497c13.md)
- 2026-10-25 06:34 UTC: [Incident updated: Elevated errors for Claude Sonnet 5.5](https://rewindex.com/change/r036167ecb0043f.md)
- 2026-10-25 06:43 UTC: [Incident updated: Elevated errors for Claude Sonnet 5.5 and other models](https://rewindex.com/change/rcb49fd8c32e091.md)
- 2026-10-25 08:03 UTC: [Incident updated: Elevated errors for Claude Sonnet 5.5 and other models](https://rewindex.com/change/r1cde1c7b4c8d54.md)


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Canonical: https://rewindex.com/company/anthropic/incidents/334jvgbrc4ff · Markdown: https://rewindex.com/company/anthropic/incidents/334jvgbrc4ff.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/334jvgbrc4ff · Generated 2026-10-25T09:06:25.495Z