# Anthropic: claude.ai and Sonnet 4 errors

> Anthropic status incident “claude.ai and Sonnet 4 errors” on 2025-09-28: impact none (vendor’s label), 0 min, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs
Last updated: 2025-09-28T14:06:00Z

- Impact (vendor’s label): none
- Status: resolved
- Started: 2025-09-28 14:06 UTC · Resolved: 2025-09-28 14:06 UTC · Duration: 0 min
- Updates: 1
- [Vendor status page: https://status.anthropic.com/incidents/ht5r3583n1cs](https://status.anthropic.com/incidents/ht5r3583n1cs)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Timeline of updates

- **resolved** 2025-09-28 14:06 UTC: An issue affecting some claude.ai users of Sonnet 4 giving a 'conversation not found' error, has been resolved. All systems are now operating normally. We apologize for any inconvenience caused.

_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: none) posted by Anthropic, started 2025-09-28 14:06 UTC, resolved after 0 min, 1 update(s).

- Canonical URL: https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs
- Citation: Anthropic, “claude.ai and Sonnet 4 errors” (2025-09-28 14:06 UTC). Archived by Rewindex: https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs (CC BY 4.0).
- Markdown link: `[Anthropic: claude.ai and Sonnet 4 errors (2025-09-28)](https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs)`


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Canonical: https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs · Markdown: https://rewindex.com/company/anthropic/incidents/ht5r3583n1cs.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/ht5r3583n1cs · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T14:27:59.628Z