# Anthropic: Elevated Sonnet 3.5 and Haiku error rate

> Anthropic status incident “Elevated Sonnet 3.5 and Haiku error rate” on 2024-10-21: impact minor (vendor’s label), 5.0 h, 1 update(s). Archived by Rewindex.

Canonical: https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j
Last updated: 2024-10-21T18:54:00Z

- Impact (vendor’s label): minor
- Status: resolved
- Started: 2024-10-21 13:57 UTC · Resolved: 2024-10-21 18:54 UTC · Duration: 5.0 h
- Updates: 1
- [Vendor status page: https://status.anthropic.com/incidents/wt8hdbnvl37j](https://status.anthropic.com/incidents/wt8hdbnvl37j)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Timeline of updates

- **resolved** 2024-10-21 18:54 UTC: This incident has been resolved. Free Claude.ai usage has been returned to 3.5 Sonnet.

_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 2024-10-21 13:57 UTC, resolved after 5.0 h, 1 update(s).

- Canonical URL: https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j
- Citation: Anthropic, “Elevated Sonnet 3.5 and Haiku error rate” (2024-10-21 13:57 UTC). Archived by Rewindex: https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j (CC BY 4.0).
- Markdown link: `[Anthropic: Elevated Sonnet 3.5 and Haiku error rate (2024-10-21)](https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j)`


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Canonical: https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j · Markdown: https://rewindex.com/company/anthropic/incidents/wt8hdbnvl37j.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/wt8hdbnvl37j · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-11-04T13:07:55.141Z