Anthropic: Degraded performance on Claude Sonnet 5
Affected components: Claude CoworkClaude API (api.anthropic.com)claude.aiClaude Code
Timeline of updates
- investigating
We are currently investigating this issue.
- resolved
As of 15:20 UTC (8:20am PT), error rates on Claude Sonnet 5 have returned to baseline. This incident is resolved.
Archive proof
Rewindex commits each version of an incident it captures to a daily checkpoint, chains it to the day before, and has the checkpoint timestamped by FreeTSA and DigiCert. That proves this record existed by then and has not been changed since, by anyone, Rewindex included.
How the archive is checked, and what it cannot prove.
First version captured
In the 2026-10-17 checkpoint, timestamped by FreeTSA and DigiCert on . Record hash
b5531d76a3e8e0d7…
Impact, status and times are the vendor’s own, as last archived. View on stspg.io (opens in new tab).
Cite this
Status incident (vendor impact label: minor) posted by Anthropic, started 2026-08-03 15:13 UTC, resolved after 15 min, 2 update(s).
- Title
- Degraded performance on Claude Sonnet 5
- Vendor
- Anthropic
- Date
- URL
- https://rewindex.com/company/anthropic/incidents/dnl3q35xkn3s
Anthropic profileRecent Anthropic incidentsAll outages on August 3, 2026Anthropic in August 2026MarkdownJSON