ChangesAnthropicElevated errors for Claude Fable 5.1
Anthropic: Major incident: Elevated errors for Claude Fable 5.1
Anthropic reported a major incident involving elevated errors for Claude Fable 5.1 across claude.ai, Claude API - api.anthropic.com, Claude Code and Claude Cowork, starting 2026-10-25 08:17 UTC. It remained open when archived (open for 0 min at the last update); Anthropic said it identified the cause and was working on a fix, without detailing either.
Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.
Incident page: the full timeline of updates
What changed
Struck in red is what Anthropic removed; blue is what they added. Muted text is unchanged context.
First version of this incident archived by Rewindex. View the live incident (opens in new tab).
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.
After captured
In the 2026-10-25 checkpoint, timestamped by FreeTSA and DigiCert on . Record hash
e53f2c3f6dd882d4…
History of this incident
YesterdaySunday, October 25Sun, Oct 25
3 incident changes
- Normal progressIncident
Incident updateElevated errors for Claude Fable 5.1
- Normal progressIncident
Incident updateElevated errors for Claude Fable 5.1
- OutageMajor incident
Elevated errors for Claude Fable 5.1this change
Anthropic reported a major incident involving elevated errors for Claude Fable 5.1 across claude.ai, Claude API - api.anthropic.com, Claude Code and Claude Cowork, starting 2026-10-25 08:17 UTC. It remained open when archived (open for 0 min at the last update); Anthropic said it identified the cause and was working on a fix, without detailing either.