Changes / Anthropic / Elevated errors across many models

Anthropic: Major incident: Elevated errors across many models

Summary

Anthropic reported a major incident with elevated errors across many models affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. It started at 2026-07-30 05:57 UTC and was resolved at 2026-07-30 10:48 UTC, lasting 4 h 51 min; models partially recovered before errors returned across all models.

Machine-written from the diff below (Sol; type: incident outage). Check the diff before relying on it.

Major incidentLabel: outage (model (Jev), 95%)Changed Detected Source: stspg.io

What changed

AddedTitle#1
Before: not present
After: Elevated errors across many models
AddedImpact#2
Before: not present
After: major
AddedStatus#3
Before: not present
After: resolved
AddedStart time#4
Before: not present
After: 2026-07-30 05:57 UTC
AddedResolved time#5
Before: not present
After: 2026-07-30 10:48 UTC
AddedAffected components#6
Before: not present
After: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
AddedUpdateinvestigating#7
Before: not present
After: We are currently investigating this issue.
AddedUpdateidentified#8
Before: not present
After: All models except Opus 5 have recovered. We're working to recover Opus 5 as well.
AddedUpdateidentified#9
Before: not present
After: As of 7:32 UTC / 0:32 PT, Opus 5 errors are back to baseline but we're seeing again Sonnet 5's errors up.
AddedUpdateidentified#10
Before: not present
After: As of 8:05 UTC / 1:05 PT, Sonnet 5 errors are back to baseline, but we're seeing an increased error rate on Fable 5.
AddedUpdateidentified#11
Before: not present
After: As of 01:33 PT / 08:33 UTC we are back to errors across all models.
AddedUpdatemonitoring#12
Before: not present
After: As of 2:58 PT / 9:58 UTC the errors are back to baseline.
AddedUpdatemonitoring#13
Before: not present
After: We are also investigating issues with Opus 4.7 and Opus 4.5.
AddedUpdateresolved#14
Before: not present
After: This incident has been resolved.

First version of this incident archived by Rewindex. View the live incident.

History of this incident

When (UTC)ChangeKind
Major incident: Elevated errors across many models (this change)
Anthropic reported a major incident with elevated errors across many models affecting claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. It started at 2026-07-30 05:57 UTC and was resolved at 2026-07-30 10:48 UTC, lasting 4 h 51 min; models partially recovered before errors returned across all models.
Major incident

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