Claude Status · History · Incident #6510

RESOLVED

Degraded performance for multiple models

Minor · Started Aug 18, 2026 · 4:20 PM

Duration

2h 41m
Severity

Minor
Detection lead

—
User reports

Peak 63/hr

Summary

Degraded performance for multiple models

The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC.

Started

Aug 18, 2026 · 4:20 PM
Resolved

Aug 18, 2026 · 7:01 PM
Duration

2h 41m
Severity

Minor

Event timeline

How this incident unfolded

◐

Investigating
Aug 18 · 4:20 PM Claude

We are investigating reports of degraded performance affecting multiple models. We will provide an update as soon as possible.
◐

Investigating
Aug 18 · 4:20 PM Claude

We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, Claude Opus 5, Claude Sonnet 5, Claude Haiku 4.5, and other Claude models. We will provide an update as soon as possible.
◐

Investigating
Aug 18 · 5:12 PM Claude

We are investigating elevated errors on requests to Claude Opus 5. We will provide an update as soon as possible.
◉

Monitoring
Aug 18 · 6:26 PM Claude

A fix has been implemented and we are monitoring the results.
✓

Resolved
Aug 18 · 7:01 PM Claude

The issue affecting Claude Opus 5 has been resolved. Impact occurred from 16:11 to 18:23 UTC.

User reports · incident window

Report volume over time

Hourly report count. Red bars mark the incident window.

Peak: 63 reports/hr

← Before incident After →

Pattern

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