# Anthropic: Degraded performance for multiple models

- Provider: [Anthropic](https://outages.cc/anthropic.md)
- Type: Incident
- State: Resolved
- Worst impact: Degraded performance
- Started: 2026-08-18 16:20 UTC
- Resolved: 2026-08-18 19:01 UTC (lasted 2 h 41 min)
- Components: claude.ai, Claude API (api.anthropic.com), Claude Code, Claude Cowork
- Official update: https://stspg.io/tcsfmtc03xgm

## Updates from Anthropic

### resolved, 2026-08-18 19:01 UTC

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

### monitoring, 2026-08-18 18:26 UTC

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

### investigating, 2026-08-18 17:12 UTC

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

### investigating, 2026-08-18 16:20 UTC

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, 2026-08-18 16:20 UTC

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