Claude Opus 5 and Sonnet 5 suffered a separate developer-facing degradation

Claude Opus 5 and Sonnet 5 experienced a separate period of elevated errors on 17 August.

Human reviewed · generated by codex/gpt-5.6-luna

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Summary

Anthropic opened a separate incident at 13:56:41 UTC for elevated errors on Claude Opus 5, later reporting that Sonnet 5 was degraded as well. Claude.ai, the API, Claude Code and Claude Cowork were marked operational again at 15:29:25 UTC.

Why it matters

Model-specific failures make fallback, routing and workload isolation practical requirements for teams building on coding-agent and API platforms.

Claude API and Claude Code outage interrupted multiple Anthropic services
Cloudflare reported elevated Durable Objects errors in Singapore
GitHub outage disrupted repository downloads and Copilot

Sources

https://status.claude.com/api/v2/incidents.json

Summary

Why it matters

Related coverage

Sources