# Anthropic: Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5

- Impact (vendor’s label): major
- Status: resolved
- Started: 2026-08-13 14:33 UTC · Resolved: 2026-08-13 16:08 UTC · Duration: 1.6 h
- Updates: 3 · Affected components: Claude Cowork, Claude API (api.anthropic.com), claude.ai, Claude Code
- [Vendor status page: https://stspg.io/pbnrks0mrn4w](https://stspg.io/pbnrks0mrn4w)
- [Company: Anthropic](https://rewindex.com/company/anthropic.md)

## Summary

Anthropic reported a major incident with elevated request errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5, affecting claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork. It started at 2026-08-13 14:33 UTC and was resolved at 2026-08-13 16:08 UTC, lasting 1 h 34 min; no cause or fix was stated. _(machine-written, sol)_
## Timeline of updates

- **investigating** 2026-08-13 14:33 UTC: We are investigating elevated errors on requests to Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5. We will provide an update as soon as possible.
- **investigating** 2026-08-13 15:44 UTC: We are investigating elevated errors on requests to Claude Mythos 5 and Claude Fable 5. We will provide an update as soon as possible.
- **resolved** 2026-08-13 16:08 UTC: The issue affecting Claude Mythos 5 and Claude Fable 5 has been resolved.

## Rewindex changes for this incident

- 2026-08-13 14:33 UTC: [Major incident: Elevated errors for Claude Mythos 5, Claude Fable 5, and Claude Sonnet 5](https://rewindex.com/change/i13ed245b86f46f.md)


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Canonical: https://rewindex.com/company/anthropic/incidents/j160kkjmm2n1 · Markdown: https://rewindex.com/company/anthropic/incidents/j160kkjmm2n1.md · JSON: https://rewindex.com/api/v1/companies/anthropic/incidents/j160kkjmm2n1 · Generated 2026-10-18T09:46:15.019Z