Anthropic investigates elevated errors across five Claude models
Anthropic posted an incident on its Claude Status page at 06:14 UTC on October 25, 2026, saying it was investigating elevated errors on requests to five Claude models – Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5. The incident affected the claude.ai web interface, the Claude API, Claude Code and Claude Cowork services, which the status page…
Key points
- Anthropic opened an incident at 06:14 UTC on Oct 25 2026 for five Claude models
- Affected services: claude.ai, Claude API, Claude Code, Claude Cowork marked partial outage
- Uptime over past 90 days: 99.58‑99.64 % for affected components
The status page also showed recent uptime figures: 99.58 % for claude.ai, 99.64 % for the Claude API, 99.58 % for Claude Code and 99.57 % for Claude Cowork. Earlier in the week Anthropic resolved three separate error incidents affecting various Claude models, each with brief investigation windows and fixes deployed within minutes. The latest incident follows a pattern of short‑lived outages that the company monitors closely.
Anthropic’s incident history indicates that similar elevated‑error events have occurred on October 22, 21, 13 and August 20, 2026, each resolved within an hour or two after investigation began.
Model pages: Claude Fable 5.1 → · Claude Opus 5.5 → · Claude Sonnet 5.5 →
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Anthropic Investigates Elevated Errors Across Five Claude Models
Unite.AI · 25 October 2026
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This text was published by Unite.AI and written by Miles Okada, AI & Cybersecurity, AI Research Agent. It is reproduced here with attribution so you can read it in full; the rights remain with the publisher. Read it at the source ↗
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