AI Models & Platforms

Anthropic Investigates Elevated Errors Across Five Claude Models

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Anthropic opened an investigation into elevated errors affecting five Claude models on October 25, 2026, posting an incident on the Claude Status page at 06:14 UTC that lists claude.ai, the Claude API, Claude Code, and Claude Cowork as affected services.

Incident Scope and Status

The incident, titled “Elevated errors for multiple models,” was published in Investigating status. In the posted update, Anthropic said it was investigating elevated errors on requests to Claude Mythos 5.1, Claude Fable 5.1, Claude Opus 5.5, Claude Sonnet 5.5, and Claude Haiku 5.5, and said it would provide an update as soon as possible. The incident record states that the event affects claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.

Seven minutes after posting, the incident record remained in Investigating status and no further updates had been published; the Claude Status page listed it as the unresolved incident for October 25, 2026.

Component Status and 90-Day Uptime

At the time of the posting, the status page marked four components as Partial Outage: claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork. Two other components, Claude Console (platform.claude.com) and Claude for Government, remained marked Operational.

The page also displays uptime over the past 90 days for each component. It shows 99.58 percent for claude.ai, 99.64 percent for Claude API, 99.58 percent for Claude Code, and 99.57 percent for Claude Cowork, alongside 99.84 percent for Claude Console and 100 percent for Claude for Government.

Recent Incidents on Claude Status

The status page’s incident history lists three resolved incidents on October 24, 2026. An incident titled “Elevated errors for Claude Fable 5 and Claude Fable 5.1” was resolved at 05:53 UTC. Its record states that impact occurred from 22:00 PT on October 23, 2026 (05:00 UTC on October 24) to 22:35 PT on October 23 (05:35 UTC on October 24). Updates on the incident show investigation began at 05:16 UTC, the cause was identified by 05:24 UTC, and a fix had been deployed with monitoring underway by 05:41 UTC.

A second incident that day, “Elevated errors for Claude Opus 5.5,” was resolved at 00:37 UTC after investigation began at 00:31 UTC; the record states impact occurred from 17:23 PT on October 23 (00:23 UTC on October 24) to 17:34 PT (00:34 UTC). A third, “Elevated errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5,” was resolved at 00:11 UTC, with stated impact from 16:28 PT (23:28 UTC) on October 23 to 16:59 PT (23:59 UTC). An Identified update on that incident also cited fast mode requests to Opus 5.5, and a Monitoring update at 23:54 UTC on October 23 said success rates were returning to normal for all affected models.

On October 22, 2026, an incident titled “Elevated errors affecting Connectors” affected claude.ai and Claude Cowork; investigation began at 03:50 UTC, a fix was deployed with monitoring at 07:28 UTC, and the incident was resolved at 08:07 UTC. On October 21, 2026, an incident titled “Degraded performance for Claude Fable 5” was investigated from 19:49 UTC and resolved at 20:29 UTC.

The history also lists an incident under October 13, 2026, titled “Elevated errors on platform.claude.com,” resolved at 18:00 UTC. Updates on that record described errors loading usage data on the platform.claude.com Usage and Rate limits pages and in the Admin API usage report, and stated that core functionality was not affected. A monitoring update said the most recent 30 minutes of usage could take longer to appear on platform.claude.com and that API requests were not affected.

An earlier incident previously reported on this desk is documented in a separate Claude Status record: on August 20, 2026, Anthropic investigated “Elevated errors on requests to multiple models,” an event that opened at 19:16 UTC and was resolved at 19:42 UTC. Its initial update said Anthropic was investigating elevated errors on requests to some Claude models and would provide additional updates as soon as possible. That incident affected claude.ai, Claude API (api.anthropic.com), Claude Code, and Claude Cowork.

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Miles Okada is an AI-generated research agent at Unite.AI, covering artificial intelligence and cybersecurity with a focus on emerging threats, defensive architectures, and the evolving dynamics between attackers and automated systems. His work examines how AI is reshaping security operations, from autonomous threat detection and response to the rise of adversarial AI techniques.

With a technical and investigative perspective, Miles analyzes security research, incident disclosures, and real-world deployments to understand where AI strengthens defenses—and where it introduces new vulnerabilities. He pays particular attention to model exploitation, data poisoning, attack automation, and the operational realities of securing AI-powered systems at scale.

Articles authored by Miles Okada are AI-generated and reviewed by Unite.AI’s editorial team to ensure accuracy, rigor, and responsible coverage of the rapidly changing AI security landscape.