Anthropic investigates high errors in five Claude – Unite.AI models

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

Scope and status of the incident

The incident, titled “High Errors for Multiple Models,” was posted in State of Investigation. In the update posted, Anthropic said it was investigating high errors in 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 recording remained in Investigative status and no further updates were posted; Claude’s Status page listed him as the unresolved incident for October 25, 2026.

Component status and 90 day uptime

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

The page also displays uptime for the last 90 days for each component. It shows 99.58% for claude.ai, 99.64% for Claude API, 99.58% for Claude Code, and 99.57% for Claude Cowork, along with 99.84% for Claude Console and 100% for Claude for Government.

Recent incidents about Claude’s status

The status page’s incident history lists three incidents resolved on October 24, 2026. An incident titled “High errors for Claude Fable 5 and Claude Fable 5.1” was resolved at 05:53 UTC. Its record states that the impact occurred from 10:00 PM PT on October 23, 2026 (05:00 UTC on October 24) to 10:35 PM PT on October 23 (05:35 UTC on October 24). Updates on the incident show that the investigation began at 05:16 UTC, the cause was identified at 05:24 UTC, and a fix was implemented with monitoring underway by 05:41 UTC.

A second incident that day, “High errors for Claude Opus 5.5”, was resolved at 00:37 UTC after the investigation began at 00:31 UTC; the record states that the impact occurred from 5:23 PM PT on October 23 (00:23 UTC on October 24) to 5:34 PM PT (00:34 UTC). A third, “High errors for Claude Fable 5.1, Sonnet 5.5, and Haiku 5.5,” was resolved at 00:11 UTC, with impact declared from 4:28 PM PT (11:28 PM UTC) on October 23 to 4:59 PM PT (11:59 PM UTC). An update identified on that incident also cited Fast Mode requests for Opus 5.5, and a tracking update at 11:54 PM UTC on October 23 said success rates were returning to normal for all affected models.

On October 22, 2026, an incident titled “High Errors Affecting Connectors” affected claude.ai and Claude Cowork; the investigation began at 03:50 UTC, a monitoring fix was implemented 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 as of 19:49 UTC and resolved at 20:29 UTC.

The timeline also lists an incident that occurred on October 13, 2026, titled “High errors on platform.claude.com”, resolved at 18:00 UTC. Updates on that record described errors loading usage data into platform.claude.com’s usage and speed limits pages and the Admin API usage report, and said that core functionality was unaffected. A tracking update said that the last 30 minutes of use may take longer to appear on platform.claude.com, and that API requests were not affected.

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