Increased error rates for Claude Fable 5, Sonnet 5, Haiku 4.5 and other models
Anthropic reports increased request error rates for Claude Fable 5, Claude Sonnet 5, Claude Haiku 4.5 and other models on the status page. claude.ai, Claude API, Claude Code and Claude Cowork are affected, and the cause is being investigated.
Anthropic announced on the Claude Status page that it is investigating increased request error rates for Claude Fable 5, Claude Sonnet 5, Claude Haiku 4.5 and other Claude models. The incident was posted on 25 July 2026 at 21:34 UTC.
According to Anthropic, the incident affects claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork. The company said it would provide an update as soon as possible; neither an estimated resolution time nor the cause of the problem is known at this time. Details can be found in the source article.
Why it matters
Anyone currently using claude.ai, Claude API, Claude Code or Claude Cowork risks failed or slow responses from the affected models for the duration of the incident. For production integrations built on Claude API, this means a higher error rate until Anthropic resolves the problem.
Two audiences, two different impacts
What this means
For individuals
If you are currently working with Claude Code, claude.ai or using Fable 5, Sonnet 5 or Haiku 4.5 models through the API, you may encounter error responses.
For a business
Companies with production systems that depend on Claude API may experience increased request error rates for the duration of the incident, affecting the reliability of downstream services.
Risks and complianceCheck the original
Event sources
clearly official source · 1 publisher, 0 independent. We count feeds from the same owner only once.