Anthropic reported increased error rates for selected Claude models
Anthropic reported increased error rates on its status page for the models Claude Mythos 5, Fable 5 and Haiku 4.5 (the title also mentions Opus 5). claude.ai, API, Claude Code and Claude Cowork were affected; a fix was being implemented.
Anthropic reported increased error rates on its status page (Claude Status) for requests to models identified in the incident text as Claude Mythos 5, Claude Fable 5 and Claude Haiku 4.5. According to the record, the problem was initially under investigation and was subsequently identified, with a fix being implemented. The incident affected claude.ai, Claude API (api.anthropic.com), Claude Code and Claude Cowork.
The incident title also lists the model Opus 5, but it does not appear in the incident description itself – the source contradicts itself on this point, so we include both versions.
The source does not contain details (the exact timeline, error rate, resolution time). You can find details in the source article.
Why it matters
For developers and companies dependent on Claude API, this indicates that temporary errors during the period in question were related to an outage on the provider side rather than their own code – relevant to diagnostics and potentially reporting service availability to customers.
Two audiences, two different impacts
What this means
For individuals
Users of claude.ai, Claude API, Claude Code or Claude Cowork may have encountered error responses from the affected models at that time without there being a problem on their side.
For a business
Companies running products based on Claude API may have experienced increased call error rates during the incident, which is relevant to monitoring the availability and SLAs of dependent services.
Risks and complianceCheck the original
Event sources
clearly official source · 1 publisher, 0 independent. We count feeds from the same owner only once.