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Recent Incidents · Last 7 days

Elevated errors for Claude Sonnet 5.5

Oct 27, 15:09 UTC · Resolved · 42m · major

Timeline · 2 updates

Identified · Oct 27, 15:09 UTC

We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

Resolved · Oct 27, 15:50 UTC

The issue affecting claude.ai, the Claude API, Claude Code, and Claude Cowork has been resolved. Impact occurred from 07:42 PT / 14:42 UTC to 08:17 PT / 15:17 UTC.

Elevated errors for Claude Sonnet 5.5

Oct 27, 09:14 UTC · Resolved · 43m · major

Timeline · 3 updates

Investigating · Oct 27, 09:14 UTC

We are investigating elevated errors on requests to Claude Sonnet 5.5. We will provide an update as soon as possible.

Monitoring · Oct 27, 09:38 UTC

A fix has been deployed for the issue affecting Claude services and we are monitoring for recovery.

Resolved · Oct 27, 09:56 UTC

The issue affecting Claude services has been resolved.

View 30-day history →

About Claude

AIWatch Data: Claude's reported uptime is 99.85%. Based on AIWatch data from the last 30 days, it experienced 11 incidents with an average recovery time of 34 minutes.

Claude is a large language model API developed by Anthropic. It powers applications ranging from chatbots to code generation tools, offering multiple model tiers for different performance and cost trade-offs.

When Claude API is down, developers may experience API request failures, increased latency, or model unavailability. Applications built on the Claude API will be unable to generate responses.

This page provides real-time status and recent incident details; uptime history is shown only when the official source publishes sufficient comparable records — updated every 5 minutes by AIWatch.

Common Claude errors

529 overloaded_errorProvider side

The API is temporarily overloaded. Anthropic notes it can occur when the API has high traffic across all users.

What to do: Retry with exponential backoff. The official SDKs retry it automatically, twice by default.

500 api_errorProvider side

An unexpected error inside Anthropic's systems.

What to do: Retry with exponential backoff. If it persists, contact Anthropic support with the request ID.

504 timeout_errorProvider side

The request timed out while processing.

What to do: Use the streaming Messages API for long-running requests.

429 rate_limit_errorYour request or account

Your organization hit a rate limit, its usage tier's monthly spend cap, or a spend limit on the Claude Code workspace.

What to do: Wait for the retry-after header. A spend-cap 429 has no retry-after header and keeps failing until access resumes.

400 invalid_request_errorYour request or account

A problem with the format or content of your request. Also returned when usage reaches a spend limit you set.

What to do: Read the error message and fix the request.

401 authentication_errorYour request or account

The API key is malformed, revoked, or expired.

What to do: Check which API key the request is using.

402 billing_errorYour request or account

A problem with your billing or payment information.

What to do: Check your payment details in the Claude Console.

403 permission_errorYour request or account

Your API key does not have permission to use the resource.

What to do: Check your organization's access and workspace settings in the Claude Console.

413 request_too_largeYour request or account

The request exceeds the maximum size (32 MB for the Messages API).

What to do: Send a smaller request.

Meanings from the Anthropic API error reference. AIWatch reads the official status page and cannot see the errors you get.

Frequently Asked Questions

Is Claude API down right now?

Check the live status indicator at the top of this page. AIWatch monitors Claude API every 5 minutes and shows real-time operational status, uptime percentage, and recent incidents.

How do I check Claude API status?

You can check Claude API status on this page (updated every 5 minutes), on the official Anthropic status page at status.claude.com, or on the AIWatch dashboard at ai-watch.dev.

What should I do when Claude API is down?

Consider switching to an alternative LLM API such as OpenAI or Gemini. AIWatch provides real-time fallback recommendations based on which services are currently operational and reliable.

How often does Claude API go down?

Claude API uptime and incident history are tracked on this page. Check the recent incidents section and uptime percentage for current reliability data.

What does Claude API error 529 overloaded_error mean?

A 529 overloaded_error means the API is temporarily overloaded. Anthropic's documentation says it can occur when the API has high traffic across all users, so it is not a rate limit on your account (that is a 429). Retry with exponential backoff, and check the live status at the top of this page.