[Bug] Anthropic API Error: Internal Server Error (500)

Found 3 possible duplicate issues:

1. https://github.com/anthropics/claude-code/issues/21442
2. https://github.com/anthropics/claude-code/issues/21443
3. https://github.com/anthropics/claude-code/issues/21444

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🤖 Generated with Claude Code

Same issue for over 1h but status page seems fine.

https://status.claude.com/

This has become quite ridiculous between this and the API Connection error. I can't actually depend on Claude Code to operate normally & smoothly any day. Claude actually acknowledges, yet it seems to be radio silence from Anthropic?

Looks like it has died again

ok so its our day off

Me too, how long does this usually last for?

Yes, it died 30 minutes ago.

Same problem here

This issue was reported as early as July 2025, but is still occurring. Anthropic, please prioritise this.

same

same

Status page just updated:

Elevated error rate on API across all Claude models Identified - The issue has been identified and a fix is being implemented. Feb 03, 2026 - 15:46 UTC

same issue
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CXmQKuoh6z7w9pMCrEus1"}

works

Still down?

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server
error"},"request_id":"req_011CXoMXG9H1ouBVEh4kUd5v"}

still getting this error as well

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CYNtneTMoMmxgi8JP2fvV"}

makes it very hard to do work, I've been getting it a lot today. Please investigate, it is in internal error.
unfortunately, this turn claude into a time-waster instead of saver.
It is hard to tell, but it sometimes it feels like it can answer easy things, but when it gets hard it gives that. or it is because the context has made it hard already. because it works either randomly or not depending on the prompt. I was using Opus 4.6, even after switching to Sonnet 4.6, I get failures on a completely new session both in the same session.
Opus 4.6
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CYNuffmurJwcNfScffqFt"}
Sonnet 4.6
API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011CYNun6Se1JYTPKtnyqTte"}

Usage: Current session = 3% used, Weekly all models = 56% used (MAX20X)

Claude Desktop Code

This might be helpful to other: From https://support.claude.com/en/ support chatbot they say:

I can see you're experiencing HTTP 500 "Internal server error" responses with both Opus 4.6 and Sonnet 4.6. This is a known issue that we've been tracking. Looking at our recent incident history, there have been multiple resolved incidents involving elevated error rates on both Opus 4.6 and Sonnet 4.6 models over the past few days, with the most recent "Opus 4.6 elevated error rates" incident resolved on February 21st at 23:11 UTC. HTTP 500 errors indicate "an unexpected error has occurred internal to Anthropic's systems" rather than an issue with your setup. Since you're seeing this across different models and new sessions, this suggests a system-wide issue rather than something specific to your account or requests. While I don't have full information about current system status, here's what you can do: Immediate steps: - Wait a few minutes and retry your requests - Try switching between available models if one is working better - Check our status page at https://status.anthropic.com/ for any ongoing incidents For API users: - Implement retry logic with exponential backoff for 500 errors - Consider using the streaming API or Message Batches API for longer requests These types of capacity constraint errors typically resolve automatically as our systems stabilize, usually within minutes to a few hours.

Hi folks, thanks for reporting this. These 500 errors were caused by transient API outages on the Anthropic side — not a bug in Claude Code itself. The API is currently healthy, so I'm closing this out. If you're still experiencing 500 errors, you can check the API status at https://status.anthropic.com, and if the issue persists while the status page is green, please open a new issue with your request ID and we'll investigate.

This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.