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claude-code - 💡(How to fix) Fix [BUG] API Error 500 - Internal Server Error on all requests [1 comments, 2 participants]

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anthropics/claude-code#48627•Fetched 2026-04-16 06:55:16
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Error Message

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kE1cN76fPSj3AE77zU"}

Code Example

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kE1cN76fPSj3AE77zU"}

---

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kE1cN76fPSj3AE77zU"}
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Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

Bug Description Claude Code returns a persistent API 500 Internal Server Error, making it unable to process requests.

Error Message

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kE1cN76fPSj3AE77zU"}

Steps to Reproduce

  1. Open Claude Code in terminal
  2. Send any prompt
  3. Error returned immediately

Expected Behavior Normal response from Claude.

Actual Behavior Request fails with 500 api_error on every attempt.

Environment

  • Authentication: Claude Max subscription (OAuth)
  • Platform: Windows / WSL
  • Claude Code version: latest

Notes Retried multiple times. Issue persists across new sessions. Request ID attached for server-side tracing.

What Should Happen?

Claude Code should process the request normally and return a response from the model.

Error Messages/Logs

API Error: 500 {"type":"error","error":{"type":"api_error","message":"Internal server error"},"request_id":"req_011Ca5kE1cN76fPSj3AE77zU"}

Steps to Reproduce

  1. Open terminal and launch Claude Code
  2. Authenticate via Claude Max subscription (OAuth)
  3. Type any prompt (e.g. "Hello")
  4. Hit Enter
  5. Error is returned immediately instead of a model response
  6. Retried multiple times across new sessions — issue persists

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.109 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Cursor

Additional Information

No response

extent analysis

TL;DR

The most likely fix is to investigate and resolve the "Internal server error" on the Anthropic API side, potentially by checking the request ID for server-side tracing or reaching out to the API support team.

Guidance

  • Investigate the request ID "req_011Ca5kE1cN76fPSj3AE77zU" for server-side tracing to identify the root cause of the "Internal server error".
  • Verify if the issue persists across different prompts or if it's specific to certain inputs.
  • Check the Anthropic API status page for any ongoing issues or maintenance that might be causing the error.
  • Consider reaching out to the Anthropic API support team for further assistance, as the error message suggests a server-side issue.

Notes

The issue seems to be related to the Anthropic API, and resolving it might require cooperation with the API support team. The fact that it's a regression and worked in a previous version suggests that there might be a version-specific issue or a change in the API that's causing the problem.

Recommendation

Apply workaround: Reach out to the Anthropic API support team for assistance, as the error message indicates a server-side issue that cannot be resolved solely on the client-side.

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#api#tool integration#LLM response#prompt template#agent execution

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claude-code - 💡(How to fix) Fix [BUG] API Error 500 - Internal Server Error on all requests [1 comments, 2 participants]