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claude-code - 💡(How to fix) Fix [BUG] Persistent ECONNRESET + 500 errors on all tasks — Max plan, macOS, 4 days

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Error Message

  • API Error: Unable to connect to API (ECONNRESET)
  • API Error: 500 status code (no body)

Error Messages/Logs

  1. Observe ECONNRESET or 500 error — either immediately or after 1-2 messages
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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?

Environment

  • macOS, Apple Silicon
  • Claude app v2.1.141
  • Max plan subscriber
  • 16 Cowork agents configured (all disabled)

What's wrong Every API call fails with either:

  • API Error: Unable to connect to API (ECONNRESET)
  • API Error: 500 status code (no body)

Affects Claude Code and Cowork. Claude.ai in browser works fine.

Duration 4 days, started May 13 2026. Has not resolved.

What I've tried

  • Full app reinstall + cache clear
  • Updated to v2.1.141
  • Killed all Claude processes
  • Firewall disabled
  • Network confirmed healthy (curl returns 404 in 0.05s)
  • Multiple new sessions
  • Disabled all Cowork agents
  • Restarted app many times

Pattern Simple tasks occasionally work. Anything compute-heavy (reading multiple files, running tests, deep research) fails immediately with ECONNRESET or 500.

Related issues #37077 #13657 #5674 #29591

Additional context Concurrent with spike in product API costs suggesting possible account-level rate limiting or session corruption. Simple claude.ai chat works fine throughout.

What Should Happen?

Claude Code and Cowork should complete compute-heavy tasks without connection errors, as they did reliably before May 13 2026. The app should maintain stable API connections throughout multi-step tasks on a Max plan subscription.

Error Messages/Logs

Steps to Reproduce

  1. Open Claude Code on macOS (v2.1.141)
  2. Start a new session with any compute-heavy task (e.g. read multiple files, run benchmarks, deep research)
  3. Observe ECONNRESET or 500 error — either immediately or after 1-2 messages
  4. Simple tasks ("hi", single file read) may occasionally succeed
  5. Reproducible across new sessions, new projects, after full app reinstall
  6. Has been consistent for 4 days across hundreds of attempts

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

2.1.143

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

Claude Desktop app (macOS, Apple Silicon)

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#api#memory optimization#batch processing#GPU compatibility#latency issue

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claude-code - 💡(How to fix) Fix [BUG] Persistent ECONNRESET + 500 errors on all tasks — Max plan, macOS, 4 days