claude-code - 💡(How to fix) Fix [Bug] Anthropic API Error: 429 Rate Limit with Multiple Parallel Sessions Below Usage Cap [3 comments, 2 participants]

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/hyesungpark/.local/share/claude/versions/2.1.98 (expected in multi-process scenarios)\n at BU_ (/$bunfs/root/src/entrypoints/cli.js:2810:2153)\n at Ht6 (/$bunfs/root/src/entrypoints/cli.js:2810:1233)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-10T02:04:05.679Z"},{"error":"Error: 429 {"type":"error","error":{"type":"rate_limit_error","message":"This request would exceed your account's rate limit. Please try again later."},"request_id":"req_011CZuLQCeLX6FCcfoTzWZoc"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:52623)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-04-10T02:53:57.833Z"}]

TL;DR

Running multiple Claude Code sessions in parallel may be causing inconsistent rate limit errors, suggesting a potential issue with session-level throttling or account-level rate limiting.

Guidance

• Investigate the rate limiting behavior for multi-session usage to determine if it's a bug or incorrect configuration.
• Review the account's weekly cap and usage patterns to ensure that the total usage is not exceeding the expected limits.
• Consider reducing the number of parallel sessions or implementing a delay between requests to see if it mitigates the rate limit errors.
• Check the documentation for Claude Code to see if there are any specific guidelines for running multiple sessions in parallel.

Example

No code snippet is provided as it's not clearly supported by the issue.

Notes

The issue may be related to the specific version of Claude Code (2.1.98) or the platform (darwin) being used. Further investigation is needed to determine the root cause of the problem.

Recommendation

Apply a workaround by reducing the number of parallel sessions or implementing a delay between requests, as it may help mitigate the rate limit errors until the root cause is determined.