claude-code - 💡(How to fix) Fix [Bug] Opus model defaults to 1M context window instead of native limit [1 participants]

[{"error":"Error: 429 {"type":"error","error":{"type":"rate_limit_error","message":"Extra usage is required for long context requests."},"request_id":"req_011CahxpoZ63Mx6mHTu1a1jg"}\n at generate (/$bunfs/root/src/entrypoints/cli.js:11:55186)\n at makeRequest (/$bunfs/root/src/entrypoints/cli.js:50:4943)\n at processTicksAndRejections (native:7:39)","timestamp":"2026-05-04T17:58:56.978Z"}]

TL;DR

Setting the CLAUDE_CODE_DISABLE_1M_CONTEXT environment variable to 1 may temporarily resolve the issue of Claude Code defaulting to a 1M context window when using Opus.

Guidance

• The error message indicates a rate limit error for long context requests, suggesting that the 1M context window is causing the issue.
• Verify that setting CLAUDE_CODE_DISABLE_1M_CONTEXT=1 consistently resolves the problem to confirm the workaround.
• Investigate the recent update that introduced this behavior to determine if it's a bug or an intended change.
• Consider reaching out to the developers or support team for a more permanent solution or clarification on the new default behavior.

Notes

The provided workaround may not be a permanent fix, and the root cause of the issue is unclear without more information about the recent update.

Recommendation

Apply workaround: setting CLAUDE_CODE_DISABLE_1M_CONTEXT=1 appears to resolve the issue, although it may not be a convenient or permanent solution.