[BUG] Max Plan User Getting "Extra usage is required for long context requests" Error

Preflight Checklist

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

What's Wrong?

While on the Max plan, Claude Code repeatedly fails with a 429 Rate Limit Error when context usage increases. The API returns: "Extra usage is required for long context requests." This prevents the use of the 1M context window that is supposedly included in the Max tier.

What Should Happen?

According to the internal changelog (found in .claude/cache/changelog.md), the 1M context window for Opus should be available by default for Max, Team, and Enterprise plans without requiring "extra usage."

Error Messages/Logs

Request ID 1: req_011CZhUcvroqWbQUBQkSqqdU (Timestamp: 2026-04-03T20:34:37.243Z)
Request ID 2: req_011CZhUA4tztabcR88eUe2du (Timestamp: 2026-04-03T20:28:32.838Z)
Raw Error: 429 {"type":"error","error":{"type":"rate_limit_error","message":"Extra usage is required for long context requests."}}

Steps to Reproduce

1. Be on a Claude "Max" subscription plan.
2. Initialize a session in a large repository
3. Perform complex tasks or reviews that expand the context window (approx. 17k+ tokens in the failing session).
4. The CLI hits a 429 error instead of utilizing the extended context window.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.91.b42

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

The local cache file .claude/cache/changelog.md explicitly lists:

"- Added 1M context window for Opus 4.6 by default for Max, Team, and Enterprise plans (previously required extra usage)"

Despite this, the API still enforces the "Extra usage" requirement for this account. Requesting a verification of the billing/entitlement mapping for x-client-request-id: 324e9457-2a62-4bf4-8339-a0563917dd48.