[BUG] Max 5x: Session limits depleting 3-4x faster than normal since June 24, 2026 (claude.ai web)

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?

Since the evening of June 24, 2026, my 5-hour session window on Max 5x
is depleting abnormally fast on claude.ai web (not Claude Code CLI).

37% of session consumed after ~30 minutes of normal chat work using
Sonnet model. Previously I could work 4-5 hours without hitting limits.
Same workflow, no changes on my end.

Weekly limit is only 25% used — so this is not a weekly cap issue.
This is purely a session (5-hour window) accounting problem.

What Should Happen?

Max 5x session window should last ~5 hours of normal usage, consistent with behavior prior to June 24, 2026.

Error Messages/Logs

Steps to Reproduce

1. Open claude.ai web on Max 5x plan
2. Have a normal chat session using Sonnet model
3. Check Settings > Usage after 30 minutes
4. Observe: session bar shows 37%+ consumed vs expected ~10%

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.143

Claude Code Version

2.1.144

Platform

Other

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

This issue affects claude.ai web interface, not Claude Code CLI.
Related issues: #38335, #52135, #69608