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claude-code - 💡(How to fix) Fix [BUG] macOS Desktop 1.6608.2 - "Prompt is too long" error triggers persistent "Usage limit reached" state with full quota remaining

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Error Message

error triggers persistent "Usage limit reached" state with 3. Got "API Error: Prompt is too long" 4. After this error, the app shows "Usage limit reached" and where a "Prompt is too long" error corrupts the client-side

  1. Please investigate why this error puts the app into a

Error Messages/Logs

  1. Got "API Error: Prompt is too long"
  2. After this error, the app shows "Usage limit reached" and
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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?

Subject: [Bug] macOS Desktop 1.6608.2 - "Prompt is too long" error triggers persistent "Usage limit reached" state with full quota remaining

Hi team,

I'm on a Max 20x plan and hit a bug today (May 9, 2026) where my Claude Code session became completely unusable.

Environment:

  • App: Claude Desktop for macOS
  • Version: 1.6608.2 (ebf1a1), built 2026-05-08T23:17:27.000Z
  • Plan: Max 20x

Repro:

  1. Long Claude Code session using Opus 4.7 (Max mode), context built up over many turns
  2. Switched model to Sonnet 4.6 mid-session
  3. Got "API Error: Prompt is too long"
  4. After this error, the app shows "Usage limit reached" and the input box is greyed out — even in NEW sessions

Actual usage at the moment of failure (screenshot attached):

  • Current session (5h): 13% used
  • Weekly all models: 48% used
  • Sonnet only: 1% used
  • Claude Design: 0% used
  • Extra usage: OFF

So the "Usage limit reached" banner is clearly incorrect — I have ~87% of my session quota and ~52% of my weekly quota remaining. This appears related to issues #52249 and #56035 where a "Prompt is too long" error corrupts the client-side limit state.

Request:

  1. Please investigate why this error puts the app into a permanent locked state.
  2. Please credit back any quota consumed during the failed retries today.

Feedback ID / logs: [paste from Help → Send feedback if you have it]

Thanks, [你的名字]

What Should Happen?

\\

Error Messages/Logs

Steps to Reproduce

Repro:

  1. Long Claude Code session using Opus 4.7 (Max mode), context built up over many turns
  2. Switched model to Sonnet 4.6 mid-session
  3. Got "API Error: Prompt is too long"
  4. After this error, the app shows "Usage limit reached" and the input box is greyed out — even in NEW sessions

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude Desktop for macOS

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

<img width="1372" height="871" alt="Image" src="https://github.com/user-attachments/assets/603901df-1725-4e25-9fae-98910850b7ed" /> <img width="1148" height="234" alt="Image" src="https://github.com/user-attachments/assets/d0ff2b83-17b9-42e4-9699-761ff796f90b" /> <img width="1264" height="952" alt="Image" src="https://github.com/user-attachments/assets/c87245d0-655c-4227-b685-02b7f3d4c7e6" />

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claude-code - 💡(How to fix) Fix [BUG] macOS Desktop 1.6608.2 - "Prompt is too long" error triggers persistent "Usage limit reached" state with full quota remaining