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claude-code - 💡(How to fix) Fix [BUG] [1 participants]

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anthropics/claude-code#45218•Fetched 2026-04-09 08:03:59
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andreiMproandreiMpro
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andreiMproandreiMpro
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Error Message

Error Messages/Logs

  1. Send any prompt — error appears immediately

Root Cause

On the Max plan, resuming a large Cowork session fails immediately. The session runs on claude-sonnet-4-6 and the transcript (~2.95 MB) exceeds the 200K standard window, so the runtime escalates to 1M context. Because the session is on Sonnet, this requires usage credits even on Max (per the model-config docs, only Sonnet 1M requires credits on Max; Opus 1M is included). The session should have been routed to opus[1m], which is covered by the subscription. CLAUDE_CODE_DISABLE_1M_CONTEXT=1 has no effect because the session genuinely cannot fit in 200K.

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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?

On the Max plan, resuming a large Cowork session fails immediately. The session runs on claude-sonnet-4-6 and the transcript (~2.95 MB) exceeds the 200K standard window, so the runtime escalates to 1M context. Because the session is on Sonnet, this requires usage credits even on Max (per the model-config docs, only Sonnet 1M requires credits on Max; Opus 1M is included). The session should have been routed to opus[1m], which is covered by the subscription. CLAUDE_CODE_DISABLE_1M_CONTEXT=1 has no effect because the session genuinely cannot fit in 200K.

What Should Happen?

On Max, an oversized session should be served by opus[1m] (included with the subscription) or otherwise not be gated behind usage credits. Cowork should not silently route it to sonnet[1m], which requires credits on Max.

Error Messages/Logs

Steps to Reproduce

  1. Max plan, Claude desktop app, Cowork
  2. Resume a large session (transcript well over 200K tokens)
  3. Send any prompt — error appears immediately

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

Claude 1.9659.2 (390d6c) 2026-05-28T21:50:01.000Z

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The issue with Claude Code v

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#integration issue#index setup#retrieval issue#search optimization#API routing

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