[BUG] CLAUDE_CODE_MAX_OUTPUT_TOKENS: Capped from 64000 to 32000 on v2.0.14

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?

CLAUDE_CODE_MAX_OUTPUT_TOKENS was set to 64K to match Sonnet 4.5 output limit, but as soon as I go over 32K, I get:

<img width="808" height="24" alt="Image" src="https://github.com/user-attachments/assets/8854b025-59fd-4b8a-bc50-ffe9a7ac6eac" />

And when I run doctor, it actually shows that it is capping the env variable from the 64K set to 32K output token.

<img width="325" height="248" alt="Image" src="https://github.com/user-attachments/assets/1f8373a6-aeff-4bbd-8c37-4af25ffa4aad" />

While on Claude official docs it states 64K:

<img width="201" height="305" alt="Image" src="https://github.com/user-attachments/assets/3e72204c-c1cd-4d26-b2f9-2aa22c7de707" />

What Should Happen?

The value of the env variable should be set to 64K, not capped to 32K.

export CLAUDE_CODE_MAX_OUTPUT_TOKENS = 64000

Error Messages/Logs

Steps to Reproduce

Set the variable:

export CLAUDE_CODE_MAX_OUTPUT_TOKENS = 64000

Run /doctor on Claude Code:

/doctor

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.0.14

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_

"env": {
    "CLAUDE_CODE_MAX_OUTPUT_TOKENS": "64000"
  }