[BUG] `ANTHROPIC_BASE_URL` ignored during setup

[wisepotato]

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?

From version 2.0.55 till 2.0.74, when you have a custom ANTHROPIC_BASE_URL, the initialisation of ~/.claude.json fails. It tries to connect to api.anthropic.com, which is blocked for our organisation. Moreover, I am able to get around this by installing 2.0.54 first, and then installing the latest (2.0.74) at this time.

I'm trying to provision claude code for 500+ people, so custom workarounds is something I'd like to prevent. After going past the "init" phase of getting ~/.claude.json created, I am able to upgrade, so my theory is that there is a bug in that part of the code. After upgrading ANTHROPIC_BASE_URL is respected again.

What Should Happen?

ANTHROPIC_BASE_URL should be respected on first run

Error Messages/Logs

Steps to Reproduce

Install latest version of claude code, with settings preconfigured in ~/.claude/settings.json to point to a different endpoint, that endpoint will not be respected. ~/.claude.json should not be present. It will not be created.

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.0.54

Claude Code Version

2.0.74

Platform

Other

Operating System

Other Linux

Terminal/Shell

Windows Terminal

Additional Information

This doesnt work on linux (alma), or windows (win 11)

[github-actions]

Found 2 possible duplicate issues:

1. [FEATURE] InputValidationError in sub-agent execution when using custom ANTHROPIC_BASE_URL #15249
2. [BUG] Claude code does not take Anthropic environment variables and not show colors in terminal #9283

This issue will be automatically closed as a duplicate in 3 days.

• If your issue is a duplicate, please close it and 👍 the existing issue instead
• To prevent auto-closure, add a comment or 👎 this comment

🤖 Generated with Claude Code

[wisepotato]

The duplicates are not the same, albeit related.

[EmptyDreams]

Encountered the same issue in 2.0.76.

[monadbobo]

I've encountered the same problem: the ANTHROPIC_BASE_URL env is not working.