[BUG] Sonnet 4.6 1m missing from Max plan

[acq23]

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?

Sonnet 4.6 1m is not available: just the 200k context version.
Trying to force it with /model gives the error --> not included in the plan.

What Should Happen?

Sonnet 4.6 1m must be the default for the max plan

Error Messages/Logs

Sonnet 4.6 with 1M context is not available for your account. Learn more:
     https://code.claude.com/docs/en/model-config#extended-context-with-1m

Steps to Reproduce

1. Enter the interface
2. /model
3. select sonnet 4.6
4. /context --> context is 200k
5. /model sonnet[1m]
6. Error Sonnet 4.6 with 1M context is not available for your account. Learn more:
   https://code.claude.com/docs/en/model-config#extended-context-with-1m

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

No response

Claude Code Version

v2.1.195

Platform

Other

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Other

Additional Information

Terminal Gostty
Claude Code CLI

[github-actions]

Found 3 possible duplicate issues:

1. Sonnet 4.6 1M context unavailable on Max 20x plan - only Opus 1M appears in /model #34773
2. Opus 4.6 shows 200K context instead of 1M on Claude Max plan (v2.1.75) #34143
3. Opus 4.7 ([1m] variant) capped at 200K context in Claude Code Desktop on Max plan #55504

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