[MODEL] 'Claude Max Account' subscriber, but the 1M context window is not supported.

Preflight Checklist

• [x] I have searched existing issues for similar behavior reports
• [x] This report does NOT contain sensitive information (API keys, passwords, etc.)

Type of Behavior Issue

Other unexpected behavior

What You Asked Claude to Do

Hello. I am currently using Claude Code via the macOS iTerm2 terminal app with a 'Claude Max Account' subscription.

<img width="1019" height="365" alt="Image" src="https://github.com/user-attachments/assets/a8797b6f-fb49-4b53-8d4e-5c3a0cbd5064" />

I recently confirmed that Anthropic updated the Claude Opus 4.6 and Sonnet 4.6 models to natively support 1M context windows.

However, when I check the context window using the /context command, it still appears as 200K on my device.
(For reference, it shows 1M on other devices.)

<img width="485" height="217" alt="Image" src="https://github.com/user-attachments/assets/174bf564-bf9c-424b-99c3-b3cb0f46d7a5" />

Is there a solution for this? Or is this an undiscovered bug?

What Claude Actually Did

After running Claude Code, I ran the /model command to check 1M context window support, selected the opus 4.6 model, and then ran the /context command to check the context window.

Expected Behavior

In Claude Code, 1M context window support for Opus 4.6, Sonnet 4.6, and furthermore 'opusplan' models should be displayed correctly when using the /context command.

Files Affected

This input field does not apply to this post.

Permission Mode

Accept Edits was ON (auto-accepting changes)

Can You Reproduce This?

Yes, every time with the same prompt

Steps to Reproduce

After running Claude Code, I ran the /model command to check 1M context window support, selected the opus 4.6 model, and then ran the /context command to check the context window.

Claude Model

Opus

Relevant Conversation

Impact

Low - Minor inconvenience

Claude Code Version

2.1.76

Platform

Other

Additional Context

_No response_