Desktop Code tab uses 200k context instead of 1M on Max plan (Windows)

[Ravi2k3]

Bug Description

The Claude Desktop Code tab does not activate the 1M context window for Opus 4.6 on a Max plan. It shows claude-opus-4-6 with 200k context, while the terminal CLI on the same machine correctly shows claude-opus-4-6[1m] with 1M context.

Steps to Reproduce

1. Open Claude Desktop (Windows) → Code tab
2. Send a message, then run /context
3. Observe: claude-opus-4-6 · 200k tokens
4. Open a terminal, run claude, then /context
5. Observe: claude-opus-4-6[1m] · 1000k tokens

Expected Behavior

The Desktop Code tab should use claude-opus-4-6[1m] with 1M context on Max plans, matching the terminal CLI behavior.

Environment

• Platform: Windows 11 Pro (10.0.26200)
• Claude Desktop version: Latest (Code tab)
• Claude CLI version: 2.1.78
• Plan: Claude Max
• Model shown in Desktop Code tab: claude-opus-4-6 (200k)
• Model shown in terminal CLI: claude-opus-4-6[1m] (1M)

Troubleshooting Attempted

• Cleared Desktop app cache and session storage → no change
• Restarted Desktop app → no change
• Removed ANTHROPIC_DEFAULT_OPUS_MODEL env override from settings.json → no change
• Terminal CLI works correctly with 1M — issue is isolated to the Desktop Code tab

Additional Context

The model dropdown at the bottom of the Desktop Code tab shows "Opus 4.6" with no option for the 1M variant. On Max plans, 1M should be the default automatically.

[bill2471]

SAME FOR ME

[thomassauve26]

check my issue it's the same for me but instead I have actually access to opus 1M but not to sonnet 1M on Claude code. Don't have access to Sonnet 1M on desktop either

[Fuitad]

I have the same issue as @thomassauve26. I get 1M on Opus but not Sonnet. I'm on OSX.

[dcthomas0518]

Same happened after restarting to the latest version of Claude Desktop on Windows. Prior to restarting, Opus 4.6 (1M) was the default model. Now it's only showing Opus 4.6 in the model picker.

[CalebC83]

Same issue here. Windows 10, Max plan, Claude Desktop Code tab. Had Opus 4.6 (1M) available on March 18, gone as of March 19. Model picker only shows "Opus 4.6" (200k).

Debugging notes: ANTHROPIC_API_KEY env var is being injected as an empty string in the Desktop Code environment, while CLAUDE_CODE_OAUTH_TOKEN is present and valid. Suspect the empty API key is causing the backend to fall back to API-tier context limits instead of recognizing Max plan entitlements via OAuth.

Happy to provide additional diagnostic info if helpful.