[BUG] /model redirects to usage-credits page for Fable 5 despite plenty of weekly quota remaining (Max 5x plan)

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?

Running /model and attempting to switch to Fable 5 does not switch the model. Instead, the CLI opens the browser to the usage-credits top-up page (claude.ai/settings/usage?from=cc_cli_limit_message) with the message "Once topped up, run /model to switch to Fable 5" — even though the account's Fable 5 weekly quota is nowhere near exhausted (see usage numbers below).

What Should Happen?

Since the account's session and weekly quotas for Fable 5 are not exhausted, /model should switch the active session to Fable 5 without redirecting to the credit top-up flow.

Error Messages/Logs

No terminal error/stack trace — the CLI silently opens the browser instead of switching models. The browser page shown is claude.ai/settings/usage, which itself displays:

"Fable 5 is still included in the Max plan. If you see a message asking you to configure usage credits, please restart Claude Code."

Account usage at time of report (from claude.ai/settings/usage):
- Current session: 0% used (resets in 4h31m)
- Weekly limit, all models: 37% used
- Weekly limit, Fable 5: 19% used
- Usage credits (separate monthly overage cap): $47.52 / $50.00 (95% used, resets Aug 1) — this is an optional overage-spending cap, not the plan's included quota

Steps to Reproduce

1. On a Max (5x) plan account with Fable 5 weekly usage at ~19% (well under the limit), run /model in Claude Code CLI.
2. Select/attempt to switch to Fable 5.
3. Observe the CLI opens the browser to the usage-credits page instead of switching the session model.

Already tried, none resolved the issue:

• Restarting Claude Code (as instructed by the in-app message)
• /logout followed by /login to refresh account/session state
• Confirming Claude Code is already on the latest version (2.1.218)
• Removing a global "model": "claude-sonnet-5" pin from ~/.claude/settings.json and starting a fresh session (ruled out as the cause — issue persisted)

Claude Model

Other

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.218 (Claude Code)

Platform

Other

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

~/.claude/settings.json has no other model-related overrides (fallbackModel, availableModels, etc. are all unset), so this isn't a local config pin — it looks like a client/server sync issue around Fable 5 eligibility or credit-gating logic, since the displayed quota numbers don't support the redirect to the credits page. Happy to attach a screenshot of the usage page and provide --debug logs if useful.