[BUG] Fable 5 unavailability banner suggests "Opus 4.8" but `/model opus 4.8` returns "not found" (v2.1.98)

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?

When launching Claude Code v2.1.98, a banner is displayed due to the Fable 5 suspension:

Claude Fable 5 is currently unavailable. Please use Opus 4.8 or another available model. Learn more: https://www.anthropic.com/news/fable-mythos-access

However, running /model opus 4.8 returns:

Model 'opus 4.8' not found

The banner recommends a model that the /model command cannot select. The session starts on Opus 4.6, which works fine — but users are left confused by a banner pointing them to a model they can't switch to.

What Should Happen?

Either:

1. /model opus 4.8 should resolve correctly to the Opus 4.8 model, or
2. The banner should reference a model name that the /model command actually accepts (e.g., the correct identifier for Opus 4.8)

Steps to Reproduce

1. Launch claude --dangerously-skip-permissions (or just claude) on v2.1.98
2. Observe the Fable 5 unavailability banner suggesting "Opus 4.8"
3. Run /model opus 4.8
4. Observe: Model 'opus 4.8' not found

Screenshot

!screenshot

(CLI screenshot showing the banner and the model not-found error)

Claude Model

Opus

Is this a regression?

I don't know

Claude Code Version

2.1.98

Platform

Anthropic API

Operating System

Other Linux (openSUSE, kernel 7.0.12-1-default)

Terminal/Shell

Bash