[BUG] /model opus (bare alias) resolves to 1M context instead of 200K (v2.1.157 / v2.1.158)

Summary

On the Claude Team plan, the bare opus model alias resolves to a 1M-token context window instead of the standard 200K. The 1M window should only be selected by the explicit opus[1m] alias.

Steps to reproduce

1. Claude Code v2.1.157 or v2.1.158, Claude Team plan
2. Run /model opus ← bare alias, not opus[1m]

• ~/.claude/settings.json now contains "model": "opus"

1. Run /context

• It reports 24.4k/1m tokens — a 1M window — for "Opus 4.8 / claude-opus-4-8"

Expected

• /model opus → Opus 4.8 with the standard 200K context window
• /model opus[1m] → Opus 4.8 with the 1M context window

The whole point of having two separate aliases (opus vs opus[1m]) is that the bare form is 200K and the [1m] suffix opts into 1M. If bare opus already maps to 1M:

• the [1m] suffix is meaningless, and
• there is no alias to select the 200K Opus window at all — you'd have to fall back to the full model id claude-opus-4-8.

Notes

• /model sonnet correctly reports a 200K window, so this auto-upgrade is specific to opus.
• If 1M-by-default on Team/Max/Enterprise is intended behavior, then (a) it contradicts the existence of the separate opus[1m] alias, and (b) there needs to be a documented bare-alias way to select 200K. As shipped, the alias set is inconsistent.

Affected versions

• 2.1.157
• 2.1.158

Environment

• OS: macOS
• Plan: Claude Team