Regression: Opus 1M context now shows 'Billed as extra usage' on Max plan — was correctly showing 'included' until March 27

Bug description

This is a regression, not a new bug.

Until March 27, 2026, the /model selector in Claude Code correctly showed that Opus 4.6 (1M context) was included in the Max plan — no extra usage. Since March 27-28, it now shows:

4. Opus (1M context)    Opus 4.6 with 1M context · Billed as extra usage · $5/$25 per Mtok

This contradicts Anthropic's own official communication.

Proof: Official Anthropic email (March 20, 2026)

On March 20, 2026, the Claude Team sent an email to Max subscribers (from no-reply@email.claude.com, subject: "New: Claude Code channels, scheduled tasks, and more") that explicitly states:

"1M context is now included in Max, Team, and Enterprise plans — no extra usage required. Select it with /model to get longer sessions, fewer compactions, and more room for context that matters."

Blog post confirming the same: https://claude.com/blog/1m-context-ga

Timeline

| Date | Behavior |
|------|----------|
| March 13 | Anthropic announces 1M context included in Max plans (blog post) |
| March 20 | Official email to subscribers confirming "no extra usage required" |
| March ~27 | /model selector silently reverts to showing "Billed as extra usage · $5/$25 per Mtok" |

The problem

Changing billing terms without notifying customers is a serious issue. Users subscribed to Max plans (up to $200/mo) based on communicated features. Silently reverting the 1M context inclusion — or even just displaying incorrect billing info — erodes trust.

If the pricing actually changed: customers should have been notified before the change, not discover it in the model selector.

If the pricing didn't change and this is a display bug: it needs to be fixed urgently, as it's causing users to avoid 1M context thinking they'll be charged extra.

Related

• #34790 (closed as duplicate) — same display issue, reported right after the March 13 announcement
• #40222 — related display bug ("Claude API" shown instead of plan name)

Environment

• Claude Code v2.1.86
• macOS Darwin 25.4.0
• Plan: Pro Max (X20)

Screenshot

The /model selector currently shows:

1. Default (recommended)    Sonnet 4.6 · Best for everyday tasks
2. Sonnet (1M context)      Sonnet 4.6 with 1M context · Billed as extra usage · $3/$15 per Mtok
3. Opus ✔                   Opus 4.6 · Most capable for complex work
4. Opus (1M context)        Opus 4.6 with 1M context · Billed as extra usage · $5/$25 per Mtok
5. Haiku                    Haiku 4.5 · Fastest for quick answers

Options 2 and 4 should NOT show "Billed as extra usage" for Max/Team/Enterprise subscribers.