Context window shows 200k instead of 1M for Opus 4.6 on Max plan

Summary

The 1M context GA blog post states that 1M context is now included by default for Max, Team, and Enterprise users with Opus 4.6 in Claude Code, with "fewer compactions and more of the conversation kept intact."

However, /context in Claude Code still reports a 200k token window.

Environment

• Claude Code: v2.1.77 (latest)
• Model: claude-opus-4-6 (default)
• Plan: Max (stripe subscription, OAuth authenticated)
• OS: Ubuntu 25.10

Steps to Reproduce

1. Start a new Claude Code session with Opus 4.6 on a Max plan
2. Run /context

Expected

claude-opus-4-6 · Xk/1000k tokens

Actual

/context output:

Context Usage
⛁ ⛀ ⛀ ⛁ ⛁ ⛀ ⛁ ⛁ ⛁ ⛁   claude-opus-4-6 · 24k/200k tokens (12%)
⛁ ⛁ ⛁ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   Estimated usage by category
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   ⛁ System prompt: 3.3k tokens (1.7%)
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   ⛁ Custom agents: 1.1k tokens (0.6%)
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   ⛁ Memory files: 5.1k tokens (2.5%)
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   ⛁ Skills: 4.5k tokens (2.3%)
⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶ ⛶   ⛁ Messages: 10.9k tokens (5.5%)
⛶ ⛶ ⛶ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝   ⛶ Free space: 142k (71.0%)
⛝ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝ ⛝   ⛝ Autocompact buffer: 33k tokens (16.5%)

/model output:

Select model
Switch between Claude models. Applies to this session and future Claude Code sessions.

❯ 1. Default (recommended) ✔  Opus 4.6 · Most capable for complex work
  2. Sonnet                   Sonnet 4.6 · Best for everyday tasks
  3. Haiku                    Haiku 4.5 · Fastest for quick answers

● High effort ← → to adjust

Attempts to Verify Context Window

There is no straightforward way to check the context window size outside of /context. We tried several approaches, none of which surfaced the information:

• claude config list — no context window or plan info exposed
• claude --version — returns version only (2.1.77), no model metadata
• claude --help — no flag for inspecting context window or account details
• ~/.claude.json — thoroughly reviewed; contains auth fields (oauthAccount, billingType: "stripe_subscription"), migration flags (opusProMigrationComplete, sonnet1m45MigrationComplete), but nothing about context window size or plan tier (Max/Pro/etc.)
• /model — shows model name and effort level, but not context window
• API model endpoint (GET /v1/models/claude-opus-4-6) — requires a separate API key; Claude Code's OAuth auth can't be reused for this
• claude -d api -p "..." — debug output doesn't surface context window metadata in responses

The only place the context window is visible is the /context command, and it currently reports 200k.

Question

Is the 1M context window expected to be reflected in Claude Code sessions now, or is this a separate rollout from the API availability announced in the blog post?