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claude-code - 💡(How to fix) Fix Max plan: Claude Code may compress context at 200K instead of using extended context window

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Plan: Max 20x Model: claude-opus-4-6 Version: 2.1.153

Claude Code triggers context compression ("Transmuting") well before what my Max plan should allow. I suspect the client tracks the context window against the model's base 200K limit and doesn't account for the extended context available on Max plans.

Evidence:

  • Session hits "100% context used" and starts compressing during moderate-length conversations
  • ~82K tokens of system prompt (startup hooks, CLAUDE.md chain, 9 MCP servers) means only ~118K remains for actual conversation before compression
  • On Max 20x, I'd expect access to the full context window, not early compression at 200K

Expected behavior: Claude Code should query the plan's actual context limit from the API and use that as the compression threshold, not a hardcoded model default.

Requested info: Does Max 20x extend the context window for Opus 4.6 beyond 200K? If yes, does Claude Code honor that?

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claude-code - 💡(How to fix) Fix Max plan: Claude Code may compress context at 200K instead of using extended context window