Max plan: Claude Code may compress context at 200K instead of using extended context window
Status Fixed / completed
Reported on v2.1.153
Maintainer reply None cached
Activity 3 comments · opened May 29, 2026 · closed May 29, 2026
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?
3 Comments
Found 3 possible duplicate issues:
This issue will be automatically closed as a duplicate in 3 days.
🤖 Generated with Claude Code
Closing as duplicate of #23432 (root cause identified: context window detection function only checks for Sonnet-4, Opus always falls through to 200K). Upvoting the original.
This issue has been automatically locked since it was closed and has not had any activity for 7 days. If you're experiencing a similar issue, please file a new issue and reference this one if it's relevant.