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Compaction is triggered at 50% with GPT-5.6 Luna Max #4571

Description

@hutstep

Describe the bug

When using Copilot CLI with GPT-5.6 Luna Max (maybe other effort levels also), compaction is triggered at 50%. Implementing even smaller tasks almost always trigger compaction because of that.

Affected version

GitHub Copilot CLI 1.0.80

Steps to reproduce the behavior

Use Copilot CLI with GPT-5.6 Luna Max let it work on a task. At 50% context window, compaction triggers.

Expected behavior

Should happen at approximately 80% of the context window's capacity.

https://docs.github.com/en/copilot/concepts/agents/copilot-cli/context-management#when-compaction-happens

Additional context

  • MacBook Pro - M2 Pro

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