$ man context-windows

Context Windows

The amount of text an AI model can see and remember in a single conversation.

Larger context = more files, more history, more continuity. Claude Sonnet 4.5 has 200k tokens. That's roughly 150k words. Big enough to load your entire voice system, recent conversation history, and current task context without forgetting.

The agent auto-manages context. You don't. But knowing the limit exists helps you understand why agents sometimes lose track of earlier instructions. If you hit the limit, the agent summarizes and refreshes.