Claude Models10 min read
Claude Context Window Explained: 200K vs 1M Tokens
Claude's context window is its working memory: 1M tokens on Opus 4.8 and Sonnet 5, 200K on Haiku 4.5. What happens when it fills up, and how to manage it.
Claude's context window is its working memory: 1M tokens on Opus 4.8 and Sonnet 5, 200K on Haiku 4.5. What happens when it fills up, and how to manage it.
Claude Code auto compact summarizes your session when context runs low. Learn what survives, how to read the indicator, and how to control or disable it.