context-windows changedbuild-with-claude/context-windows
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1414 For more on why long contexts degrade and how to engineer around it, see [Effective context engineering](https://www.anthropic.com/engineering/effective-context-engineering-for-ai-agents).
1515</Tip>
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17The following diagram illustrates the standard context window behavior for API requests1:
17The following diagram illustrates the standard context window behavior for API requests<sup>1</sup>:
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1919<Frame>
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23*1 Chat interfaces such as [claude.ai](https://claude.ai/) can also manage the context window on a rolling “first in, first out” basis.*
23*<sup>1</sup> Chat interfaces such as [claude.ai](https://claude.ai/) can also manage the context window on a rolling “first in, first out” basis.*
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2525* **Progressive token accumulation:** As the conversation advances through turns, each user message and assistant response accumulates within the context window, and previous turns are preserved completely.
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