Claude Code's context window size varies significantly depending on the model and configuration, with most versions offering 200,000 tokens and newer models like Sonnet 5 and Opus 4.7 supporting up to 1,000,000 tokens. However, the effective usable context is reduced by system prompts, memory, and skill descriptions, which can consume a substantial portion of the window before user input. Anthropic acknowledges that larger context windows do not always equate to better performance, citing a phenomenon called "context rot" where accuracy degrades as token count increases, emphasizing the importance of curating content within the window. AI
IMPACT Understanding context window limitations and overhead is crucial for optimizing LLM performance and cost-effectiveness.
RANK_REASON The item discusses a specific product's configuration and features, not a new model release or significant industry event.
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