Unverified50% confidenceFactExact time
Claude Code ships with built-in system instructions and tool definitions at startup, consuming over 20,000 tokens before the user inputs anything, and these are carried with every message
1
Sources
50%
Confidence
Medium-term (~90 days)
Relevance
10/6/2026
First Seen
Valid until: 1/4/2027
Sources
Related Entities
Related Claims
UnverifiedAnthropic's official Claude Code sends up to 33,000 tokens of preamble content before processing user input.72% similarUnverifiedFrameworks such as Claude Code, Open Code, Cline, and Cursor add an additional 8,000 to 30,000 tokens of system prompt to each message sent to the model.71% similarUnverifiedClaude Code拥有20万Token的上下文窗口71% similar
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