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What is the maximum length for a system prompt?
Large language models (LLMs) rely on a system prompt to define their behavior, style, and limits. This hidden instruction guides how the model interprets inputs and produces answers. While users may see only the chat interface, the system prompt works quietly behind the scenes, shaping every response. One key question in this area is: how long can a system prompt actually be before it affects performance or gets cut off?
Written byEmily Henderson
Published onOctober 13, 2025
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