It's a spelling error.
People often make this error because "peak" and "peek" are homophones; they sound the same but have different meanings. "Peak" refers to the top or highest point of something, like a mountain, while "peek" means to take a quick glance or look. In the context of a "sneak peek," the intended meaning is a quick preview or glimpse, not the top of something.
The correct phrase is "sneak peek".
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