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A token is not a word; it is the smallest billable unit of machine cognition, and every prompt runs a meter.
Language models break text into sub-word pieces and process them as sequences of integers, so a common word may be one token while an unusual name splits into several. Providers price usage per token, typically with separate rates for input and output. Once cognition is counted this way, it can be budgeted, audited, and optimized like any other metered input.






