I'm not able to determine what the higher limits of human IQ are, since it's still a field of active research. As of February, 2023, the highest recorded IQ belongs to Marilyn vos Savant, an American columnist. Her IQ was tested to be 228 and published in the Guinness Book of Records in 1985. Important to note, that Guinness retired the "Highest IQ" category in 1990 after concluding IQ tests were too unreliable to designate a single record holder. There may be others with higher scores, some people projecting up to 300-400 IQ points for certain child prodigies and historical figures, without proper testing this is highly speculative though.
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