 The new race was initially titled the Prix Henri Foy, and from this point the Prix de Chantilly was contested over 2,400 metres.The race was cut to 2,000 metres in 1960, and restored to 2,400 metres the following year.It was switched to Chantilly in 1964, and returned to Longchamp with a length of 2,100 metres in 1966.