In four days of climb, between the 6 and 10 August 1964, Bonatti climbed for the first time the Pointe Whymper (one of the six summits of the Grandes Jorasses) together with Michel Vaucher. The climb (known today as the Bonatti-Vaucher route) is still considered very technical and difficult. It is classified as ED alpine grade and consists of of rock-climbing rated UIAA VI, several sections of mixed ground quoted M6 (vertical to overhanging with difficult dry tooling) and with some pitches of A2 aid climbing. This difficult climb would be repeated in winter in 1976 by Pierre Béghin and Xavier Fargeas. In 1977 Pierre Béghin would solo the route in winter.