2006
First Prize in the 2006 HPC Challenge Class 2 award at SC|06, in which the Cilk entry was cited as "Best Combination of Elegance and Performance."
2005
Finalist in the 2005 HPC Challenge Class 2 award at SC|05.
1999
Gold Award for the 1999 CrayQuest competition organized by the Singapore Institute of High Performance Computing and Silicon Graphics, Inc., awarded to a team from Nanyang Technological University in Singapore for their entry written in Cilk.
George M. Sprowls Award for outstanding doctoral research contributions in computer science awarded to Matteo Frigo by the MIT Electrical Engineering and Computer Science Department for his Ph.D. thesis, Portable High-Performance Programs.
1998
First Prize in the 1998 International Conference on Functional Programming's Programming Contest, in which Cilk was cited as "the superior programming tool of choice for discriminating hackers."
William A. Martin Thesis Award awarded to Andrew F. Stark by the MIT Electrical Engineering and Computer Science Department for his Master's thesis, Debugging Multithreaded Programs that Incorporate User-Level Locking.
1997
Second Place in the 1997 Dutch Open Computer Chess Championship for Cilkchess, a chess-playing program written in Cilk.
1996
First Place in the 1996 Dutch Open Computer Chess Championship for Cilkchess, a chess-playing program written in Cilk.
1995
Second Place in the 1995 International Computer Chess Association's Eighth Computer Chess World Championship for ⋆Socrates 2.0, a chess-playing program written in Cilk.
1994
Third Place in the 1994 ACM International Computer Chess Championship for ⋆Socrates, a chess-playing program written in Cilk.