Tuesday, January 16, 2024

Informs Test of Time Award for CONOPT paper

The Test of Time Award for papers published in the INFORMS Journal on Computing in the years 1993–1997 is awarded to

CONOPT: A Large-Scale GRG Code

Arne Stolbjerg Drud

ORSA Journal on Computing 6(2):207–216, 1994 

As Arne notes in [1], he is helped a bit by the fact that CONOPT users may want to cite a published paper (and because there is no newer successor paper). Still, this is quite an achievement. 

My impression is that large-scale non-linear programming is a little bit under the radar compared to the large number of papers published on linear and mixed-integer programming. Furthermore, CONOPT is a bit under the radar compared to famous academic large-scale NLP solvers such as MINOS and IPOPT. This is opposed to practical use, where CONOPT plays a very important role. It is usually my go-to NLP solver.


  1. Alice E. Smith, Note from the editor, INFORMS Journal on Computing, January 2024, https://pubsonline.informs.org/doi/10.1287/ijoc.2024.ed.v36.n1
  2. Arne Stolbjerg Drud, CONOPT: A Large-Scale GRG Code, ORSA Journal on Computing, 1994, https://pubsonline.informs.org/doi/abs/10.1287/ijoc.6.2.207 

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