Word cloud based on frequencies in instance descriptions In response to the needs of researchers for access to real-world mixed integer programs, Robert E. Bixby, E.A. Boyd, and R.R. Indovina created in 1992 the MIPLIB, an electronically available library of both pure and mixed integer programs. Since its introduction, MIPLIB has become a standard test set used to compare the performance of mixed integer optimizers. Its availability has provided an important stimulus for researchers in this very active area. The library has now been released in its sixth edition as a collaborative effort between Arizona State University, COIN-OR, CPLEX, FICO, Gurobi, MathWorks, MIPCL, MOSEK, NUOPT, SAS, and Zuse Institute Berlin. Like the previous MIPLIB 2010, two main sets have been compiled from the submissions. The Benchmark Set contains 240 instances that are solvable by (the union of) today’s codes. For practical reasons, the benchmark instances were selected subject to various constraints regarding solvability and numerical stability. The much larger Collection Set represents a diverse selection regardless of the above, benchmark-relevant criteria. Download the instance sets as well as supplementary data, run scripts and the solution checker from our Download page.

Contact Us

The current maintainers of the website and its content are Ambros Gleixner and Gregor Hendel. Contributions of new solutions to open instances are always welcome, and will be made available in periodic updates of the web page. Also, we are happy to provide additional instance sets that are different from the ones available.


This page now hosts the new MIPLIB 2017. Find its predecessor MIPLIB 2010 on our Links page.

News & Status


Nov 30, 2018 Release of version 3 of the Solution file as well as updates to different subsets after 9 additional instances have been solved, and 8 others have been updated.
Nov 09, 2018 Release of versions 2 of the hard, open, and infeasible sets as well as the Solution file after 6 previously open instances have been solved.
Nov 05, 2018 Release of MIPLIB 2017, the 6th edition of the Mixed Integer Programming library.
Aug 2017 Start of performance evaluation on submissions.
Apr 2017 Submission deadline for the new library.

For all news, click here, or view the complete Changelog.


Frequencies of categories easy/hard/open

Frequencies of categories easy/hard/open

‘Easy’ means that the instance could be solved within less than one hour using an out-of-the-box solver on standard desktop computing hardware, ‘hard’ stands for instances, that have been solved in longer runs possibly using nonstandard hardware and/or algorithms, whereas ‘open’ means, that the instance has not yet been reported solved.


A journal article about the selection process of MIPLIB 2017 is currently under preparation. Until it is finished, please cite this webpage.

  Title                    ={{MIPLIB} 2017},
  Note                     ={http://miplib.zib.de},
  Year                     ={2018},
  Key                      ={miplib2017}


Most of the data files on this site have been converted, some optimal solutions are gathered from papers and some data was typed in by hand or generated by automatic solution extraction programs. While we took every effort to make no mistakes, we cannot guarantee that everything is correct. If you find any errors or have doubts about a solution, please contact us.

Last Update Nov 30, 2018 by Gregor Hendel
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© 2018 by Konrad-Zuse-Zentrum für Informationstechnik Berlin (ZIB)