Sebastian Pokutta's Blog

Mathematics and related topics

CPLEX free for academic use

with 6 comments

Probably I am not the first one to report this but CPLEX is now available for free for academics as part of IBM’s academic initiative (see here):

Full-version CPLEX now available free-of-charge to academics

Posted: Feb 18, 2010 08:30:03 PM

Effective February 15, 2010, IBM is offering no-charge full-version ILOG Optimization products via IBM’s Academic Initiative program ( This move builds on the availability of limited Teaching Editions available since August 2009, and now provides registered members with renewable one-year access to IBM ILOG OPL-CPLEX, CPLEX, CP Optimizer and CP for both teaching and research use. Registered members can access ILOG Optimization software at:, where they can search for ILOG Optimization or individual solvers by name. Depending on the search criteria, electronic assemblies will be retrieved for IBM ILOG OPL Development Studio, CPLEX, CP Optimizer or CP on all commercially available platforms. To run the software, members will also need to download a key from:, but are no longer required to install ILM. Note that as part of Academic Initiative, IBM also makes its professionally-developed training materials available for use in classrooms and labs at:

The application is pretty forward and the verification of eligibility is supposed to take “3-5 business days”. But it seems that the accounts are approved much faster (at least in my case).


Written by Sebastian

February 22, 2010 at 2:21 pm

6 Responses

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  1. Hi nice blog,
    has anyone implemented a cut/lazy constraint that requieres a separation routine in cplex using callbacks?

    In particular i’m implementing the traveling salesman problem with subtour constraints, i’ve managed to implement the cut and add the first cut to cplex, but i can’t get to reoptimize the node to add a different inequality.
    If it’s anyone interested in learning this feature i can submit the code


    Javier Zambrano

    May 28, 2010 at 4:10 am

  2. hello.I want to download the CPLEX free for academic use.please help me.thanks.


    August 24, 2010 at 2:44 pm

    • Hey, you can download it directly at IBM. First register with the academic initiative program and then you can download from the product section.


      August 25, 2010 at 2:18 pm

  3. how hard is to install Cplex ? Can it run on off-the-shelf computer or is it preferably installed on some powerful application servers?


    March 30, 2011 at 4:32 pm

    • It is not too hard. On the unix systems everything is precompiled and you just need to copy it to an appropriate destination and set a few environment variables.


      March 31, 2011 at 8:26 am

  4. Hi!
    I am trying to solve a double-objective (P-median/P-center) LP problem with CPLEX. The problem is that CPLEX can fill the gap only at 21% and gives an out-of-memory (1001) error message. I am aware that there may be a way to feed the 21% gap-filling solution again into CPLEX to further and finalize the processing. But I don’t know how to that. Can somebody here help on this?
    I am also interested in knowing how to optimize the computer memory so that the processing does not use too much of the available memory space which ultimately results in that out-of-memory message displaying and which also interferes with the whole processing stuff.

    Thanks in advance.

    Zabelbok Berachat

    July 10, 2012 at 7:40 pm

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