Switching from OPL

AMPL is a great alternative to OPL, whether you are just starting out or are looking to switch away from OPL. This page overviews why migrating from OPL™ and CPLEX™ to AMPL™ and Gurobi is both useful and likely easier than you think.

For existing OPL users, there are key reasons to consider converting to AMPL. OPL was inspired by AMPL and is based largely on the same concepts, which makes migration easier than one might expect. The fundamental thinking about the model, and therefore how it is structured, is similar across both languages. People choosing between AMPL and OPL for a new model will generally find it easier to get up and running with AMPL, and find the process of building a model is more streamlined with AMPL than with OPL. In addition, AMPL offers a comprehensive book, available for free online, that provides a complete tutorial introduction to the language’s many features. Below is a summary of some key comparisons between AMPL and OPL. We are of course happy to talk about your unique situation and answer any questions you may have.

  • With AMPL, new projects get up and running faster and easier. AMPL has a more streamlined design than OPL, and much more extensive tutorial material (in the comprehensive AMPL book).
  • AMPL has a more truly interactive interface than OPL, facilitating development and testing. Any AMPL statement can be executed interactively from the command line, providing greater flexibility than OPL in troubleshooting modeling issues.
  • AMPL’s scripting language is integrated with its modeling language, simplifying the transition from formulation to application development and testing. When the model is built, it is easy to use intuitive scripts to read, calculate, and write data, as well as output tables. This contrasts with OPL’s use of an entirely separate scripting language based on JavaScript.
  • AMPL is an independent modeling system that does not lock the user into IBM’s solver offerings. This allows you to choose the industry’s arguably best solver, Gurobi, and still get the benefits you want from a modeling language. In addition to its support for Gurobi, AMPL offers full support for general-purpose nonlinear solvers that have no counterparts among IBM’s products.
  • AMPL focuses on optimization modeling and leaves other aspects of development to whatever tools a user is already familiar with. By contrast, OPL is part of a complex proprietary development system (ODM) that requires a much greater degree of specialized expertise.


Like Gurobi, AMPL is focused on doing one thing really well. As a result, when you choose Gurobi and AMPL you know you are getting one of the best modeling/solver combinations available today, with a strong history of ongoing improvements and great support. Just as importantly, this single-minded focus helps ensure that today’s smart choice is also the right long-term choice. Please fill out the below form to arrange a free evaluation of Gurobi and AMPL.

You may also be interested in learning about our Gurobi Python modeling and development environment. The Gurobi Python Environment combines the benefits of a modeling language with the strengths of a programming language. By embedding our set of high-level optimization modeling constructs in the very popular Python programming language, we’ve eliminated the need to choose between working in just a modeling language or just a programming language.

Commercial License

Commercial Users: Gurobi allows you to try a free, full-featured, commercial evaluation license for 30 days. During that time, you’ll also get:

  • Free benchmarking services
  • Free model tuning services
  • Access to Gurobi’s world-class technical support
  • Two free hours of one-on-one consulting services

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Note to Academic Users: Academic users at recognized degree-granting institutions should get a free academic license instead and not a commercial evaluation license.

Evaluation licenses are reserved for our commercial users who first want to verify it fits with their needs.

Students, teachers and researchers can quickly secure a free academic license.

You can get your free license and learn about our academic program here.

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