Note: This article refers to an older version of Gurobot, in its original location. As of June 2025, Gurobot has moved to the Gurobi User Portal and can be accessed here.

A few months ago, Gurobi set out to answer a simple question: Can a large language model (LLM) provide helpful answers to technical questions about building and solving mathematical optimization models with our solver?

U ntil recently, I'm sure the question would have sounded absurd—you'd probably have as much luck asking your toaster as you would asking a website. However, with the latest generation of LLMs (ChatGPT 4.0, in particular), we've been surprised to find that these systems have reached a point where they can now provide useful answers to some very sophisticated technical questions.

This surprising result inspired us to investigate further. While out-of-the-box ChatGPT could provide reasonable answers fairly often, it typically required the questions to be phrased very carefully. But by providing ChatGPT with some context up front, we saw it provided really solid answers—and quite a bit more often than when no context was given.

Seeing this difference in results inspired us to build Gurobot—a bot on top of ChatGPT that bakes in this contextual information.

A Chatbot for Optimization Modeling

To test the effectiveness of this bot in a less controlled environment, we let it loose on questions from the Gurobi Community Forum, again with surprising results.

For a substantial fraction of user questions, which are often posed with ambiguous or missing information, the bot produced responses that we thought were good enough to stand alone. We left those answers untouched, and users appeared happy with the responses.

One of the highlights of this experiment came from a user question titled, "Please correct my code." The question included 67 lines of dense Python code and a request for someone to tell the author what was wrong with it.

IImagine our surprise when we copied the code into Gurobot, hit ‘return,’ and watched as it instantly identified two issues in the code. We forwarded Gurobot’s answers to the user, who replied: “Wow. It works."

Wow, indeed!

Try It Yourself

While we have seen impressive results so far, we must include a note of caution: We have also seen situations where Gurobot hallucinates. In one recent example, Gurobot invented an entirely fictitious Gurobi API, claiming that the user could simply add calls to this non-existent API to solve their problem.

One fascinating thing about LLMs is their lack of contrition: When we told ChatGPT that its answer was incorrect, it tried to run the gurobipy code it originally proposed, acknowledged that it couldn't run it (naturally, since the API didn't exist), then formulated and tested a new response that was actually correct.

Despite these limitations, we're finding Gurobot to be useful internally for getting quick answers to questions, and for creating and running short code examples to do simple things.

Getting instant responses to optimization questions can be a huge time saver. And because this tool has proven useful for us, we've decided to make it available to everyone.

Once you’ve signed up for a ChatGPT account (free or paid), you can access Gurobot here. Please note that all data you send to it will go to OpenAI (not Gurobi).

You probably noticed that we used the word 'surprise' a lot in this post. We suspect you'll be surprised too by how often Gurobot produces helpful responses. Please give it a try and let us know what you think in our Gurobot community forum.