Source
Modernizing complex legacy code with AI agents.
Mistral helped a European energy operator migrate 40,000 lines of legacy Fortran 77 code to C++. The project focused on using AI agents to modernize a physics-intensive reservoir simulator while ensuring numerical accuracy.
Why it matters
This allows companies with outdated, undocumented software to update to modern languages. This process makes it easier to hire new developers and integrate with current computing frameworks that do not support obsolete languages.
The big picture
This demonstrates a practical application of AI agents for legacy migration, complementing prior coverage of enterprise agentic workflows and the use of Fortran in systems like CEA v3.
The details
The team replaced Fortran 77's COMMON blocks (global memory) with C++ object-oriented structures and integrated the PetSc scientific computing framework. The project began by using AI agents and OCR to reconcile documentation from old PDFs. In the first sprint, 40,000 of the total 300,000 lines of code were migrated using a workflow consisting of a planner, coder, tester, and human reviewer.
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