# Mistral AI — Modernizing complex legacy code with AI agents.

- Company: Mistral AI (mistral.ai)
- Announced: 2026-09-09T12:00:46+00:00
- Category: not stated
- Coverage: not counted
- Announcement: no
- Group: routine
- Source: https://mistral.ai/news/legacy-code-modernization/
- Record: https://forck.live/items/9599-modernizing-complex-legacy-code-with-ai-agents
- Subject: Mistral / Le Chat

Mistral AI helped a European energy operator migrate 40,000 lines of Fortran 77 to C++ for a physics-intensive reservoir simulator. The project used AI agents to understand, document, and translate the legacy codebase, and built a parity harness to verify numerical equality between the old and new code.

## Evidence

Verbatim from https://mistral.ai/news/legacy-code-modernization/:

> Mistral helped a European energy operator migrate 40,000 lines of Fortran 77 to C++, a physics-intensive reservoir simulator with no test suite and no centralized documentation.

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Record: https://forck.live/items/9599-modernizing-complex-legacy-code-with-ai-agents
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