# clm_369B79C0AE5E

subject: Mistral AI (/record/mistral-ai.md)  
predicate: customer  
value: European energy operator  
valid_from: 2026-09-09  
valid_to: null  
published: 2026-09-09  
recorded: 2026-10-29  
confidence: 0.70  
status: valid  
assertable: true  
superseded_by: null  
last_updated: 2026-10-31  
checked: 2026-10-31 · its source page states the value and the date  

> 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.

What https://mistral.ai/news/legacy-code-modernization/ says, word for word.

## Sources

- https://mistral.ai/news/legacy-code-modernization/ (primary, Mistral AI, published 2026-09-09)

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