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September 9, 2026 By Mistral Back to Blog 7 min read Share this post Copy url to clipboard Copied Thinking Summary Mistral helped a European energy operator migrate 40,000 lines of Fortran 77 to C++. Learn how it was done, and the lessons to carry forward. Legacy scientific codebases accumulate over decades, and when original authors leave, the knowledge embedded in the code becomes hard to recover. Moreover, using languages with no active developer ecosystem means missing out on the opportunity to build on top of others’ work. 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. Moving beyond code translation in legacy code modernization. Translating syntax from one language to another is a largely solved task. Asking any recent model to translate a snippet from a non-completely-obscure language to another, will likely converge to an acceptable outcome in few iterations. However, migrating a full system from a procedural language to..."},"evidence_pages":[],"related_signals":[{"id":"4854b428-8ca4-4c89-9dca-bd562416546f","url":"https://onlylabs.fyi/signals/4854b428-8ca4-4c89-9dca-bd562416546f","source_url":"https://mistral.ai/news/mistral-makes-sovereign-open-weight-ai-to-frontier/","title":"Mistral raises €3B to make sovereign, open-weight AI the technology frontier","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"mistral","name":"Mistral AI","category":"frontier-lab"},"occurred_at":"2026-09-08T12:00:22+00:00","first_seen_at":"2026-09-08T08:00:50.815996+00:00","date_source":"rss.item_date"},{"id":"4d3ed752-e1f9-473c-8a47-c3021d5be2bb","url":"https://onlylabs.fyi/signals/4d3ed752-e1f9-473c-8a47-c3021d5be2bb","source_url":"https://mistral.ai/news/mistral-x-humain/","title":"Mistral x HUMAIN ","context":null,"kind":{"key":"post_published","label":"Writing"},"org":{"slug":"mistral","name":"Mistral AI","category":"frontier-lab"},"occurred_at":"2026-08-24T16:02:41+00:00","first_seen_at":"2026-08-24T20:00:52.882423+00:00","date_source":"rss.item_date"},{"id":"bebc92e0-4bec-4b85-9223-443bd931243b","url":"https://onlylabs.fyi/signals/bebc92e0-4bec-4b85-9223-443bd931243b","source_url":"https://mistral.ai/news/agentic-search/","title":"Agentic Search. 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