OpenAI
@OpenAIOct 19
Our latest model advances bring stronger capabilities for building and migrating software in low-resource programming languages such as COBOL, Fortran, and Visual Basic. These languages power software that banks, governments, and businesses depend on. Progress here means understanding decades of business logic and helping developers modernize those systems while preserving what works. We’re building these capabilities around the challenges developers and enterprise customers bring us. If your team is working on these systems, tell us which languages and workflows we should tackle next. openai.com/index/low-resourc…

Oct 19, 2026 · 10:30 PM UTC

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Banks and governments still run on COBOL and Fortran. Help migrating that code is quiet work, and it could matter more than a lot of flashier launches.
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cant wait for my bank to run on vibe coded cobol. moving my savings under the mattress tonight lmao
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Each new model performs worse and worse.
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With COBOL the code is often the easy half. A lot of the business logic sits in the JCL, copybooks and batch schedules around it. Would like to see it work through a whole job chain, not just single programs.
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@OpenAI
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COBOL devs about to be the highest paid people on earth lol
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the 6 stages of the last COBOL dev reading this
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Open source your deprecated models xitter.cf/i/trending/21116647285…

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Tendría que encontrar mis viejas apps Visual Basic y hacer el experimento. Aun exhumar esos proyectos, me da miedo carmico xD
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somewhere a 60-year-old COBOL programmer just felt a disturbance in the force
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Finally, the bank's last COBOL guy can retire.
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I'd rather see you fix the Markdown rendering bugs first, even if they're caused by a third-party library. / まずはMarkdownレンダリングバグに対応してもらいたいかな。よそのライブラリが原因だとしても。
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LonelySloth
@lonelysloth_secOct 20
The code hasnt been migrated bc it works and failure is very costly. We could have automated translation to Java decades ago if it made sense. Most companies with large Cobol code bases have also already spent countless millions trying to create replacement systems that never went into production. Making converting to other languages cheap doesn’t solve any of it.
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Hahaha these were the ones (COBOL, Fortran, Visual Basic) which I used way back at Engineering School …
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COBOL, Fortran, and Visual Basic all have banked resets — do you?
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COBOL or any other of those languages have never been the issue, it's 40 years of undocumented business rules, and the one guy who knew why a field goes negative some days retired in 2009 LOL
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I don’t think even AI models want to touch COBOL code 😭
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I'm surprised these languages weren't part of previous model training.
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Were they migrating too? North or South?
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cobol devs finally get to retire, they were promised that in 1999
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Haha nice xitter.cf/tanujprakash37/status/…
Tanuj Prakash
@tanujprakash37Oct 21
OpenAI says GPT-6.1 Sol can now rewrite COBOL. Finally, a coder under 60 who can read it.
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"COBOL supports⁠ more than 40% of online banking systems... while Fortran is used in weather forecasting and nuclear reactor safety analysis⁠." While visual basic supports more than 850 million spreadsheets that only one person in the office understands
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My first job out of uni was converting IBM RPG II code. 100 indicators and no documentation. I’d love to turn Astra loose on that old codebase.
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Sidebar: Next you need old JAVA portlets -> spring
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Ocaml? 👀😅
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what about ADA
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Banks have been running on code that only three retired gentlemen still understand. Nice to know there'll finally be a fourth!
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It will just rewrite legacy code and make it completely flexible so people can finally get these apps working the way they want.
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beto
@betobarba_Oct 19
cobol devs spent 40 years being irreplaceable. they almost made it
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Add mojo in please :)
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Danny Reeves
@dannyintheloopOct 20
Brilliant. Somewhere in a building society basement, a man called Keith can finally book his retirement do.
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They’re really coming after everything aren’t they. Even niches won’t survive.
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Modernizing those systems means building infrastructure (hardware) that has the same uptime. It's not just the legacy code and buried business rules. Take a look at the reliability of AS/400's sometime.
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银行和政府的核心系统很多还跑在 COBOL 上，懂这门老语言的人越来越少，AI 来做"老代码迁移"可能是最实在的落地场景之一。想问：迁移后怎么证明新系统的行为和老系统完全一致？ Curious how migrations get verified as behaviorally identical to the legacy system.
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What about visual foxpro? Can you test that?
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