OpenAI upgrades its model for COBOL, Fortran, and other legacy code

The update targets decades-old languages that still run banks, governments, and large enterprises OpenAI says its latest model is now better at writing and migrating software in COBOL, Fortran, and Visual Basic. An estimated 800 billion lines of COBOL remain in production. That code powers systems at banks, government agencies, and large enterprises. OpenAI shared the update on X on October 19, 2026. The company said its newest model improvements help with building and migrating code in what it calls low-resource languages. In AI terms, “low-resource” describes a language with relatively little code for a model to learn from. OpenAI framed the work around two jobs. The first is helping teams understand business logic that was written decades ago.

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