OpenAI says its models have achieved significant improvements in COBOL code migration

Oct 26

1. 21:15

   The Verge AI

   Can AI Solve the COBOL Legacy Code Crisis?

   The Verge reviewed the progress of OpenAI and Anthropic in migrating legacy code such as COBOL, and cited several scholars pointing out that these capabilities are still far from safely replacing critical systems. OpenAI claims that GPT-6.1 Sol achieves 87% behavioral preservation accuracy at low reasoning effort, rising to 98% at higher reasoning effort, while GPT-5.6 Sol reaches only 5%. Vadim Zaytsev, an associate professor at the University of Twente in the Netherlands, said that rewriting code is not the same as replacing a system, and that AI currently does not play a major role in migrating legacy COBOL systems.

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