OpenAI says its newest model now gets COBOL migrations right 86.6% of the time

OpenAI says GPT-6.1 Sol correctly migrated COBOL programs to languages such as Java or Python without changing their behavior 86.6% of the time at a low reasoning setting, up from 5.4% for GPT-5.6 Sol, and 97.9% with more reasoning. The tests are OpenAI's own. BleepingComputer notes that real migrations would still need expert review and testing.

Photo: Markus Spiske markusspiske / Wikimedia Commons, CC0 (cropped)

Sources

• News report BleepingComputer (2026-10-20)
  OpenAI says GPT-6.1 Sol is dramatically better at migrating legacy code

Editorial policy ・ Terms of use