GPT-6 Cracks COBOL: 97.9% Migration Accuracy Shifts AI Bottleneck from Code to Enterprise

When OpenAI published benchmark results for COBOL on October 19, GPT-6.1 Sol achieved 97.9% accuracy on a byte-for-byte behavioral fidelity evaluation for COBOL migration — a 16-fold improvement over the 5.4% its predecessor managed at the same test. That figure represents a genuine capability threshold crossing: the AI technical barrier to accurate COBOL translation has moved meaningfully. What hasn't moved are the copybooks, the JCL job streams, the undocumented business logic, and the organizational complexity that make real enterprise migration hard — none of which that benchmark measures. The distinction matters because an estimated 250 billion lines of COBOL remain in active production globally.