GoKawiilOpenAI reports major gains in legacy code migration with GPT-6.1 Sol and GPT-6 Astra
OpenAI says its newer models show large improvements writing and migrating code in older languages like COBOL, Fortran and Visual Basic. Using its new MultiLangBench test, GPT-6 Astra scored an average 87.4% pass rate versus 26.8% for GPT-5.6 Sol, with COBOL jumping from 10.9% to 72.1%. Separately, GPT-6.1 Sol reportedly reached 86.6% accuracy migrating COBOL to modern languages at low reasoning effort, rising to 97.9% at higher effort.