OpenAI says GPT-6 is much stronger on legacy languages such as COBOL and Fortran
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OpenAI says its latest models handle low-resource languages including COBOL, Fortran and Visual Basic much better. On MultiLangBench, GPT-6 Astra averages an 87.4% test pass rate across 20 languages, up from about 38% for GPT-5.6 Terra; on COBOL migration to C++, Java, Kotlin, Python or Rust, GPT-6.1 Sol reaches up to 97.9% accuracy with maximum reasoning.
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