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OpenAI says GPT-6 is much better with legacy programming languages such as COBOL and Fortran

OpenAI's GPT-6 Astra achieved an 87.4 percent test pass rate across 20 languages on the new MultiLangBench, up from about 38 percent for GPT-5.6 Terra, as OpenAI improved its latest models for low-resource programming languages including COBOL, Fortran, and Visual Basic. For COBOL migration specifically, GPT-6.1 Sol reaches up to 97.9 percent accuracy, a result OpenAI says could matter for modernizing critical financial infrastructure.

by read1 min views1 publishedOct 20, 2026

OpenAI improved its latest models for low-resource programming languages like COBOL, Fortran, and Visual Basic. On the new MultiLangBench, GPT-6 Astra hits an 87.4 percent test pass rate across 20 languages, up from about 38 percent for GPT-5.6 Terra. For COBOL migration specifically, GPT-6.1 Sol reaches up to 97.9 percent accuracy, a result that could matter for modernizing critical financial infrastructure.

The article OpenAI says GPT-6 is much better with legacy programming languages such as COBOL and Fortran appeared first on The Decoder.

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