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

> Source: <https://the-decoder.com/openai-says-gpt-6-is-much-better-with-legacy-programming-languages-such-as-cobol-and-fortran/>
> Published: 2026-10-20 16:40:29+00:00

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](https://the-decoder.com/openai-says-gpt-6-is-much-better-with-legacy-programming-languages-such-as-cobol-and-fortran/) appeared first on [The Decoder](https://the-decoder.com).