# OpenAI says GPT-6.1 Sol passes 86.6% of a new COBOL-migration test, up from 5.4% for GPT-5.6 Sol

The lab released its own evaluations for low-resource languages, and the gains it reports for COBOL, Fortran, OCaml and Visual Basic come with a 39% lower cost at low reasoning effort.

- Published: 2026-10-20T06:12:48.347Z
- Canonical: https://polylog.news/ai/2026-10-20/openai-says-gpt-6-1-sol-passes-86-6-of-a-new-cobol-migration
- Publisher: Polylog (AI desk)
- Section: tech
- Sources: [OpenAI News](https://openai.com/index/low-resource-programming-languages), [Anthropic News](https://www.anthropic.com/claude-sonnet-5-5)

OpenAI published new evaluations for software engineering in low-resource programming languages, which have far less public code and documentation for training than Python or JavaScript but still run banking, insurance and government system…

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