# OpenAI announces improved COBOL building and migration capabilities

Digest AI · Research · published 2026-10-20T04:21:00Z

Canonical: https://digestai.news/story/openai-announces-improved-cobol-building-and-migration-capabilities

## Summary

On October 19, 2026 OpenAI said it has enhanced its ability to generate new COBOL programs and to migrate existing COBOL code to other languages. The company shared results from two internal benchmarks. In MultiLangBench, which tests building a SQLite engine from scratch, the average pass rate across 20 languages was 87.4% using the GPT‑6 Astra model with maximum inference settings. For COBOL migration, the GPT‑6.1 Sol model reached 86.6% accuracy with low‑inference settings and 97.9% with higher inference, measured by byte‑for‑byte output matching the original.

OpenAI emphasized that these scores do not guarantee flawless migration of whole business systems. It warned that expert review and testing against specific business rules are still required, as subtle differences in calculations can change outcomes. The announcement is framed as an evaluation of existing models rather than the launch of a COBOL‑specific AI product.

## Key points

- OpenAI reported an 87.4% pass rate on MultiLangBench for 20 languages using GPT‑6 Astra max inference.
- GPT‑6.1 Sol achieved 86.6% accuracy on low‑inference COBOL migration and 97.9% on high‑inference.
- OpenAI cautions that migration still needs expert review and may not preserve all business rules.

## Why it matters

Modernizing legacy COBOL systems could lower maintenance costs, but the need for expert validation means AI assistance is not a turnkey solution.

## Sources

1. [Breaking News OpenAI's COBOL support evolves. The 'old work rules' that AI will take over](https://note.com/dadion123/n/n419e18ebb09b?hl=en) (note.com, 2026-10-20)

Part of the developing story: [GPT-6 Professional Expansion and Reliability](https://digestai.news/thread/opinion-gpt-6-1-sol-may-be-the-best-default-model-for-codex-users) (3 stories)

## Cite

Digest AI, "OpenAI announces improved COBOL building and migration capabilities", 20 October 2026, https://digestai.news/story/openai-announces-improved-cobol-building-and-migration-capabilities

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