# An AI model programmed nonstop for 19 days on a single MirrorCode task that cost $2,600 to run

> Source: <https://the-decoder.com/an-ai-model-programmed-nonstop-for-19-days-on-a-single-mirrorcode-task-that-cost-2600-to-run/>
> Published: 2026-06-26 17:24:27+00:00

Epoch AI's new MirrorCode benchmark tests whether AI models can recreate complete programs without access to the original code. Claude Opus 4.7 leads with a 56 percent solve rate, rebuilding a 16,000-line toolkit in just 14 hours. But every model tested still fails on the most complex tasks.

The article [An AI model programmed nonstop for 19 days on a single MirrorCode task that cost $2,600 to run](https://the-decoder.com/an-ai-model-programmed-nonstop-for-19-days-on-a-single-mirrorcode-task-that-cost-2600-to-run/) appeared first on [The Decoder](https://the-decoder.com).