Claude Sonnet 4.5 autonomously generates Slack clone in one shot in 30 hours (theverge.com)

Does anyone know if they published the prompts they used for this test? Would be great to read and learn from.

"Anthropic’s latest AI model spent 30 hours running by itself to code a chat app akin to Slack or Teams. It spat out about 11,000 lines of code, according to Anthropic, and it only stopped running when it had completed the task."

Great, where's the code?