Submitter here. It's using gpt-4 and saving the model that OpenAI returns, which helps us see the specific model that is used each time.

    "Env": [
        "VIRTUAL_HOST=gpt-unicorn.adamkdean.co.uk",
        "LETSENCRYPT_HOST=gpt-unicorn.adamkdean.co.uk",
        "HTTP_PORT=8000",
        "STORAGE_PATH=/data",
        "OPENAI_API_KEY=sk-**SNIP**",
        "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
        "NODE_VERSION=16.17.1",
        "YARN_VERSION=1.22.19"
    ],

I’m not saying they do, just that you can’t know from the code alone.