Using OpenAI API in a LuaTeX document

openai_api.tex

% +++
% latex = "lualatex -shell-escape"
% max_repeat = 1
% +++
\documentclass[a4paper]{jlreq}

\usepackage[verb]{bxghost}
\usepackage{luacode}
\usepackage{luapackageloader}

% lua code
\begin{luacode*}
local HOME = os.getenv('HOME')

local LIB_PATH = HOME .. '/.luarocks/share/lua/5.4/'
local CLIB_PATH = HOME .. '/.luarocks/lib/lua/5.3/'
package.path = LIB_PATH .. '?.lua;' .. LIB_PATH .. '?/init.lua;' .. package.path
package.cpath = CLIB_PATH .. '?.so;' .. package.cpath

local openai = require 'openai'
local client = openai.new(os.getenv('OPENAI_API_KEY'), {http_provider = 'ssl.https'})

local sys_prompt = [[You are a Japanese TeX/LaTeX expert.
Return your answers as LaTeX codes, not Markdown.
You only need to produce paragraphs. You don't have to write \begin{document} or \section.
Do not include anything except LaTeX code.
Use commands \TeX{} and \LaTeX{} for TeX-related names.
Please be aware that you have to use \verb to escape TeX commands within your explanation.
Try not to produce invalid LaTeX code.
]]

local function showall(tab)
  for k, v in pairs(tab) do
    print(k, v)
  end
end

function gen_content(message)
  local status, response = client:chat({
    {role = 'system', content = sys_prompt},
    {role = 'user', content = message}
  }, {
    model = 'gpt-4o-mini',
    temperature = 0.5
  })

  if status == 200 then
    return response.choices[1].message.content
  else
    print('Request error: ' .. status)
    showall(response.error)
  end
end
\end{luacode*}

% doc body
\begin{document}

\title{すごいレポート}
\author{GPT-4o mini}
\maketitle

\section{\TeX{}と\LaTeX{}の違い}

\directlua{tex.sprint(gen_content('TeXとLaTeXの違いを説明してください'))}

\section{\TeX{}言語の楽しさ}

\directlua{tex.sprint(gen_content('TeX言語の面白さを教えてください。特に、展開制御や少ないレジスタを工夫して有効活用するテクニックに着目してください'))}

\section{本質的なこと}

\directlua{tex.sprint(gen_content('ゆきだるまがいかにかわいくて素晴らしいかを力説してください'))}

\end{document}