I tested all available versions of ChatGPT to see which model writes the best work emails

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• OpenAI unveiled GPT-4o, its latest generative AI model, on Monday.
• GPT-4o is available as a text-based chatbot on ChatGPT.
• Business Insider tested GPT-4o's email-writing capabilities and compared it to older models.

OpenAI's newest model, GPT-4o, is predicted to shake up multiple industries, but its email writing skills might need some work.

During a flashy display Monday...