https://chatgpt.com/apps/spreadsheets/
Article
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OpenAI launched ChatGPT integration directly inside Microsoft Excel
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Powered by GPT-5.4, available as an Excel add-in
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Workbook content may be shared with OpenAI per marketplace terms
Discussion
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OpenAI engineer confirmed launch in thread, invited feedback
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Commenters say Copilot is so bad OpenAI fills the gap; Microsoft threatened
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Privacy concerns flagged: content shared with OpenAI by default
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One commenter notes M365 Copilot now defaults to Claude Sonnet 4
Discuss on HN