Kimi AI's Word Doc Editor - How Good Is It?

Moonshot AI just shipped Kimi Docx — an AI agent that can write, comment on and export Word files straight from a chat window, powered by their K2.5 model. If you've seen the buzz and wondered what it actually is: Kimi Docx spins up a fresh agent every time you upload a .docx, reasons about its structure, and hands back an edited file.

Because editGPT tackles the same Word-editing problem from a different angle, we gave both tools the same batch of documents — technical specs, legal contracts, marketing brochures — to see where each one shines.

The first surprise was formatting. editGPT preserved footnotes, multi-column tables and fenced code blocks without blinking. Kimi handled simple prose but stumbled on complex layouts: in a 60-page safety manual it duplicated one table, stripped another and even inserted a stray Python traceback mid-paragraph while “repairing” the file.

Track Changes told a similar story. editGPT wrote genuine Word revisions you can accept or reject. Kimi produced a plain-text diff, so changes still had to be applied by hand.

Speed and scale favoured different ends of the workflow. editGPT finished its proof-read of that safety manual in under ten seconds and accepts manuscripts up to two-hundred thousand words. Kimi took about forty-five seconds for the same file and, by Moonshot’s own guidance, feels most comfortable near the ten-thousand-word mark.

Pricing is the final wrinkle. editGPT sells clear word quotas—three-hundred thousand words a month for ten dollars, five million for twenty-five—while Kimi charges per token, a metric that fluctuates with every character, making long projects harder to budget.

After a week of testing the pattern emerged: Kimi spawns a fresh agent each time, reasoning from scratch about the structure of every file. That is brilliant for generating a brand-new report with charts and translations, but it still struggles to respect an existing, carefully laid-out draft. editGPT takes the opposite view—assume the document is precious, change only the prose, and never touch the scaffolding.

Practical takeaway: let Kimi sketch the first version if you need rapid content creation, then open the exported .docx in editGPT for the heavy-duty copy-editing that keeps code snippets, equations and legal clauses exactly where the author left them.

Sources: Moonshot AI feature announcement (30 Jan 2026); K2.5 technical report; editGPT pricing sheet; internal performance logs.