A paid Claude plan: Pro ($20 a month, or $17 a month with annual billing) or Max (from $100 a month). Team and Enterprise plans get it too once an owner enables it. The free plan isn't included in the beta.
A Google account with a doc, sheet, or deck to work on. Files need to be in Google format: Claude won't appear in Word, Excel, or PowerPoint files until you convert them.
An install from the Google Workspace Marketplace: about two minutes if your Google account allows Marketplace apps. Some workplaces block them, and only your Google admin can lift that.
Hands-on status: we checked the Marketplace listing, the first screen of the install flow, the product page, and pricing. We didn't complete the install or run the in-file steps: they need a paid Claude plan, which our test setup doesn't have. The in-file steps below come from Anthropic's Help Center guide.