I have modified en:User:Polygnotus/Scripts/Claude6.js to use Google Gemini's free as in beer and slightly better (at text in LMArena, anyway) gemini-2.5-flash-preview-05-20 model at en:User:Cramulator/GeminiProofreader.js. There is a hyperlink to Google's API key generation page in the key entry dialog box which anyone logged in to Google even without a Google Cloud account can use to generate a free tier key. I enabled Gemini's googleSearch and urlContext tools, so presumably it should be using its "grounding" capability to search for facts and sources, and actually examining linked sources (including PDFs etc.) when prudent. I have no experience with User/common.js gadgets so I hope others will improve on this approach.