Gemini’s app offers 4 Argon to paid subscribers, while developers should prepare for December changes to two Gemini 2.5 API models.

Gemini app: On October 13, Google began rolling out Gemini 4 Argon globally to AI Pro and Ultra subscribers. The app also offers reusable skills and a Customize hub for connected apps; most connected apps are available in English in the U.S. On October 29, Google said all users could create, preview and edit files in Gemini: PDFs on web and mobile, and other supported formats on the web. Release notes · File editing

Developer API: Gemini 4 Argon is generally available as gemini-4-argon. Google deprecated gemini-2.5-pro and gemini-2.5-flash on November 2. From December 1, requests will automatically route to gemini-3.8-flash and gemini-3.5-flash-lite, respectively, at the replacement models’ rates. Developers should migrate and review breaking changes, including function calling, thought signatures and thinking configuration. API release notes

Google announced Gemini 4 Carbon on October 28, but initial access is limited to selected cyber defenders; broader app and developer availability is still to come. Announcement