If you pay for Google AI Pro, Gemini 4 Argon is in your Gemini app and in AI Mode in Search starting today. Per 9to5Google, only the Ultra tier had it in the app until now. The developer tools are a different story: most need Ultra.

Who gets Argon today

Google says Argon is available globally today through the API, for AI Ultra subscribers in Antigravity, and for AI Pro and AI Ultra subscribers in the Gemini app and AI Mode. We found no country list for the Gemini app in the posts we read.

  • Google AI Pro: $20 a month in the US, per Engadget. Argon in the Gemini app and AI Mode.
  • Google AI Ultra: "at least $100" a month per Engadget; 9to5Google lists $99.99 and up. Adds Argon in the Antigravity desktop app and CLI and, per 9to5Google, AI Studio and Android Studio (Canary).
  • Gemini API: $2 per million input tokens and $10 per million output tokens until Nov. 30, then $4 and $20, per Google.

What Argon changes in the app

Google says the app version answers more directly with less hedging, repeats itself less, skips clichés and reports progress more often on longer tasks. Josh Woodward, Google's VP of Product for Gemini and Google Labs, said in Engadget's report it answers faster and can reply while still thinking on long jobs.

Google's post gives few app-level examples. In one, Argon takes a folder of project context, builds a client proposal deck with a custom skill, emails it, and sets a scheduled task for later requests. In another, using Antigravity in the Gemini macOS app, it turns a sketch of measurements and a photo of a couch into a 3D-printable sofa leg. Most other examples are coding work inside Google, such as a Chrome refactor and a Gemma inference speedup, and those are Google's own figures.

Google credits those coding gains for another change: Antigravity's agentic coding interface now sits inside the Gemini app for macOS, so you can switch between chatting and coding there. A new toggle in the main chat window moves from chat to tasks, previously called Spark, per 9to5Google. Google says Gemini now connects to more than 40 apps, including Instacart, OpenTable, Adobe and Shopify. The model picker lists 3.5 Flash-Lite, 3.8 Flash, 3.1 Pro and 4 Argon.

Last week's testing report, updated

Our Oct. 10 report said, citing Business Insider, that Argon was heading to the public with no consumer date, and that a newer build called Carbon was being tested inside Google. Argon is now live for Pro and Ultra subscribers. Google's posts do not mention Carbon, and we found nothing new on it.

Ultra gates the tools, and the API price doubles

Neither Google post gives usage limits for Pro or Ultra in the app, and we found none. Google's posts name no free-tier access to Argon. Per 9to5Google, the Antigravity desktop app and CLI need Ultra for the new model, as do AI Studio and Android Studio (Canary).

For developers the introductory API price ends Nov. 30, and it doubles after that. Google's post also says cached input tokens are 95 percent off at the introductory price.

Cost against GPT-6 Astra

Engadget reports that Artificial Analysis says Argon matches OpenAI's GPT-6 Astra on its Intelligence Index at 60 percent of the cost per task, at Argon's introductory prices. Google separately claims first place on the Vals Index, which is its own claim. That cost gap is measured before the Nov. 30 change.

Pro covers the app; Ultra is needed for the Antigravity app and CLI

Argon is untested by us, so this is judgment, not a review. If you mostly chat, Pro at $20 covers Argon in the app, and 3.1 Pro and 3.8 Flash stay in the picker if you prefer them. Skip Ultra unless you need the Antigravity desktop app or CLI, AI Studio or Android Studio (Canary), which 9to5Google says require it. Google does not say which plan gets the Antigravity coding interface inside the Gemini macOS app, so confirm that before paying for Ultra. Developers should budget on the post-Nov. 30 price, not the introductory one.

Plans, prices and availability come from Google's two posts, 9to5Google and Engadget, checked at 12:50 p.m. ET on Oct. 13, 2026, in US dollars.