Gemini 4 Argon comes to the app for Pro and Ultra; the free version still runs on Auto
Google says Gemini 4 Argon is in the app for Pro and Ultra subscribers. The free version runs on Auto mode, and the headline figures in the announcement are Google's own, mostly about engineering work.
You use the free version of Gemini, you keep seeing the name Gemini 4 Argon everywhere, and you want to know one thing: are you using it?
Read side by side, Google’s own two pages lean towards “no”, with one gap that Google has not spelled out.
Which plans the announcement mentions
The announcement of 13 October 2026 says you can try Argon in the Gemini app and in AI Mode in Search if you subscribe to Google AI Ultra or Pro. In Google Antigravity, a tool for people who write software, Argon is for the Ultra plan. Developers reach it through the paid tier of the Gemini API. Google says the model is rolling out globally but does not list countries, so the post does not say whether Vietnam is in the first wave.
The post does not mention free users. That is a gap, not a statement that the free version will never get Argon.
What the free version runs
From 9 October, according to the Gemini help page, people without an AI plan are set to Auto mode by default, and most questions go to the lightweight Flash-Lite model. The more telling detail: that page does not mention Gemini 4 Argon at all.
Put the two pages together: Argon sits behind the paid door, while the free version runs lighter tiers. That is this article’s reading of two Google pages, not a sentence Google wrote.
Checking Google’s numbers: who are they about?
The announcement has plenty of headline figures: first place on the Vals Index, 87% on the ERQA test of reasoning about the physical world, and a 0.7% attack success rate on Gray Swan’s indirect prompt-injection test. All of them come from Google or its partners. The sources we opened contain no independent measurement.
The two figures most likely to mislead are about a narrow group. According to Google, in its internal engineering work the number of code submissions made by agents (AI assistants that write and submit code on an engineer’s behalf) rose by more than 35%, and the number of rollbacks fell by nearly a third. That is a result for software engineers, not for someone writing emails or revising for an exam.
The price of $2 per million input tokens (a token is a chunk of text the model reads and writes, and the unit developers pay for) and $10 for output, rising to $4 and $20 after 30 November 2026, is the developer API price. It is not the price of a Pro plan, and app users do not pay by this table.
Paying, or staying on the free version
A new model name is a reason to try something, not a reason to pay. If you use the free version and its answers are good enough for your work, there is no button you need to press to “move up” to Argon.
If you are thinking about Pro, the step you can take today is to look in the app, on your own account, at what price the Pro plan shows and whether it offers a trial. By the reading above, a free account does not run Argon on its own, so you can only try it before paying if the Pro screen itself offers a trial; trust only the terms written on that screen.
Before subscribing, copy down two or three questions you have had to correct most often, along with the free version’s answers. The real test comes after you have the plan: ask the same questions again, put the two answers side by side, then decide whether to keep or cancel before the renewal date. A vendor’s leaderboard cannot tell you that.
Sources
- Google — Introducing Gemini 4 Argon — published 13 October 2026. Names the Pro and Ultra plans in the app, the API price and the 30 November date, and the figures reported by Google and its partners.
- Gemini Help — models and limits in the Gemini app — states the default Auto mode for people without a plan from 9 October 2026 and how Auto chooses between Flash-Lite, Flash or Pro.