Google announced Gemini 4 Argon on September 30 and at first gave it only to a set of trusted cyber defenders through its Fairwind Program. On October 13 the model became generally available to developers and businesses, and it started rolling out in the Gemini app.
Who can use it
In the Gemini app and AI Mode in Search, Argon is available to Google AI Pro ($19.99 a month) and AI Ultra subscribers. It is not part of the Free or AI Plus plans. Developers can reach it through the paid Gemini API under the model ID gemini-4-argon, and businesses through Gemini for business and Google Cloud. In Google AI Studio and the Antigravity coding environment, Argon is offered to AI Ultra subscribers; Pro users there need a paid API key.
Price
Until November 30, 2026, the API costs $2 per million input tokens and $10 per million output tokens, with cached input at $0.10. From December 1 the price doubles to $4 and $20. Batch and Flex requests cost half. There is no free API tier for this model.
What Google says it can do
Argon accepts text, images, video, audio and PDFs and answers in text. It has a combined limit of about 1 million tokens for input and output together, with up to 65,536 output tokens by default. Google reports 77.9% on the DeepSWE coding benchmark and first place on the Vals Index, and says it cut the success rate of indirect prompt-injection attacks in Gray Swan's test to 0.7%. Alongside the launch, the Gemini app gained a tasks mode and connections to more than 40 apps.
Why it matters
Argon is Google's answer to GPT-6 Astra and Claude Opus 5.5, and at the introductory price it is among the cheapest frontier models to try through the API. For everyday users it is a reason to look at AI Pro rather than the cheaper AI Plus plan, which does not include it.