Gemini 4 Argon, Google's newest frontier model, is now rolling out worldwide, with API access for developers and enterprises at an introductory $2 per million input tokens and $10 per million output tokens. Cached input tokens for Gemini 4 Argon cost 95% less at launch.
The low rate has an end date. Google says the introductory period for Gemini 4 Argon expires on November 30, 2026, after which the price doubles to $4 per million input tokens and $20 per million output tokens. That higher figure applies to the public-access version of Gemini 4 Argon, so teams budgeting an agent workload on it should plan around the second number, not the first. Output tokens cost five times as much as input at either rate, which matters most for agents that write long code diffs and reports rather than read large files.
Access depends on what a customer pays for. Developers get Argon through the paid Gemini API tier in AI Studio and Android Studio. Google AI Ultra subscribers can also use it in Antigravity, Google's agentic coding environment, while Ultra and Pro subscribers get it in the Gemini app and in AI Mode in Search. Businesses can reach it through Gemini for business, the API and Antigravity. Free-tier users are not on the list.
Google positions Argon as a model for long, multi-step work in coding, finance, legal, cybersecurity and science, and says it ranks first on the Vals Index, a benchmark of performance on finance, coding, legal and tax tasks. It also reports an 87% score on the ERQA embodied-reasoning test. These are Google's own comparisons. The model supports a combined input-and-output limit of one million tokens, and Google points developers to a new continuation protocol they need to set up for very long runs.
The strongest evidence offered is internal. Google says teams using Argon in Antigravity raised agentic code submissions by more than 35% while cutting code rollbacks by nearly a third. In one case the Agent Development Kit team let the model work overnight on its Python framework, and Google credits it with a 40% cut in in-memory session prep time for long sessions and 21% faster cold imports.
Security work gets separate treatment. Google is extending Argon to hundreds of additional partners in its Fairwind Program, who can request access without the model's cyber guardrails, and says security firm Wiz used it to find a file-download bypass that exposed an administrator key in healthcare infrastructure. Google also offers 10,000 scientists the top Antigravity usage tier free for six months, subject to eligibility and selection. Argon is only the first model in its family, Google says, with the rest still to come.
