On Tuesday, Google made Gemini 4 Argon, the company’s new flagship model, available to developers on the paid tier of the Gemini API through Google AI Studio, as well as in several of the company’s other developer and consumer tools.
Google announced the model on September 30. Initial external access was limited to selected cyber defenders in its Fairwind Program and other trusted testers; Google employees were also using it internally.
Google is giving the model a competitive price. Developers will pay an introductory $2 per million input tokens and $10 per million output tokens through November 30, with a single 1 million-token budget for input and output combined. That’s the same price as OpenAI’s GPT-6.1 Sol.
After that date, Google’s new model will cost $4 and $20 per million tokens, matching Anthropic’s Claude Opus 5.5. Cached input tokens are 95 percent off during the introductory period.
During the introductory period, Argon also costs a fifth of what Anthropic charges for Claude Fable 5.1 and OpenAI charges for GPT-6 Astra, which both list at $10 and $50 per million tokens.
Developers can call the model as gemini-4-argon through Google’s Interactions API, with support in the google-genai SDKs. Android developers can also build it into their apps through Firebase AI Logic.
Argon’s unified 1 million input/output token limit covers both what goes into the model and what comes out of it, according to Google. That’s markedly different from how Google described it in the original Sept. 30 Argon announcement.
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