Gemini 4 Argon is now on sale, and its introductory price ends on November 30

Gemini 4 Argon became generally available on October 13, and the introductory rate Google published without an end date now has one. Google's model page says the introductory pricing runs through November 30, 2026, and that from December 1 the model costs $4 per million input tokens and $20 per million output tokens, with thinking tokens counted as output.

Google says AI Ultra and Pro subscribers get Argon in the Gemini app and in AI Mode in Search. Image: Google

Until then it is $2 per million input tokens and $10 per million output, with cached input at $0.10 per million rising to $0.20 on December 1. Google's API changelog dates the release to October 13 and gives the model string as gemini-4-argon.

The app route needs a paid Google subscription

Google says Argon is globally available to developers and enterprises through the API in AI Studio and the Gemini platform, to Google AI Ultra and Pro subscribers in the Gemini app and in AI Mode in Search, and to AI Ultra subscribers in Google Antigravity.

Google's API documentation also says Argon is not available on the Free tier or on the Google AI Pro plan. Google lists API access and subscription access separately, so that restriction covers the API's own plans, not the Gemini app, where the same launch post gives Argon to AI Ultra and Pro subscribers. When Mixed News reported Argon's price on October 2, Google had published neither a model ID nor any way to buy it.

Google tells developers to allow 15-minute timeouts

Argon has one window of 1,048,576 tokens that input, thinking and output all share, and a default output limit of 65,536 tokens. Google says hard prompts can take several minutes, recommends running them in the background, and tells developers to set HTTP client timeouts to at least 15 minutes.

The output half of that window was the news in September, when Argon lifted Google's output ceiling to a million tokens while only cyber defenders could reach it. What changed on October 13 is who can send a request at all. Access without cyber guardrails runs through the Fairwind Program Google set up for trusted defenders, which Google says it is now expanding to hundreds of additional partners and which cyber defenders can apply to join on a rolling basis.

Google puts Argon first on the Vals Index

Google says Argon ranks first on the Vals Index, which it describes as measuring performance across economic sectors including finance, coding, legal and tax, and scores 87% on the Embodied Reasoning benchmark, which it calls the top score among frontier models. It also cites 57% on RareBench for rare-disease diagnosis and 52.2% on LabBench for wet-lab reasoning, both from private Gamow Labs evaluations.

Two more of Google's numbers come from its own engineers. Google says Argon in Antigravity has helped teams inside Google lift agentic code submissions by more than 35% and cut code rollbacks by nearly a third. On the consumer side it puts Antigravity's agentic coding interface in the Gemini macOS app and says Gemini now connects to more than 40 apps.

The introductory rate runs to November 30, and Google says the $4 and $20 prices that follow on December 1 apply to the Argon model intended for public access.