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Google’s October 13 launch post says Argon is “now globally available today”; Business Insider[1] reports the rollout on the same date. This dates the rollout’s start, not simultaneous access for every account.Google began rolling out Gemini 4 Argon on October 13 to paid API customers and Pro and Ultra Gemini app subscribers. Introductory API pricing is $2 per million input tokens and $10 per million output tokens through November 30.