Google has opened its Gemini 4 Argon model to all developers and businesses via API, and to paid Google AI Pro and Ultra subscribers in the Gemini app and Search AI Mode. API pricing is $2 per million input tokens and $10 per million output tokens, about 50% below normal, but the discount ends 30 November, after which standard prices return. If your team builds on AI tools or uses AI in apps or chatbots, this is a short window to test cheaper usage. Otherwise, no action is needed yet.