Gemini 4 Argon

Gemini 4 Argon is Google's frontier model, generally available since 13 October 2026 after a first release limited to cyber defenders. Google lists a 1M-token unified input-and-output limit, long decode of up to 1M output tokens, and low, medium and high thinking levels.

Best for

• Very long single outputs — large code migrations, long reports
• Long, multi-step agentic and coding work
• Legal, finance and tax knowledge work (it led the Vals Index, per Google)
• Workloads exposed to prompt injection, where Google reports a 0.7% attack success rate

How it compares — and the India angle

• The price doubles on 30 November 2026: $2/$10 per million becomes $4/$20. Cached input is 95% off either way. Budget at the higher rate.
• It is not on the free tier of the Gemini API — you need the paid tier. In the Gemini app it is for Google AI Pro and Ultra subscribers.
• Against the $10/$50 flagships (GPT-6 Astra, Claude Fable 5.1) it is far cheaper on paper; against Claude Opus 5.5 ($4/$20) it is cheaper only until the promotion ends.
• Google's post does not mention India specifically, but the API is described as globally available.