Gemini 4 Argon is Google flagship reasoning model. API pricing is 2 dollars per million input tokens and 10 dollars per million output through 30 November 2026, rising to 4 and 20 dollars from 1 December. Context caching runs 0.10 dollars rising to 0.20 on the same date. Batch and Flex tiers sit at half the standard rate before 1 December and double with it.
It scores 50 on the Artificial Analysis Intelligence Index. Published results include GraphWalks at 84.2 per cent, SEC-bench Pro at 83.4 per cent, Terminal-Bench 4.0 at 57.1 per cent and Chartography at 71.6 per cent.
Since 12 November the smaller Gemini 4 Hydrogen scores above it on the same index, at 51, and leads on agentic coding and tool use. Argon remains the stronger choice for deep reasoning, chart reading and document work, which is where its published leads sit.