Gemini 4 Argon: Specs, Pricing (Before and After Dec 1), Benchmarks and API Quickstart
Gemini 4 Argon (gemini-4-argon) went GA Oct 13, 2026. $2/$10 per 1M tokens through Nov 30, $4/$20 from Dec 1. 1M unified window, 65,536 default output, paid tier only, implicit caching. Leads DeepSWE v1.1 (77.9%), trails Opus 5.5 on Terminal-Bench 4.0.