Google's Gemini 4 Argon Spotted in Early A/B Tests on Antigravity Platform

Google's frontier language model, Gemini 4 Argon, is quietly reaching some users through A/B testing on its Antigravity agent platform, with early outputs showing significant improvements over the currently-deployed Gemini 3.8 Flash. Announced on September 30, 2026, Gemini 4 Argon represents a substantial leap in long-form reasoning capabilities, featuring a 1M token output limit—roughly 15 times greater than Gemini 3.8 Flash's 64K limit.