Google just released Gemini 4 Hydrogen on November 12 as its efficient daily driver for agentic workflows, priced at $1.50/$7.50 per million tokens with a 1M-token context. It immediately debuted at #10 in Code Arena: WebDev and #5 in Agent Arena on arena.ai, outperforming prior Gemini 3.8 Flash models on speed and benchmarks like Terminal-Bench while trailing frontier siblings Carbon and Argon. No Text Arena ranking has appeared yet, though earlier Flash variants entered that leaderboard shortly after launch. Traders are watching for rapid integration into the text-to-text evaluations, where competitive positioning against models like Claude Opus 5.5 and GPT variants could shift quickly on new data.