Agent Arena: Gemini 4 Hydrogen steps take 7.3s, 2.7x faster than Sonnet 5.5 at par quality
arena · x · 2026-11-13
LMArena reports Gemini 4 Hydrogen is the fastest model in the Agent Arena top 10: an average step takes 7.3 seconds, 2.7x faster than Claude Sonnet 5.5 and 3.1x faster than GPT-6.1 Sol.
- 82% of Hydrogen's tasks finish under 10 minutes vs 55% for GPT-6.1 Sol and 44% for Sonnet 5.5; within 30 minutes it's 97% vs 81%/78%
- Net improvement quality is on par with both models — no speed/quality trade-off
- Methodology: a step is one model API call, timed from first request to last streamed reply, excluding tool execution
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