Gemini 3.1 Ultra vs DeepSeek-V4 Pro

Head-to-head technical comparison of intelligence, capabilities, and API pricing.

Gemini 3.1 Ultra

Google

AI Mastery Index92.5

LMSYS Arena1480

Technical (MMLU-Pro)92.5%

Cost per 1M Tokens$20

DeepSeek-V4 Pro

DeepSeek

AI Mastery Index91.8

LMSYS Arena1449

Technical (MMLU-Pro)91.8%

Cost per 1M Tokens$1.32

Architect's Verdict

When comparing Gemini 3.1 Ultra and DeepSeek-V4 Pro, Gemini 3.1 Ultra edges out in overall capabilities according to the AI Mastery Index. However, for cost-sensitive workloads, DeepSeek-V4 Pro offers a more economical API at $1.32 per 1M tokens. Your choice should depend heavily on whether you prioritize raw reasoning (MMLU) or scalable deployment economics.