Gemini 3.1 Ultra vs DeepSeek-V4 Pro
Head-to-head technical comparison of intelligence, capabilities, and API pricing.
Which should you use?
Gemini 3.1 Ultra and DeepSeek-V4 Pro score within 0.7 points of each other on the composite index, which is too close to call a winner on capability alone.
Cost is the sharper difference: Gemini 3.1 Ultra is 46x the input price of DeepSeek-V4 Pro ($20 against $0.435 per 1M), so at volume the choice is usually decided by budget rather than benchmarks.
Pick Gemini 3.1 Ultra when
- Ahead on Arena Elo by 31 points (1480 vs 1449), which is outside the board's published confidence intervals.
- Stronger on MMLU-Pro: 92.5% against 91.8%.
Pick DeepSeek-V4 Pro when
- Cheaper input tokens — $0.435 against $20 per 1M, so Gemini 3.1 Ultra costs 46x as much to feed.
- Better value per point of measured capability: $0.005 per index point against $0.216.
Value per point of measured capability, at list input pricing: DeepSeek-V4 Pro $0.005 · Gemini 3.1 Ultra $0.216 per index point. Run your own token mix through the token cost calculator — a comparison at list price ignores caching and batch discounts, which move real bills more than this gap does.
Where these numbers come from
Figures as of 2026-09-14. Arena Elo and pricing are read from the public board and each vendor's own pricing page; see the full leaderboard for all 34 models and which columns are measured rather than estimated, or the benchmark matrix for scores benchmark by benchmark.