DeepSeek V4 Pro vs Gemini 3.1 Pro
Both are Flagship-tier models, from DeepSeek and Google respectively. DeepSeek V4 Pro is the cheaper choice overall at a 4:1 input:output ratio.
Which is cheaper
- Input price: DeepSeek V4 Pro is cheaper ($1.32 vs $2.00).
- Output price: DeepSeek V4 Pro is cheaper ($3.96 vs $12.00).
- Blended, 4:1 input:output ratio: DeepSeek V4 Pro is 53.8% cheaper ($1.85 vs $4.00 per weighted 1M tokens).
Side by side
| Spec | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Provider | DeepSeek | |
| Tier | Flagship | Flagship |
| Context window | 1M | 1M |
| Max output | 384K | 66K |
| Input $/1M | $1.32 | $2.00 |
| Output $/1M | $3.96 | $12.00 |
| Cache read $/1M | $0.044 | $0.20 |
| Modalities | text | text, image |
DeepSeek V4 Pro. Peak cache-miss rate, which is this dataset's standard tier. DeepSeek's own page states off-peak rates are half the peak rates, with peak hours 01:00-04:00 and 06:00-10:00 UTC Monday to Friday: off-peak is $0.66 input / $1.98 output, cache-hit input $0.022. The off-peak half-price is a time-of-day discount and is excluded here for the same reason batch and cached-input discounts are.
Gemini 3.1 Pro. Listed as gemini-3.1-pro-preview. Standard tier for prompts up to 200K tokens; above that, $4 input / $18 output and $0.40 cache read per 1M. Cached context is also billed for storage at $4.50 per 1M tokens per hour.
Sources
DeepSeek V4 Pro — verified August 30, 2026
Gemini 3.1 Pro — verified August 29, 2026
Full DeepSeek V4 Pro pricing page → · Full Gemini 3.1 Pro pricing page →