DeepSeek V4 Pro is $1.56 cheaper per 1M input tokens (78.2% lower; 4.6x difference).
API cost decision in 10 seconds
DeepSeek V4 Pro vs Gemini 3.1 Pro Preview Custom Tools
Pick DeepSeek V4 Pro for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick DeepSeek V4 Pro for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.
On the standard 1M input plus 500K output workload, DeepSeek V4 Pro is estimated at $0.87 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.13 (89.1% lower).
Cost-first pickDeepSeek V4 Pro
Context-first pickGemini 3.1 Pro Preview Custom Tools
Sample savings$7.1389.1%
10x traffic gap$71.3
Gemini 3.1 Pro Preview Custom Tools has more context, but DeepSeek V4 Pro saves $7.13 on the standard workload. At 10x that traffic, the same price gap is about $71.3. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
DeepSeek V4 Pro stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | DeepSeek V4 Pro | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | DeepSeek V4 Pro | $2.61 | $16 |
| Balanced workload | 1M input + 1M output | DeepSeek V4 Pro | $1.3 | $14 |
| Output-heavy chatbot | 1M input + 5M output | DeepSeek V4 Pro | $4.78 | $62 |
DeepSeek V4 Pro is $11.13 cheaper per 1M output tokens (92.8% lower; 13.8x difference).
Gemini 3.1 Pro Preview Custom Tools has 180 more context (1x larger).
DeepSeek V4 Pro is $7.13 cheaper on the standard workload (89.1% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
DeepSeek V4 Pro has the lower input price; DeepSeek V4 Pro has the lower output price; Gemini 3.1 Pro Preview Custom Tools offers the larger context window. For the 1M input plus 500K output sample, DeepSeek V4 Pro is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.87 for DeepSeek V4 Pro and $8 for Gemini 3.1 Pro Preview Custom Tools.
Choose DeepSeek V4 Pro when you care most about lower input-token price, and lower output-token price.
Choose Gemini 3.1 Pro Preview Custom Tools when you care most about larger context window.
- On the standard 1M input plus 500K output workload, DeepSeek V4 Pro is estimated at $0.87 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.13 (89.1% lower).
- DeepSeek V4 Pro is $7.13 cheaper on the standard workload (89.1% lower).
- DeepSeek V4 Pro is $1.56 cheaper per 1M input tokens (78.2% lower; 4.6x difference).
- DeepSeek V4 Pro is $11.13 cheaper per 1M output tokens (92.8% lower; 13.8x difference).
- Gemini 3.1 Pro Preview Custom Tools has 180 more context (1x larger).
| Feature | DeepSeek V4 Pro (DeepSeek) | Gemini 3.1 Pro Preview Custom Tools (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.435 | $2 |
| Completion Price per 1M tokens | $0.87 | $12 |
| Sample Workload Cost 1M input + 500K output | $0.87 | $8 |
| Context Window | 1.05M | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | DeepSeek V4 Pro | On the standard 1M input plus 500K output workload, DeepSeek V4 Pro is estimated at $0.87 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $7.13 (89.1% lower). |
| High-volume input processing | DeepSeek V4 Pro | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | DeepSeek V4 Pro | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Gemini 3.1 Pro Preview Custom Tools | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- DeepSeek V4 Flash (free) can replace DeepSeek V4 Pro when lower sample workload cost matters most: $0.
- DeepSeek V4 Flash can replace DeepSeek V4 Pro when lower sample workload cost matters most: $0.2.
- R1 Distill Qwen 32B can replace DeepSeek V4 Pro when lower sample workload cost matters most: $0.43.
- DeepSeek V3.2 can replace DeepSeek V4 Pro when lower sample workload cost matters most: $0.44.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
- No popular competitor is currently available.
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
Open cheapest modelsLarger context alternatives
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Open provider hubsDeepSeek catalog
Review all tracked DeepSeek models before deciding whether this matchup is the right shortlist.
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Open Google modelsDeepSeek V4 Pro is a large-scale Mixture-of-Experts model from DeepSeek with 1.6T total parameters and 49B activated parameters, supporting a 1M-token context window. It is designed for advanced reasoning, coding,...
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...