DeepSeek V4 Pro vs Gemini 3.1 Pro Preview
DeepSeek V4 Pro (2026) and Gemini 3.1 Pro Preview (2026) are frontier reasoning models from DeepSeek and Google DeepMind. DeepSeek V4 Pro ships a 1M-token context window, while Gemini 3.1 Pro Preview ships a 1M-token context window. On SWE-bench Verified, DeepSeek V4 Pro leads by a hair. On pricing, DeepSeek V4 Pro costs $0.43/1M input tokens versus $2/1M for the alternative. This comparison covers specs, pricing, capabilities, benchmarks, provider availability, and production fit.
DeepSeek V4 Pro is ~360% cheaper at $0.43/1M; pay for Gemini 3.1 Pro Preview only for coding workflow support.
Decision scorecard
Local evidence first| Signal | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1M | 1M |
| Cheapest output | $0.87/1M tokens | $12/1M tokens |
| Provider routes | 3 tracked | 4 tracked |
| Shared benchmarks | SWE-bench Verified leader | 4 rows |
Decision tradeoffs
- DeepSeek V4 Pro leads the largest shared benchmark signal on SWE-bench Verified by 0 points.
- DeepSeek V4 Pro has the lower cheapest tracked output price at $0.87/1M tokens.
- DeepSeek V4 Pro uniquely exposes Reasoning in local model data.
- Local decision data tags DeepSeek V4 Pro for Coding, RAG, and Agents.
- Gemini 3.1 Pro Preview leads the largest shared benchmark signal on Google-Proof Q&A by 4.2 points.
- Gemini 3.1 Pro Preview has broader tracked provider coverage for fallback and procurement flexibility.
- Gemini 3.1 Pro Preview uniquely exposes Vision, Multimodal, and Code execution in local model data.
- Local decision data tags Gemini 3.1 Pro Preview for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output prices on this page.
DeepSeek V4 Pro
$566
Cheapest tracked route: DeepSeek Platform
Gemini 3.1 Pro Preview
$4,600
Cheapest tracked route: Google AI Studio
Estimated monthly gap: $4,035. Batch, cache, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- Gemini 3.1 Pro Preview is $11.13/1M tokens higher on cheapest tracked output pricing, so quality gains need to justify the spend.
- Check replacement coverage for Reasoning before moving production traffic.
- Gemini 3.1 Pro Preview adds Vision, Multimodal, and Code execution in local capability data.
- Provider overlap exists on OpenRouter; start route-level A/B tests there.
- DeepSeek V4 Pro is $11.13/1M tokens lower on cheapest tracked output pricing before cache, batch, or negotiated discounts.
- Check replacement coverage for Vision, Multimodal, and Code execution before moving production traffic.
- DeepSeek V4 Pro adds Reasoning in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-04-24 | 2026-02-19 |
| Context window | 1M | 1M |
| Parameters | 1.6T | — |
| Architecture | mixture of experts | decoder only |
| License | MIT | Proprietary |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $0.43/1M tokens | $2/1M tokens |
| Output price | $0.87/1M tokens | $12/1M tokens |
| Providers |
Capabilities
| Capability | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
Benchmarks
| Benchmark | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| SWE-bench Verified | 80.6 | 80.6 |
| Google-Proof Q&A | 90.1 | 94.3 |
| Chatbot Arena | 1460.0 | 1493.0 |
| SWE-bench Pro | 55.4 | 54.2 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has DeepSeek V4 Pro at 80.6 and Gemini 3.1 Pro Preview at 80.6, with DeepSeek V4 Pro ahead by 0 points; Google-Proof Q&A has DeepSeek V4 Pro at 90.1 and Gemini 3.1 Pro Preview at 94.3, with Gemini 3.1 Pro Preview ahead by 4.2 points; Chatbot Arena has DeepSeek V4 Pro at 1460 and Gemini 3.1 Pro Preview at 1493, with Gemini 3.1 Pro Preview ahead by 33 points. The largest visible gap is 33 points on Chatbot Arena, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: Gemini 3.1 Pro Preview, multimodal input: Gemini 3.1 Pro Preview, reasoning mode: DeepSeek V4 Pro, and code execution: Gemini 3.1 Pro Preview. Both models share function calling, tool use, and structured outputs, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
For cost, DeepSeek V4 Pro lists $0.43/1M input and $0.87/1M output tokens, while Gemini 3.1 Pro Preview lists $2/1M input and $12/1M output tokens on the cheapest tracked provider. A 70/30 input-output blend puts DeepSeek V4 Pro lower by about $4.43 per million blended tokens. Availability is 3 providers versus 4, so concentration risk also matters.
Choose DeepSeek V4 Pro when reasoning depth and lower input-token cost are central to the workload. Choose Gemini 3.1 Pro Preview when coding workflow support and broader provider choice are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, DeepSeek V4 Pro or Gemini 3.1 Pro Preview?
DeepSeek V4 Pro supports 1M tokens, while Gemini 3.1 Pro Preview supports 1M tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Which is cheaper, DeepSeek V4 Pro or Gemini 3.1 Pro Preview?
DeepSeek V4 Pro is cheaper on tracked token pricing. DeepSeek V4 Pro costs $0.43/1M input and $0.87/1M output tokens. Gemini 3.1 Pro Preview costs $2/1M input and $12/1M output tokens. Provider discounts or batch pricing can still change the final bill.
Is DeepSeek V4 Pro or Gemini 3.1 Pro Preview open source?
DeepSeek V4 Pro is listed under MIT. Gemini 3.1 Pro Preview is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, DeepSeek V4 Pro or Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, DeepSeek V4 Pro or Gemini 3.1 Pro Preview?
Gemini 3.1 Pro Preview has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Where can I run DeepSeek V4 Pro and Gemini 3.1 Pro Preview?
DeepSeek V4 Pro is available on DeepSeek Platform, Fireworks AI, and OpenRouter. Gemini 3.1 Pro Preview is available on Google AI Studio, GCP Vertex AI, OpenRouter, and Replicate API. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
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Last reviewed: 2026-05-14. Data sourced from public model cards and provider documentation.