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 MMLU PRO, Gemini 3.1 Pro Preview leads by 3.5 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
DeepSeek V4 Pro is safer overall; choose Gemini 3.1 Pro Preview when coding workflow support matters.
Decision scorecard
Local evidence first| Signal | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Best for | reasoning-heavy apps, tool-calling agents, and long-context analysis | multimodal apps, tool-calling agents, and long-context analysis |
| 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 | 5 tracked | 5 tracked |
| Shared benchmarks | 11 shared | MMLU PRO leader |
Decision tradeoffs
- DeepSeek V4 Pro holds a shared-benchmark lead on SWE-bench Pro, ahead by 1.2 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 holds a shared-benchmark lead on MMLU PRO, ahead by 3.5 points.
- 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 route or tier on this page.
DeepSeek V4 Pro
$566
Cheapest tracked route/tier: DeepSeek Platform
Gemini 3.1 Pro Preview
$4,600
Cheapest tracked route/tier: Google AI Studio
Estimated monthly gap: $4,035. Batch, cache, alternate speed tiers, and negotiated pricing are excluded from this local estimate.
Switch friction
- Provider overlap exists on OpenRouter and Vercel AI Gateway; 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 and Vercel AI Gateway; 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 | MITOSI-approved | Proprietary |
| Openness | Open source | Proprietary |
| Weights | Available | Not released |
| Code | Unknown | Unknown |
| Commercial use | Commercial use: permitted | Commercial use: conditional |
| Knowledge cutoff | - | 2025-01 |
Pricing and availability
| Pricing attribute | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Input price | $0.43/1M tokens |
|
| Output price | $0.87/1M tokens |
|
| Providers |
Capabilities
| Capability | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| Vision | No | Yes |
| Multimodal | No | Yes |
| Reasoning | Yes | No |
| JSON / Tool use | Yes | Yes |
| Structured outputs | Yes | Yes |
| Code execution | No | Yes |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | DeepSeek V4 Pro | Gemini 3.1 Pro Preview |
|---|---|---|
| MMLU PRO | 87.5 | 91.0 |
| SWE-bench Verified | 80.6 | 80.6 |
| SWE-bench Pro | 55.4 | 54.2 |
| Google-Proof Q&A | 90.1 | 94.3 |
| LiveCodeBench | 93.5 | 91.7 |
| Humanity's Last Exam | 37.7 | 51.4 |
| HumanEval | 76.8 | 94.0 |
| Chatbot Arena | 1456.0 | 1493.0 |
| Massive Multitask Language Understanding | 90.1 | 98.0 |
| BrowseComp | 83.4 | 85.9 |
| MCP-Atlas | 69.4 | 69.2 |
Continue comparing
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Last reviewed: 2026-06-29. Data sourced from public model cards and provider documentation.