DeepSeek V4 Pro vs Gemini 3.1 Pro — Price, Context, and Capability Compared
DeepSeek V4 Pro vs Gemini 3.1 Pro: which should I use?
Gemini 3.1 Pro costs 2.3× more per blended million tokens than DeepSeek V4 Pro. Gemini 3.1 Pro has the larger context window (2,000,000 tokens). Default to DeepSeek V4 Pro unless you specifically need Gemini 3.1 Pro's edge.
Price, speed, and task evidence
Task verdict
Best-fit task signals from the published model strengths; this is not a substitute for a controlled benchmark.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Best fit | Rigorous math, proofs, and hard algorithmic problems on a budget. | Whole-codebase, whole-document, or long-video analysis in a single request. |
| Reasoning mode | Available | Available |
Effective workload cost
Modeled for Coding Agent: 20,000 input + 2,000 output tokens per task, 1 turn. This is a workload model, not a provider quote.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Coding Agent / task | $0.03 (modeled) (winner) | $0.06 (modeled) |
| Input / output rate | $1.32 / $3.96 per M | $2.00 / $12.00 per M |
Speed
Only non-estimated benchmark results are shown as measured.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Measured throughput | 68 tokens/s (winner) | 55 tokens/s |
| Time to first token | 480 ms | 420 ms |
API compatibility
Provider-level wire-format and SDK facts; model-specific parameter differences may still apply.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| OpenAI SDK | Usable | Not drop-in |
| Request shape | OpenAI-compatible chat/completions; set model to a deepseek-* id and point base_url at api.deepseek.com. | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. |
| Streaming | SSE (OpenAI delta) | SSE (Gemini streamGenerateContent) |
Privacy and retention
Provider policy and residency facts from the verified provider registry. A missing retention policy is not treated as a guarantee.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Provider says API data trains models | Unavailable | No |
| Published retention period | Unavailable | Unavailable |
| Data residency | Unavailable | Global by default; Vertex AI offers selectable regional endpoints |
Migration effort
Direction is from each displayed model to the other. Effort is derived from provider compatibility and published parameter maps.
| Fact | DeepSeek V4 Pro | Gemini 3.1 Pro |
|---|---|---|
| Move DeepSeek V4 Pro → Gemini 3.1 Pro | code-change; 0 breaking parameter differences | Target: Gemini 3.1 Pro |
| Move Gemini 3.1 Pro → DeepSeek V4 Pro | Source: Gemini 3.1 Pro | config; 6 breaking parameter differences |
| Why | contents/parts structure instead of messages; an OpenAI-compatible endpoint exists but only covers a subset of parameters. | Keep the `openai` SDK; change `baseURL` and the API key. |
Spec comparison
| DeepSeek V4 Pro | Gemini 3.1 Pro | |
|---|---|---|
| Price (input) | $1.32/M ✓ | $2.00/M |
| Price (output) | $3.96/M ✓ | $12.00/M |
| Blended price | $1.98/M ✓ | $4.50/M |
| Context window | 1,000,000 tokens | 2,000,000 tokens ✓ |
| Max output | 384,000 tokens ✓ | 64,000 tokens |
| Modalities | text | text, vision, audio |
| Reasoning mode | Yes | Yes |
| Released | 2026-05 | 2026-02 |
| Speed | 68 t/s ✓ | 55 t/s |
Cost at scale (3:1 blended)
| Tokens / month | DeepSeek V4 Pro | Gemini 3.1 Pro | Delta |
|---|---|---|---|
| 1,000,000 | $1.98 | $4.50 | $2.52 (2.3×) |
| 10,000,000 | $19.80 | $45.00 | $25.20 (2.3×) |
| 100,000,000 | $198.00 | $450.00 | $252.00 (2.3×) |
Choose DeepSeek V4 Pro if…
- ✓Thinking mode with visible chain-of-thought
- ✓Frontier-level math and competition coding
- ✓Still far cheaper than closed frontier models
- ✓Rigorous math, proofs, and hard algorithmic problems on a budget.
Choose Gemini 3.1 Pro if…
- ✓Largest context window of any current model (2M tokens)
- ✓Native audio and video understanding
- ✓Google Search grounding
- ✓Whole-codebase, whole-document, or long-video analysis in a single request.
Run this exact matchup right now
Send the same prompt to DeepSeek V4 Pro and Gemini 3.1 Pro side by side and see the outputs yourself.
Try DeepSeek V4 Pro vs Gemini 3.1 Pro FreeFAQ
Is DeepSeek V4 Pro cheaper than Gemini 3.1 Pro?
DeepSeek V4 Pro is cheaper, at $1.98 per million blended tokens vs $4.50 for Gemini 3.1 Pro.
Which has the bigger context window, DeepSeek V4 Pro or Gemini 3.1 Pro?
Gemini 3.1 Pro has the larger context window: 2,000,000 tokens vs 1,000,000.
Can DeepSeek V4 Pro replace Gemini 3.1 Pro for coding?
Both are viable for coding. Thinking mode with visible chain-of-thought (DeepSeek V4 Pro) vs Largest context window of any current model (2M tokens) (Gemini 3.1 Pro) — pick based on which strength matters more for your workload.
Which is faster, DeepSeek V4 Pro or Gemini 3.1 Pro?
DeepSeek V4 Pro is faster: 68 t/s vs 55 t/s, measured on our speed benchmarks.
Neither of these? See DeepSeek V4 Pro alternatives or Gemini 3.1 Pro alternatives.
Related
Pricing verified 2026-04-06. Specs verified 2026-08-14.