Gemini 3.1 Pro Preview vs DeepSeek V3.1 Terminus
Head-to-head specifications
| Metric | Gemini 3.1 Pro Preview | DeepSeek V3.1 Terminus | Difference |
|---|---|---|---|
| Intelligence Index | 46.0 | 26.0 | +76.9% |
| Coding Index | 68.8 | 43.5 | +58.2% |
| Agentic Index | 21.4 | 18.1 | — |
| Context window | 1M tokens | 200K tokens | — |
| Blended price ($/1M tokens) | $0.91 | $0.31 | +193.5% |
| Access | Proprietary API | Open weights | — |
- Gemini 3.1 Pro Preview leads overall capability (Intelligence Index 46.0 vs 26.0).
- DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 2.9× cheaper.
- Gemini 3.1 Pro Preview offers the larger context window (1M tokens), useful for long documents and codebases.
Verdict: Gemini 3.1 Pro Preview or DeepSeek V3.1 Terminus?
Gemini 3.1 Pro Preview advantages
- General intelligence (+43%)
- Coding ability (+37%)
- Agentic task performance (+15%)
- Context window (+80%)
DeepSeek V3.1 Terminus advantages
- Affordability (+66%)
Which should you choose?
- Choose the Gemini 3.1 Pro Preview if you need the strongest overall reasoning and accuracy.
- Choose the DeepSeek V3.1 Terminus if you want the lowest cost per token at scale.
- Choose the Gemini 3.1 Pro Preview if coding and software development are your main workload.
Value for money
DeepSeek V3.1 Terminus offers more intelligence per dollar (1.7× the Intelligence-Index-per-cost of the alternative), making it the stronger value for high-volume use. It is also open-weight, so self-hosting can reduce costs further at scale.
Gemini 3.1 Pro Preview vs DeepSeek V3.1 Terminus: which should you choose?
Gemini 3.1 Pro Preview — Google multimodal model with an Intelligence Index of 46, a 1M-token context window and a blended price of $0.91/1M tokens.
DeepSeek V3.1 Terminus — DeepSeek text model with an Intelligence Index of 26, a 200K-token context window and a blended price of $0.31/1M tokens (open weights).
Gemini 3.1 Pro Preview vs DeepSeek V3.1 Terminus: Gemini 3.1 Pro Preview scores higher on the Intelligence Index. Gemini 3.1 Pro Preview leads overall capability (Intelligence Index 46.0 vs 26.0). DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 2.9× cheaper.
Capability: intelligence, coding and agentic work
On the composite Intelligence Index the Gemini 3.1 Pro Preview scores 46.0 versus 26.0. For software development, the Coding Index puts Gemini 3.1 Pro Preview ahead (68.8 vs 43.5). On agentic, multi-step tool-use tasks, Gemini 3.1 Pro Preview measures stronger. Composite indices summarize many evaluations, but always test on your own workload before committing.
Context window and speed
The Gemini 3.1 Pro Preview accepts up to 1 million tokens per request, which sets how much documentation, transcript or code it can reason over at once.
Pricing and access
At blended per-token rates, DeepSeek V3.1 Terminus is the cheaper model to run ($0.31 vs $0.91 per 1M tokens). Gemini 3.1 Pro Preview is proprietary api and DeepSeek V3.1 Terminus is open weights. Open-weight models can be self-hosted, trading per-call cost for infrastructure you manage; for production also weigh rate limits, throughput and data-residency requirements.
The verdict
Both are credible choices in the ai model comparison space; the specification table above lays out every metric so you can weigh the trade-offs that matter to you. Pick the one whose strengths line up with how you will actually use it.
Frequently asked questions
Is the Gemini 3.1 Pro Preview better than the DeepSeek V3.1 Terminus?
Gemini 3.1 Pro Preview takes the overall edge, though DeepSeek V3.1 Terminus wins in specific areas worth weighing. Gemini 3.1 Pro Preview leads overall capability (Intelligence Index 46.0 vs 26.0).
What is the main difference between the Gemini 3.1 Pro Preview and the DeepSeek V3.1 Terminus?
Gemini 3.1 Pro Preview leads overall capability (Intelligence Index 46.0 vs 26.0). DeepSeek V3.1 Terminus is the cheaper model to run at $0.31/1M blended tokens — about 2.9× cheaper.
Which is better value?
DeepSeek V3.1 Terminus offers more intelligence per dollar (1.7× the Intelligence-Index-per-cost of the alternative), making it the stronger value for high-volume use. It is also open-weight, so self-hosting can reduce costs further at scale.
Which should I choose?
Choose the Gemini 3.1 Pro Preview if you need the strongest overall reasoning and accuracy. Choose the DeepSeek V3.1 Terminus if you want the lowest cost per token at scale.
Methodology
Large language models are compared on independent leaderboard metrics: an Intelligence Index (a composite of reasoning and knowledge evaluations), Coding and Agentic indices where measured, community arena Elo, maximum context window, a blended API price per million tokens (weighted across cache-hit, input and output rates), and measured output speed in tokens per second. Where a model ships multiple reasoning-effort variants, we report its strongest variant. Benchmarks capture only part of real-world quality, which also depends on tool use, latency, safety and task fit — and this space moves quickly, so figures reflect the leaderboard snapshot on the page date.