# DeepSeek-V3.1-Terminus vs Gemini 3.1 Pro Preview

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.1 on the Noometry Index. DeepSeek-V3.1-Terminus costs 9.9× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/deepseek-v3-1-terminus-vs-gemini-3-1-pro-preview
- Last updated: 2026-10-12
- Shared benchmarks: 15

## Summary

- They share 15 benchmarks with published results for both. DeepSeek-V3.1-Terminus scores higher in 0 categories and Gemini 3.1 Pro Preview in 7 categories; 6 gaps are clear of the uncertainty.
- The widest gap is in reasoning, where Gemini 3.1 Pro Preview leads 71.7 to 26.4.
- The biggest single-benchmark swing is LMCA: 28.6% for DeepSeek-V3.1-Terminus and 53.8% for Gemini 3.1 Pro Preview.
- DeepSeek-V3.1-Terminus is cheaper at $0.27 / $1 per million input/output tokens, against $2 / $12 for Gemini 3.1 Pro Preview.
- Gemini 3.1 Pro Preview accepts more context: 1.05M tokens versus 164K.
- DeepSeek-V3.1-Terminus has downloadable open weights; the other is API-only.

## Snapshot

| | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| Provider | DeepSeek | Google |
| Noometry Index | 43.1 | 56.7 |
| Rank | 97 | 23 |
| Context | 164K | 1.05M |
| Input $/M | $0.27 | $2 |
| Output $/M | $1 | $12 |
| Weights | Open | Proprietary |

## Coding

- DeepSeek-V3.1-Terminus: 42.0 (#113)
- Gemini 3.1 Pro Preview: 42.5 (#99)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| SciCode | 40.6% | 58.9% |
| LMArena Coding | 1426 | 1484 |
| ALE-Bench | 745.17 | 1,161 |
| SWE-bench Verified | — | 75.6% |
| DeepSWE | — | 11.7% |
| LMArena WebDev | — | 1447 |
| GSO | — | 22.6% |
| WeirdML | — | 72.1% |
| MirrorCode | — | 8.9% |
| AlgoTune | — | 2.02 |

## Agentic & Tool Use

- DeepSeek-V3.1-Terminus: —
- Gemini 3.1 Pro Preview: 37.7 (#34)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| Terminal-Bench | — | 80.2% |
| APEX-Agents | — | 35.3% |
| τ²-bench Banking | — | 26% |
| DeepResearch Bench | — | 47.8% |
| PostTrainBench | — | 22% |
| BALROG | — | 57% |
| ExploitBench | — | 26.1% |
| GBAEval | — | 0.8% |
| GDP.pdf | — | 17% |
| LMArena Search | — | 1211 |
| METR Time Horizons | — | 77% |
| Vending-Bench 2 | — | 3,774 |

## Reasoning

- DeepSeek-V3.1-Terminus: 26.4 (#133)
- Gemini 3.1 Pro Preview: 71.7 (#12)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| CritPt | 1.7% | 17.7% |
| LMArena Hard Prompts | 1426 | 1485 |
| DTBench | 81.3% | 97.1% |
| LMCA | 28.6% | 53.8% |
| ARC-AGI-2 | — | 77.1% |
| SimpleBench | — | 79.6% |
| Kagi LLM Benchmark | 57.4% | — |
| NYT Connections (extended) | — | 97.4% |
| ARC-AGI-1 | — | 98% |
| Chess Puzzles | — | 55% |
| EnigmaEval | — | 36.8% |
| Thematic Generalization | — | 79.4% |
| EBR-Bench | — | 14.3% |
| Mystery Game Puzzles | — | 34% |
| Epoch Capabilities Index | — | 154.77 |
| ForecastBench | — | 59 |

## Math

- DeepSeek-V3.1-Terminus: 38.5 (#137)
- Gemini 3.1 Pro Preview: 62.1 (#34)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Math | 1402 | 1485 |
| FrontierMath (Tiers 1-3) | — | 59.6% |
| FrontierMath Tier 4 | — | 26.8% |
| MathArena Final-Answer Competitions | — | 86.5% |
| OTIS Mock AIME 2024-2025 | — | 95.6% |
| ProofBench | — | 26% |
| FrontierMath (Feb 2025 set) | — | 36.9% |
| FrontierMath Tier 4 (v1) | — | 16.7% |

## Knowledge

- DeepSeek-V3.1-Terminus: —
- Gemini 3.1 Pro Preview: 71.8 (#3)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| GPQA Diamond | — | 94.4% |
| Humanity's Last Exam | — | 46.4% |
| SimpleQA Verified | — | 73.5% |
| Vectara Hallucination Rate | — | 10.4% |
| LMArena Expert | — | 1485 |

## Multimodal

- DeepSeek-V3.1-Terminus: —
- Gemini 3.1 Pro Preview: 37.9 (#69)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Vision | — | 1296 |
| Blueprint-Bench 2 | — | 26.5% |
| Furniture Assembly | — | 26.7% |
| LMArena Document | — | 1444 |

## Multilingual

- DeepSeek-V3.1-Terminus: 52.1 (#92)
- Gemini 3.1 Pro Preview: 57.0 (#12)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Non-English | 1407 | 1477 |
| LMArena Russian | 1436 | 1498 |
| LMArena Chinese | — | 1529 |
| LMArena French | — | 1487 |
| LMArena German | — | 1491 |
| LMArena Japanese | — | 1493 |
| LMArena Korean | — | 1455 |
| LMArena Spanish | — | 1479 |

## Instruction Following

- DeepSeek-V3.1-Terminus: 74.0 (#106)
- Gemini 3.1 Pro Preview: 77.0 (#32)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Instruction Following | 1404 | 1466 |

## Long Context

- DeepSeek-V3.1-Terminus: 43.4 (#97)
- Gemini 3.1 Pro Preview: 47.4 (#18)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Longer Query | 1421 | 1483 |
| CL-bench | — | 20.8% |
| CL-bench Life | — | 16.9% |

## Writing & Preference

- DeepSeek-V3.1-Terminus: 61.0 (#92)
- Gemini 3.1 Pro Preview: 66.1 (#37)

| Benchmark | DeepSeek-V3.1-Terminus | Gemini 3.1 Pro Preview |
|---|---|---|
| LMArena Text | 1419 | 1481 |
| LMArena Creative Writing | 1403 | 1482 |
| LMArena Multi-Turn | 1411 | 1488 |
| EQ-Bench Creative Writing | — | 1491 |
| EQ-Bench 4 | — | 1142 |

## FAQ

### Is DeepSeek-V3.1-Terminus better than Gemini 3.1 Pro Preview?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 43.1 on the Noometry Index. DeepSeek-V3.1-Terminus costs 9.9× less per token, which makes it the better buy when Gemini 3.1 Pro Preview's lead doesn't matter for your workload.

### Which is cheaper, DeepSeek-V3.1-Terminus or Gemini 3.1 Pro Preview?

DeepSeek-V3.1-Terminus is cheaper. It lists at $0.27 per million input tokens and $1 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is DeepSeek-V3.1-Terminus or Gemini 3.1 Pro Preview better for coding?

They score almost the same on coding (42.0 vs 42.5); test both on your own repository before choosing.

### Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 164K.

### How many benchmarks do DeepSeek-V3.1-Terminus and Gemini 3.1 Pro Preview share?

15 benchmarks have published results for both models. DeepSeek-V3.1-Terminus has 16 scored results on Noometry and Gemini 3.1 Pro Preview has 71.