# Gemini 3.1 Pro Preview vs Llama 3-8B

> Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 25.3 on the Noometry Index. Llama 3-8B costs 32× 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/gemini-3-1-pro-preview-vs-llama-3-8b
- Last updated: 2026-10-10
- Shared benchmarks: 23

## Summary

- They share 23 benchmarks with published results for both. Gemini 3.1 Pro Preview scores higher in 8 categories and Llama 3-8B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Gemini 3.1 Pro Preview leads 71.8 to 7.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 95.6% for Gemini 3.1 Pro Preview and 1.9% for Llama 3-8B.
- Llama 3-8B is cheaper at $0.14 / $0.14 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 8K.
- Llama 3-8B has downloadable open weights; the other is API-only.

## Snapshot

| | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| Provider | Google | Meta |
| Noometry Index | 56.7 | 25.3 |
| Rank | 20 | 338 |
| Context | 1.05M | 8K |
| Input $/M | $2 | $0.14 |
| Output $/M | $12 | $0.14 |
| Weights | Proprietary | Open |

## Coding

- Gemini 3.1 Pro Preview: 42.7 (#88)
- Llama 3-8B: 30.5 (#285)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Coding | 1483 | 1152 |
| SWE-bench Verified | 75.6% | — |
| DeepSWE | 11.7% | — |
| LMArena WebDev | 1446 | — |
| SciCode | 58.9% | — |
| GSO | 22.6% | — |
| WeirdML | 72.1% | — |
| BigCodeBench Instruct | — | 31.9% |
| MirrorCode | 8.9% | — |
| BigCodeBench Complete | — | 36.9% |
| ALE-Bench | 1,161 | — |
| AlgoTune | 2.02 | — |
| HumanEval+ | — | 56.7% |
| MBPP+ | — | 54.8% |

## Agentic & Tool Use

- Gemini 3.1 Pro Preview: 37.7 (#33)
- Llama 3-8B: —

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| 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

- Gemini 3.1 Pro Preview: 71.7 (#9)
- Llama 3-8B: 13.8 (#321)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| Chess Puzzles | 55% | 0% |
| LMArena Hard Prompts | 1484 | 1133 |
| DTBench | 97.1% | 43.9% |
| Epoch Capabilities Index | 154.92 | 116.33 |
| ForecastBench | 59 | 58.6 |
| ARC-AGI-2 | 77.1% | — |
| SimpleBench | 79.6% | — |
| NYT Connections (extended) | 97.4% | — |
| ARC-AGI-1 | 98% | — |
| CritPt | 17.7% | — |
| EnigmaEval | 36.8% | — |
| Thematic Generalization | 79.4% | — |
| EBR-Bench | 14.3% | — |
| Mystery Game Puzzles | 34% | — |
| LMCA | 53.8% | — |
| Adversarial NLI | — | 57.3% |
| WinoGrande | — | 75.7% |

## Math

- Gemini 3.1 Pro Preview: 61.8 (#28)
- Llama 3-8B: 8.3 (#317)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 95.6% | 1.9% |
| LMArena Math | 1485 | 1151 |
| FrontierMath (Tiers 1-3) | 59.6% | — |
| FrontierMath Tier 4 | 26.8% | — |
| MathArena Final-Answer Competitions | 86.5% | — |
| ProofBench | 26% | — |
| MATH Level 5 | — | 6.1% |
| FrontierMath (Feb 2025 set) | 36.9% | — |
| FrontierMath Tier 4 (v1) | 16.7% | — |

## Knowledge

- Gemini 3.1 Pro Preview: 71.8 (#3)
- Llama 3-8B: 7.8 (#303)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| GPQA Diamond | 94.4% | 26.1% |
| LMArena Expert | 1484 | 1113 |
| Humanity's Last Exam | 46.4% | — |
| SimpleQA Verified | 73.5% | — |
| Vectara Hallucination Rate | 10.4% | — |
| ARC (AI2) Challenge | — | 82.8% |
| MMLU | — | 68.8% |
| OpenBookQA | — | 82.6% |
| TriviaQA | — | 67.7% |

## Multimodal

- Gemini 3.1 Pro Preview: 38.1 (#60)
- Llama 3-8B: —

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Vision | 1296 | — |
| Blueprint-Bench 2 | 26.5% | — |
| Furniture Assembly | 26.7% | — |
| LMArena Document | 1444 | — |

## Multilingual

- Gemini 3.1 Pro Preview: 57.1 (#11)
- Llama 3-8B: 31.0 (#256)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Non-English | 1475 | 1098 |
| LMArena Chinese | 1528 | 1076 |
| LMArena French | 1488 | 1158 |
| LMArena German | 1491 | 1104 |
| LMArena Japanese | 1494 | 967 |
| LMArena Korean | 1458 | 1003 |
| LMArena Russian | 1496 | 1109 |
| LMArena Spanish | 1480 | 1172 |

## Instruction Following

- Gemini 3.1 Pro Preview: 77.1 (#31)
- Llama 3-8B: 58.7 (#255)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Instruction Following | 1465 | 1127 |

## Long Context

- Gemini 3.1 Pro Preview: 47.3 (#17)
- Llama 3-8B: 34.2 (#246)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Longer Query | 1482 | 1128 |
| CL-bench | 20.8% | — |
| CL-bench Life | 16.9% | — |

## Writing & Preference

- Gemini 3.1 Pro Preview: 66.3 (#36)
- Llama 3-8B: 37.7 (#251)

| Benchmark | Gemini 3.1 Pro Preview | Llama 3-8B |
|---|---|---|
| LMArena Text | 1480 | 1166 |
| LMArena Creative Writing | 1482 | 1150 |
| LMArena Multi-Turn | 1486 | 1152 |
| EQ-Bench Creative Writing | 1491 | — |
| EQ-Bench 4 | 1142 | — |

## FAQ

### Is Gemini 3.1 Pro Preview better than Llama 3-8B?

Gemini 3.1 Pro Preview is the stronger model overall, scoring 56.7 to 25.3 on the Noometry Index. Llama 3-8B costs 32× 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, Gemini 3.1 Pro Preview or Llama 3-8B?

Llama 3-8B is cheaper. It lists at $0.14 per million input tokens and $0.14 per million output tokens; Gemini 3.1 Pro Preview lists at $2 and $12.

### Is Gemini 3.1 Pro Preview or Llama 3-8B better for coding?

Gemini 3.1 Pro Preview scores higher on coding benchmarks: 42.7 versus 30.5 in the Noometry coding category.

### Which has the bigger context window?

Gemini 3.1 Pro Preview does, with 1.05M tokens against 8K.

### How many benchmarks do Gemini 3.1 Pro Preview and Llama 3-8B share?

23 benchmarks have published results for both models. Gemini 3.1 Pro Preview has 71 scored results on Noometry and Llama 3-8B has 34.