# Grok 3 vs Llama 3.1-8B

> Grok 3 is the stronger model overall, scoring 39.6 to 22.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/grok-3-vs-llama-3-1-8b
- Last updated: 2026-10-10
- Shared benchmarks: 29

## Summary

- They share 29 benchmarks with published results for both. Grok 3 scores higher in 8 categories and Llama 3.1-8B in 1 category; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Grok 3 leads 46.0 to 8.0.
- The biggest single-benchmark swing is MATH Level 5: 88.7% for Grok 3 and 22.9% for Llama 3.1-8B.
- Llama 3.1-8B has downloadable open weights; the other is API-only.

## Snapshot

| | Grok 3 | Llama 3.1-8B |
|---|---|---|
| Provider | xAI | Meta |
| Noometry Index | 39.6 | 22.8 |
| Rank | 150 | 347 |
| Context | — | 128K |
| Input $/M | — | $0.05 |
| Output $/M | — | $0.08 |
| Weights | Proprietary | Open |

## Coding

- Grok 3: 41.5 (#113)
- Llama 3.1-8B: 19.9 (#335)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| WeirdML | 37.2% | 1.7% |
| LMArena Coding | 1432 | 1195 |
| Aider Polyglot | 53.3% | — |
| SciCode | — | 13.2% |
| BigCodeBench Instruct | — | 32.8% |
| BigCodeBench Complete | — | 40.5% |
| HumanEval+ | — | 62.8% |
| MBPP+ | — | 55.6% |

## Agentic & Tool Use

- Grok 3: 30.2 (#69)
- Llama 3.1-8B: 22.3 (#123)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| BALROG | 29.5% | 15.1% |
| Berkeley Function Calling Leaderboard | — | 25.8% |

## Reasoning

- Grok 3: 13.8 (#322)
- Llama 3.1-8B: 14.5 (#316)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| LMArena Hard Prompts | 1433 | 1175 |
| Epoch Capabilities Index | 138.34 | 116.48 |
| ARC-AGI-2 | 0% | — |
| SimpleBench | 36.1% | — |
| Kagi LLM Benchmark | 61.3% | — |
| ARC-AGI-1 | 5.5% | — |
| CritPt | — | 0% |
| Chess Puzzles | — | 0% |
| DTBench | — | 50.9% |
| LMCA | — | 5.4% |
| PIQA | — | 81.2% |

## Math

- Grok 3: 36.2 (#122)
- Llama 3.1-8B: 9.5 (#311)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 55.6% | 1.7% |
| Omni-MATH | 46.4% | 13.7% |
| LMArena Math | 1390 | 1179 |
| MATH Level 5 | 88.7% | 22.9% |
| FrontierMath (Feb 2025 set) | 3.8% | — |
| FrontierMath Tier 4 (v1) | 0% | — |
| GSM8K | — | 82.4% |

## Knowledge

- Grok 3: 46.0 (#76)
- Llama 3.1-8B: 8.0 (#302)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| GPQA Diamond | 75.8% | 27% |
| MMLU-Pro | 78.8% | 40.6% |
| GPQA (HELM) | 65% | 24.7% |
| LMArena Expert | 1420 | 1144 |
| Confabulations | 14.2% | — |
| Vectara Hallucination Rate | 5.8% | — |
| BoolQ | — | 82.8% |
| MMLU | — | 56.1% |

## Multilingual

- Grok 3: 52.5 (#81)
- Llama 3.1-8B: 34.2 (#244)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| LMArena Non-English | 1411 | 1148 |
| LMArena Chinese | 1448 | 1151 |
| LMArena French | 1460 | 1176 |
| LMArena German | 1431 | 1144 |
| LMArena Japanese | 1389 | 1061 |
| LMArena Korean | 1374 | 1053 |
| LMArena Russian | 1416 | 1158 |
| LMArena Spanish | 1417 | 1169 |

## Instruction Following

- Grok 3: 75.2 (#69)
- Llama 3.1-8B: 59.1 (#253)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| IFEval | 88.4% | 74.3% |
| LMArena Instruction Following | 1409 | 1159 |

## Long Context

- Grok 3: 38.7 (#187)
- Llama 3.1-8B: 35.8 (#233)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| LMArena Longer Query | 1439 | 1182 |
| Fiction.LiveBench | 58.3% | — |

## Writing & Preference

- Grok 3: 56.0 (#136)
- Llama 3.1-8B: 29.9 (#285)

| Benchmark | Grok 3 | Llama 3.1-8B |
|---|---|---|
| LMArena Text | 1426 | 1187 |
| LMArena Creative Writing | 1414 | 1154 |
| EQ-Bench Creative Writing | 1186 | 713 |
| WildBench | 84.9% | 68.7% |
| LMArena Multi-Turn | 1424 | 1172 |
| Short-Story Creative Writing | 76.4% | — |

## FAQ

### Is Grok 3 better than Llama 3.1-8B?

Grok 3 is the stronger model overall, scoring 39.6 to 22.8 on the Noometry Index.

### Is Grok 3 or Llama 3.1-8B better for coding?

Grok 3 scores higher on coding benchmarks: 41.5 versus 19.9 in the Noometry coding category.

### How many benchmarks do Grok 3 and Llama 3.1-8B share?

29 benchmarks have published results for both models. Grok 3 has 40 scored results on Noometry and Llama 3.1-8B has 43.