# Kimi K2.5 vs Llama 3.1-8B

> Kimi K2.5 is the stronger model overall, scoring 48.1 to 23.0 on the Noometry Index. Llama 3.1-8B costs 16× less per token, which makes it the better buy when Kimi K2.5's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/kimi-k2-5-vs-llama-3-1-8b
- Last updated: 2026-10-10
- Shared benchmarks: 25

## Summary

- They share 25 benchmarks with published results for both. Kimi K2.5 scores higher in 9 categories and Llama 3.1-8B in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where Kimi K2.5 leads 53.6 to 8.0.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 92.2% for Kimi K2.5 and 1.7% for Llama 3.1-8B.
- Llama 3.1-8B is cheaper at $0.05 / $0.08 per million input/output tokens, against $0.45 / $2.25 for Kimi K2.5.
- Kimi K2.5 accepts more context: 262K tokens versus 128K.

## Snapshot

| | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| Provider | Moonshot AI | Meta |
| Noometry Index | 48.1 | 23.0 |
| Rank | 57 | 352 |
| Context | 262K | 128K |
| Input $/M | $0.45 | $0.05 |
| Output $/M | $2.25 | $0.08 |
| Weights | Open | Open |

## Coding

- Kimi K2.5: 48.8 (#53)
- Llama 3.1-8B: 20.2 (#340)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| SciCode | 49% | 13.2% |
| WeirdML | 45.6% | 1.7% |
| LMArena Coding | 1474 | 1195 |
| SWE-bench Verified | 73.8% | — |
| SWE-bench Verified (bash only) | 70.8% | — |
| LMArena WebDev | 1437 | — |
| SWE-bench Multilingual | 67.3% | — |
| BigCodeBench Instruct | — | 32.8% |
| BigCodeBench Complete | — | 40.5% |
| ALE-Bench | 821.65 | — |
| HumanEval+ | — | 62.8% |
| MBPP+ | — | 55.6% |

## Agentic & Tool Use

- Kimi K2.5: 34.2 (#48)
- Llama 3.1-8B: 22.5 (#131)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| Terminal-Bench | 43.2% | — |
| Berkeley Function Calling Leaderboard | — | 25.8% |
| OSWorld | 63.3% | — |
| BALROG | — | 15.1% |
| Vending-Bench 2 | 1,198 | — |

## Reasoning

- Kimi K2.5: 31.2 (#80)
- Llama 3.1-8B: 14.9 (#321)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| CritPt | 3.1% | 0% |
| Chess Puzzles | 12% | 0% |
| LMArena Hard Prompts | 1453 | 1175 |
| Epoch Capabilities Index | 148.03 | 116.57 |
| ARC-AGI-2 | 11.8% | — |
| SimpleBench | 46.8% | — |
| Kagi LLM Benchmark | 78.5% | — |
| NYT Connections (extended) | 69.9% | — |
| ARC-AGI-1 | 65.3% | — |
| EnigmaEval | 3.4% | — |
| Thematic Generalization | 69.4% | — |
| DTBench | — | 50.9% |
| LMCA | — | 5.4% |
| PIQA | — | 81.2% |

## Math

- Kimi K2.5: 51.8 (#53)
- Llama 3.1-8B: 10.2 (#317)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 92.2% | 1.7% |
| LMArena Math | 1470 | 1179 |
| MathArena Final-Answer Competitions | 62.3% | — |
| Omni-MATH | — | 13.7% |
| MATH Level 5 | — | 22.9% |
| FrontierMath (Feb 2025 set) | 27.9% | — |
| FrontierMath Tier 4 (v1) | 4.2% | — |
| GSM8K | — | 82.4% |

## Knowledge

- Kimi K2.5: 53.6 (#56)
- Llama 3.1-8B: 8.0 (#307)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| GPQA Diamond | 87.6% | 27% |
| LMArena Expert | 1466 | 1144 |
| Humanity's Last Exam | 24.4% | — |
| SimpleQA Verified | 34.3% | — |
| MMLU-Pro | — | 40.6% |
| Vectara Hallucination Rate | 14.2% | — |
| GPQA (HELM) | — | 24.7% |
| BoolQ | — | 82.8% |
| MMLU | — | 56.1% |

## Multimodal

- Kimi K2.5: 41.1 (#39)
- Llama 3.1-8B: —

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| LMArena Vision | 1269 | — |
| LMArena Document | 1430 | — |

## Multilingual

- Kimi K2.5: 53.9 (#53)
- Llama 3.1-8B: 34.0 (#249)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| LMArena Non-English | 1433 | 1148 |
| LMArena Chinese | 1495 | 1151 |
| LMArena French | 1454 | 1177 |
| LMArena German | 1441 | 1144 |
| LMArena Japanese | 1421 | 1061 |
| LMArena Korean | 1410 | 1053 |
| LMArena Russian | 1435 | 1158 |
| LMArena Spanish | 1450 | 1169 |

## Instruction Following

- Kimi K2.5: 75.3 (#64)
- Llama 3.1-8B: 58.9 (#258)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| LMArena Instruction Following | 1431 | 1159 |
| IFEval | — | 74.3% |

## Long Context

- Kimi K2.5: 52.1 (#7)
- Llama 3.1-8B: 35.8 (#238)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| LMArena Longer Query | 1445 | 1182 |
| Fiction.LiveBench | 86.1% | — |
| CL-bench | 19.3% | — |
| CL-bench Life | 13.2% | — |

## Writing & Preference

- Kimi K2.5: 65.1 (#53)
- Llama 3.1-8B: 29.7 (#290)

| Benchmark | Kimi K2.5 | Llama 3.1-8B |
|---|---|---|
| LMArena Text | 1445 | 1187 |
| LMArena Creative Writing | 1423 | 1154 |
| EQ-Bench Creative Writing | 1579 | 713 |
| LMArena Multi-Turn | 1444 | 1172 |
| WildBench | — | 68.7% |

## FAQ

### Is Kimi K2.5 better than Llama 3.1-8B?

Kimi K2.5 is the stronger model overall, scoring 48.1 to 23.0 on the Noometry Index. Llama 3.1-8B costs 16× less per token, which makes it the better buy when Kimi K2.5's lead doesn't matter for your workload.

### Which is cheaper, Kimi K2.5 or Llama 3.1-8B?

Llama 3.1-8B is cheaper. It lists at $0.05 per million input tokens and $0.08 per million output tokens; Kimi K2.5 lists at $0.45 and $2.25.

### Is Kimi K2.5 or Llama 3.1-8B better for coding?

Kimi K2.5 scores higher on coding benchmarks: 48.8 versus 20.2 in the Noometry coding category.

### Which has the bigger context window?

Kimi K2.5 does, with 262K tokens against 128K.

### How many benchmarks do Kimi K2.5 and Llama 3.1-8B share?

25 benchmarks have published results for both models. Kimi K2.5 has 51 scored results on Noometry and Llama 3.1-8B has 43.