# GPT-5.5 Instant vs Llama 3-8B

> GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 25.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-llama-3-8b
- Last updated: 2026-10-10
- Shared benchmarks: 21

## Summary

- They share 21 benchmarks with published results for both. GPT-5.5 Instant 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 GPT-5.5 Instant leads 48.9 to 7.8.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 1.9% for Llama 3-8B.
- Llama 3-8B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.7 | 25.5 |
| Rank | 110 | 344 |
| Context | — | — |
| Input $/M | — | — |
| Output $/M | — | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 44.3 (#74)
- Llama 3-8B: 31.0 (#289)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Coding | 1433 | 1152 |
| SciCode | 48.6% | — |
| BigCodeBench Instruct | — | 31.9% |
| BigCodeBench Complete | — | 36.9% |
| HumanEval+ | — | 56.7% |
| MBPP+ | — | 54.8% |

## Reasoning

- GPT-5.5 Instant: 24.9 (#155)
- Llama 3-8B: 14.3 (#326)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| Chess Puzzles | 12% | 0% |
| LMArena Hard Prompts | 1426 | 1133 |
| Epoch Capabilities Index | 142.52 | 116.45 |
| CritPt | 0% | — |
| DTBench | — | 43.9% |
| Adversarial NLI | — | 57.3% |
| ForecastBench | — | 58.6 |
| WinoGrande | — | 75.7% |

## Math

- GPT-5.5 Instant: 26.5 (#259)
- Llama 3-8B: 8.8 (#323)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.1% | 1.9% |
| LMArena Math | 1420 | 1151 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| MATH Level 5 | — | 6.1% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#74)
- Llama 3-8B: 7.8 (#308)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| GPQA Diamond | 82.5% | 26.1% |
| LMArena Expert | 1409 | 1113 |
| ARC (AI2) Challenge | — | 82.8% |
| MMLU | — | 68.8% |
| OpenBookQA | — | 82.6% |
| TriviaQA | — | 67.7% |

## Multimodal

- GPT-5.5 Instant: 40.0 (#52)
- Llama 3-8B: —

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 52.8 (#80)
- Llama 3-8B: 30.8 (#261)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Non-English | 1417 | 1098 |
| LMArena Chinese | 1456 | 1076 |
| LMArena French | 1428 | 1159 |
| LMArena German | 1411 | 1104 |
| LMArena Japanese | 1408 | 967 |
| LMArena Korean | 1392 | 1004 |
| LMArena Russian | 1431 | 1109 |
| LMArena Spanish | 1429 | 1173 |

## Instruction Following

- GPT-5.5 Instant: 74.2 (#100)
- Llama 3-8B: 58.4 (#260)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Instruction Following | 1406 | 1127 |

## Long Context

- GPT-5.5 Instant: 43.4 (#96)
- Llama 3-8B: 34.2 (#251)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Longer Query | 1422 | 1128 |

## Writing & Preference

- GPT-5.5 Instant: 61.8 (#85)
- Llama 3-8B: 37.5 (#256)

| Benchmark | GPT-5.5 Instant | Llama 3-8B |
|---|---|---|
| LMArena Text | 1419 | 1166 |
| LMArena Creative Writing | 1419 | 1150 |
| LMArena Multi-Turn | 1433 | 1152 |

## FAQ

### Is GPT-5.5 Instant better than Llama 3-8B?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 25.5 on the Noometry Index.

### Is GPT-5.5 Instant or Llama 3-8B better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 31.0 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Llama 3-8B share?

21 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Llama 3-8B has 34.