# GPT-5.5 Instant vs Llama 3.1-70B

> GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.6 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-llama-3-1-70b
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. GPT-5.5 Instant scores higher in 8 categories and Llama 3.1-70B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in writing & preference, where GPT-5.5 Instant leads 61.8 to 35.4.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 68.1% for GPT-5.5 Instant and 3.6% for Llama 3.1-70B.
- Llama 3.1-70B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| Provider | OpenAI | Meta |
| Noometry Index | 42.7 | 29.6 |
| Rank | 110 | 308 |
| Context | — | 128K |
| Input $/M | — | $0.40 |
| Output $/M | — | $0.40 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 44.3 (#74)
- Llama 3.1-70B: 30.3 (#296)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Coding | 1433 | 1260 |
| SciCode | 48.6% | — |
| WeirdML | — | 9% |
| BigCodeBench Instruct | — | 46.1% |
| BigCodeBench Complete | — | 54.8% |

## Agentic & Tool Use

- GPT-5.5 Instant: —
- Llama 3.1-70B: 25.1 (#112)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| TheAgentCompany | — | 6.9% |
| BALROG | — | 27.9% |

## Reasoning

- GPT-5.5 Instant: 24.9 (#155)
- Llama 3.1-70B: 21.6 (#220)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Hard Prompts | 1426 | 1241 |
| Epoch Capabilities Index | 142.52 | 125.92 |
| CritPt | 0% | — |
| Chess Puzzles | 12% | — |
| DTBench | — | 60% |
| LMCA | — | 14.8% |

## Math

- GPT-5.5 Instant: 26.5 (#259)
- Llama 3.1-70B: 13.5 (#304)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 68.1% | 3.6% |
| LMArena Math | 1420 | 1252 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| Omni-MATH | — | 21% |
| MATH Level 5 | — | 36.7% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#74)
- Llama 3.1-70B: 24.2 (#269)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| GPQA Diamond | 82.5% | 44.2% |
| LMArena Expert | 1409 | 1209 |
| MMLU-Pro | — | 65.3% |
| GPQA (HELM) | — | 42.6% |
| MMLU | — | 80.1% |

## Multimodal

- GPT-5.5 Instant: 40.0 (#52)
- Llama 3.1-70B: —

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 52.8 (#80)
- Llama 3.1-70B: 38.8 (#225)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Non-English | 1417 | 1219 |
| LMArena Chinese | 1456 | 1215 |
| LMArena French | 1428 | 1261 |
| LMArena German | 1411 | 1222 |
| LMArena Japanese | 1408 | 1132 |
| LMArena Korean | 1392 | 1140 |
| LMArena Russian | 1431 | 1234 |
| LMArena Spanish | 1429 | 1253 |

## Instruction Following

- GPT-5.5 Instant: 74.2 (#100)
- Llama 3.1-70B: 65.3 (#223)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Instruction Following | 1406 | 1231 |
| IFEval | — | 82.1% |

## Long Context

- GPT-5.5 Instant: 43.4 (#96)
- Llama 3.1-70B: 37.6 (#214)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Longer Query | 1422 | 1241 |

## Writing & Preference

- GPT-5.5 Instant: 61.8 (#85)
- Llama 3.1-70B: 35.4 (#267)

| Benchmark | GPT-5.5 Instant | Llama 3.1-70B |
|---|---|---|
| LMArena Text | 1419 | 1261 |
| LMArena Creative Writing | 1419 | 1232 |
| LMArena Multi-Turn | 1433 | 1256 |
| EQ-Bench Creative Writing | — | 784 |
| WildBench | — | 75.8% |

## FAQ

### Is GPT-5.5 Instant better than Llama 3.1-70B?

GPT-5.5 Instant is the stronger model overall, scoring 42.7 to 29.6 on the Noometry Index.

### Is GPT-5.5 Instant or Llama 3.1-70B better for coding?

GPT-5.5 Instant scores higher on coding benchmarks: 44.3 versus 30.3 in the Noometry coding category.

### How many benchmarks do GPT-5.5 Instant and Llama 3.1-70B share?

20 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and Llama 3.1-70B has 35.