# GPT-5.1 vs Yi-34B

> GPT-5.1 is the stronger model overall, scoring 48.8 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-vs-yi-34b
- Last updated: 2026-10-10
- Shared benchmarks: 19

## Summary

- They share 19 benchmarks with published results for both. GPT-5.1 scores higher in 8 categories and Yi-34B in 0 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where GPT-5.1 leads 50.5 to 7.5.
- The biggest single-benchmark swing is GPQA Diamond: 87.6% for GPT-5.1 and 14.7% for Yi-34B.
- Yi-34B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1 | Yi-34B |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 48.8 | 27.4 |
| Rank | 47 | 325 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1: 46.9 (#59)
- Yi-34B: 31.8 (#269)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Coding | 1454 | 1112 |
| SWE-bench Verified | 68% | — |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena WebDev | 1395 | — |
| SciCode | 43.3% | — |
| GSO | 13.7% | — |
| WeirdML | 60.8% | — |
| LiveBench Coding | 72.5% | — |
| ALE-Bench | 1,192 | — |

## Agentic & Tool Use

- GPT-5.1: 32.5 (#55)
- Yi-34B: —

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| Terminal-Bench | 47.6% | — |
| DeepResearch Bench | 42.8% | — |
| LMArena Search | 1199 | — |
| Vending-Bench 2 | 1,473 | — |

## Reasoning

- GPT-5.1: 39.9 (#50)
- Yi-34B: 20.3 (#222)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Hard Prompts | 1457 | 1104 |
| Epoch Capabilities Index | 149.66 | 117.28 |
| ARC-AGI-2 | 17.6% | — |
| SimpleBench | 53.2% | — |
| ARC-AGI-1 | 72.8% | — |
| CritPt | 4.9% | — |
| Chess Puzzles | 32% | — |
| EnigmaEval | 11.2% | — |
| LiveBench Reasoning | 95.8% | — |
| Mystery Game Puzzles | 19% | — |
| DTBench | 90.1% | — |
| LiveBench Data Analysis | 72.1% | — |
| LMCA | 43.9% | — |
| BIG-Bench Hard | — | 71.7% |
| ForecastBench | 58.1 | — |
| LiveBench | 78.8% | — |

## Math

- GPT-5.1: 50.3 (#45)
- Yi-34B: 19.8 (#277)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Math | 1446 | 1114 |
| OTIS Mock AIME 2024-2025 | 88.6% | — |
| Omni-MATH | 46.4% | — |
| LiveBench Math | 94.5% | — |
| MATH Level 5 | — | 5.1% |
| FrontierMath (Feb 2025 set) | 31% | — |
| FrontierMath Tier 4 (v1) | 12.5% | — |
| GSM8K | — | 76% |

## Knowledge

- GPT-5.1: 50.5 (#65)
- Yi-34B: 7.5 (#304)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| GPQA Diamond | 87.6% | 14.7% |
| LMArena Expert | 1470 | 1061 |
| Humanity's Last Exam | 23.7% | — |
| SimpleQA Verified | 48% | — |
| MMLU-Pro | 57.9% | — |
| Vectara Hallucination Rate | 10.9% | — |
| GPQA (HELM) | 44.2% | — |
| MMLU | — | 76.3% |

## Multimodal

- GPT-5.1: 44.0 (#17)
- Yi-34B: —

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Vision | 1250 | — |
| VPCT | 58.7% | — |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.1: 54.0 (#51)
- Yi-34B: 29.9 (#259)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Non-English | 1431 | 1079 |
| LMArena Chinese | 1495 | 1175 |
| LMArena French | 1451 | 1080 |
| LMArena German | 1439 | 1042 |
| LMArena Japanese | 1453 | 993 |
| LMArena Korean | 1401 | 959 |
| LMArena Russian | 1435 | 1050 |
| LMArena Spanish | 1430 | 1070 |

## Instruction Following

- GPT-5.1: 84.0 (#1)
- Yi-34B: 56.4 (#269)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Instruction Following | 1442 | 1091 |
| LiveBench Instruction Following | 93.3% | — |
| IFEval | 93.5% | — |

## Long Context

- GPT-5.1: 47.6 (#14)
- Yi-34B: 33.2 (#259)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Longer Query | 1448 | 1094 |
| CL-bench | 23.7% | — |
| CL-bench Life | 17.3% | — |

## Writing & Preference

- GPT-5.1: 64.7 (#53)
- Yi-34B: 34.3 (#268)

| Benchmark | GPT-5.1 | Yi-34B |
|---|---|---|
| LMArena Text | 1443 | 1129 |
| LMArena Creative Writing | 1427 | 1108 |
| LMArena Multi-Turn | 1449 | 1113 |
| WildBench | 86.3% | — |
| LiveBench Language | 80.2% | — |

## FAQ

### Is GPT-5.1 better than Yi-34B?

GPT-5.1 is the stronger model overall, scoring 48.8 to 27.4 on the Noometry Index.

### Is GPT-5.1 or Yi-34B better for coding?

GPT-5.1 scores higher on coding benchmarks: 46.9 versus 31.8 in the Noometry coding category.

### How many benchmarks do GPT-5.1 and Yi-34B share?

19 benchmarks have published results for both models. GPT-5.1 has 63 scored results on Noometry and Yi-34B has 23.