# GPT-5-Codex vs Yi-34B

> GPT-5-Codex is the stronger model overall, scoring 37.3 to 27.4 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-codex-vs-yi-34b
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5-Codex leads 41.9 to 31.8.
- Yi-34B has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5-Codex | Yi-34B |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 37.3 | 27.4 |
| Rank | 190 | 325 |
| Context | 400K | — |
| Input $/M | $1.25 | — |
| Output $/M | $10 | — |
| Weights | Proprietary | Open |

## Coding

- GPT-5-Codex: 41.9 (#100)
- Yi-34B: 31.8 (#269)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| WeirdML | 54.5% | — |
| LMArena Coding | — | 1112 |

## Agentic & Tool Use

- GPT-5-Codex: 30.8 (#66)
- Yi-34B: —

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| Terminal-Bench | 44.3% | — |

## Reasoning

- GPT-5-Codex: 30.0 (#80)
- Yi-34B: 20.3 (#222)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| Kagi LLM Benchmark | 70.3% | — |
| LMArena Hard Prompts | — | 1104 |
| BIG-Bench Hard | — | 71.7% |
| Epoch Capabilities Index | — | 117.28 |

## Math

- GPT-5-Codex: —
- Yi-34B: 19.8 (#277)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| LMArena Math | — | 1114 |
| MATH Level 5 | — | 5.1% |
| GSM8K | — | 76% |

## Knowledge

- GPT-5-Codex: —
- Yi-34B: 7.5 (#304)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| GPQA Diamond | — | 14.7% |
| LMArena Expert | — | 1061 |
| MMLU | — | 76.3% |

## Multilingual

- GPT-5-Codex: —
- Yi-34B: 29.9 (#259)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| LMArena Non-English | — | 1079 |
| LMArena Chinese | — | 1175 |
| LMArena French | — | 1080 |
| LMArena German | — | 1042 |
| LMArena Japanese | — | 993 |
| LMArena Korean | — | 959 |
| LMArena Russian | — | 1050 |
| LMArena Spanish | — | 1070 |

## Instruction Following

- GPT-5-Codex: —
- Yi-34B: 56.4 (#269)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| LMArena Instruction Following | — | 1091 |

## Long Context

- GPT-5-Codex: —
- Yi-34B: 33.2 (#259)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| LMArena Longer Query | — | 1094 |

## Writing & Preference

- GPT-5-Codex: —
- Yi-34B: 34.3 (#268)

| Benchmark | GPT-5-Codex | Yi-34B |
|---|---|---|
| LMArena Text | — | 1129 |
| LMArena Creative Writing | — | 1108 |
| LMArena Multi-Turn | — | 1113 |

## FAQ

### Is GPT-5-Codex better than Yi-34B?

GPT-5-Codex is the stronger model overall, scoring 37.3 to 27.4 on the Noometry Index.

### Is GPT-5-Codex or Yi-34B better for coding?

GPT-5-Codex scores higher on coding benchmarks: 41.9 versus 31.8 in the Noometry coding category.

### How many benchmarks do GPT-5-Codex and Yi-34B share?

0 benchmarks have published results for both models. GPT-5-Codex has 3 scored results on Noometry and Yi-34B has 23.