# GPT-5.3 Codex vs Yi-Lightning

> GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 36.5 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-yi-lightning
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.5 to 27.0.

## Snapshot

| | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| Provider | OpenAI | 01.AI |
| Noometry Index | 45.5 | 36.5 |
| Rank | 61 | 206 |
| Context | 400K | — |
| Input $/M | $1.75 | — |
| Output $/M | $14 | — |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Codex: 48.5 (#51)
- Yi-Lightning: 27.0 (#315)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| Aider Polyglot | — | 12.9% |
| LMArena WebDev | 1408 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1313 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 47.8 (#9)
- Yi-Lightning: —

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- Yi-Lightning: 24.9 (#137)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Hard Prompts | — | 1302 |
| Epoch Capabilities Index | 156.84 | — |

## Math

- GPT-5.3 Codex: —
- Yi-Lightning: 33.5 (#173)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Math | — | 1300 |

## Knowledge

- GPT-5.3 Codex: —
- Yi-Lightning: 34.8 (#182)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Expert | — | 1286 |

## Multilingual

- GPT-5.3 Codex: —
- Yi-Lightning: 42.4 (#191)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Non-English | — | 1269 |
| LMArena Chinese | — | 1320 |
| LMArena French | — | 1304 |
| LMArena German | — | 1267 |
| LMArena Japanese | — | 1228 |
| LMArena Korean | — | 1192 |
| LMArena Russian | — | 1255 |
| LMArena Spanish | — | 1315 |

## Instruction Following

- GPT-5.3 Codex: —
- Yi-Lightning: 67.6 (#191)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Instruction Following | — | 1278 |

## Long Context

- GPT-5.3 Codex: —
- Yi-Lightning: 39.4 (#176)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Longer Query | — | 1297 |

## Writing & Preference

- GPT-5.3 Codex: —
- Yi-Lightning: 50.4 (#178)

| Benchmark | GPT-5.3 Codex | Yi-Lightning |
|---|---|---|
| LMArena Text | — | 1302 |
| LMArena Creative Writing | — | 1280 |
| LMArena Multi-Turn | — | 1311 |

## FAQ

### Is GPT-5.3 Codex better than Yi-Lightning?

GPT-5.3 Codex is the stronger model overall, scoring 45.5 to 36.5 on the Noometry Index.

### Is GPT-5.3 Codex or Yi-Lightning better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.5 versus 27.0 in the Noometry coding category.

### How many benchmarks do GPT-5.3 Codex and Yi-Lightning share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and Yi-Lightning has 18.