# GPT-5.3 Codex vs MiMo-V2-Omni

> GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.6 on the Noometry Index. MiMo-V2-Omni costs 27× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-mimo-v2-omni
- Last updated: 2026-10-10
- Shared benchmarks: 0

## Summary

- The widest gap is in coding, where GPT-5.3 Codex leads 48.6 to 43.3.
- MiMo-V2-Omni is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- GPT-5.3 Codex accepts more context: 400K tokens versus 262K.

## Snapshot

| | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 45.8 | 43.6 |
| Rank | 69 | 88 |
| Context | 400K | 262K |
| Input $/M | $1.75 | $0.14 |
| Output $/M | $14 | $0.28 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- MiMo-V2-Omni: 43.3 (#89)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| SWE-bench Verified | 74.8% | — |
| LMArena WebDev | 1409 | — |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1466 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- MiMo-V2-Omni: —

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 29.7 (#88)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Hard Prompts | — | 1445 |
| Epoch Capabilities Index | 156.77 | — |

## Math

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 39.1 (#115)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Math | — | 1430 |

## Knowledge

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 40.5 (#118)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Expert | — | 1449 |

## Multimodal

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 38.6 (#63)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Vision | — | 1228 |

## Multilingual

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 51.8 (#102)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Non-English | — | 1404 |
| LMArena Chinese | — | 1465 |
| LMArena French | — | 1447 |
| LMArena German | — | 1399 |
| LMArena Japanese | — | 1317 |
| LMArena Korean | — | 1355 |
| LMArena Russian | — | 1412 |
| LMArena Spanish | — | 1434 |

## Instruction Following

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 75.2 (#66)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Instruction Following | — | 1428 |

## Long Context

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 44.1 (#76)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Longer Query | — | 1442 |

## Writing & Preference

- GPT-5.3 Codex: —
- MiMo-V2-Omni: 61.4 (#87)

| Benchmark | GPT-5.3 Codex | MiMo-V2-Omni |
|---|---|---|
| LMArena Text | — | 1423 |
| LMArena Creative Writing | — | 1392 |
| LMArena Multi-Turn | — | 1445 |

## FAQ

### Is GPT-5.3 Codex better than MiMo-V2-Omni?

GPT-5.3 Codex is the stronger model overall, scoring 45.8 to 43.6 on the Noometry Index. MiMo-V2-Omni costs 27× less per token, which makes it the better buy when GPT-5.3 Codex's lead doesn't matter for your workload.

### Which is cheaper, GPT-5.3 Codex or MiMo-V2-Omni?

MiMo-V2-Omni is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; GPT-5.3 Codex lists at $1.75 and $14.

### Is GPT-5.3 Codex or MiMo-V2-Omni better for coding?

GPT-5.3 Codex scores higher on coding benchmarks: 48.6 versus 43.3 in the Noometry coding category.

### Which has the bigger context window?

GPT-5.3 Codex does, with 400K tokens against 262K.

### How many benchmarks do GPT-5.3 Codex and MiMo-V2-Omni share?

0 benchmarks have published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and MiMo-V2-Omni has 18.