# GPT-5.3 Codex vs MiMo-V2.6-Flash

> MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 45.8 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-3-codex-vs-mimo-v2-6-flash
- Last updated: 2026-10-11
- Shared benchmarks: 1

## Summary

- They share 1 benchmark with published results for both. GPT-5.3 Codex scores higher in 0 categories and MiMo-V2.6-Flash in 1 category; one gap is clear of the uncertainty.
- The widest gap is in coding, where MiMo-V2.6-Flash leads 53.4 to 48.6.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $1.75 / $14 for GPT-5.3 Codex.
- MiMo-V2.6-Flash accepts more context: 1.05M tokens versus 400K.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 45.8 | 48.5 |
| Rank | 69 | 55 |
| Context | 400K | 1.05M |
| Input $/M | $1.75 | $0.14 |
| Output $/M | $14 | $0.28 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.3 Codex: 48.6 (#56)
- MiMo-V2.6-Flash: 53.4 (#30)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena WebDev | 1409 | 1637 |
| SWE-bench Verified | 74.8% | — |
| SciCode | — | 51.3% |
| WeirdML | 79.3% | — |
| LMArena Coding | — | 1504 |
| ALE-Bench | 1,655 | — |

## Agentic & Tool Use

- GPT-5.3 Codex: 48.0 (#9)
- MiMo-V2.6-Flash: —

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| Terminal-Bench | 78.4% | — |
| METR Time Horizons | 74.5% | — |
| Vending-Bench 2 | 5,940 | — |

## Reasoning

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 36.5 (#66)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| CritPt | — | 12% |
| LMArena Hard Prompts | — | 1482 |
| Epoch Capabilities Index | 156.77 | — |

## Math

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 51.9 (#52)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| ProofBench | — | 63% |
| LMArena Math | — | 1468 |

## Knowledge

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 42.2 (#99)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Expert | — | 1501 |

## Multimodal

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 40.5 (#47)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | — | 1259 |

## Multilingual

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 54.0 (#51)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | — | 1434 |
| LMArena Chinese | — | 1511 |
| LMArena French | — | 1475 |
| LMArena Russian | — | 1409 |
| LMArena Spanish | — | 1456 |

## Instruction Following

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 76.8 (#35)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | — | 1463 |

## Long Context

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 44.8 (#57)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | — | 1463 |

## Writing & Preference

- GPT-5.3 Codex: —
- MiMo-V2.6-Flash: 63.1 (#67)

| Benchmark | GPT-5.3 Codex | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | — | 1455 |
| LMArena Creative Writing | — | 1400 |
| LMArena Multi-Turn | — | 1451 |

## FAQ

### Is GPT-5.3 Codex better than MiMo-V2.6-Flash?

MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 45.8 on the Noometry Index.

### Which is cheaper, GPT-5.3 Codex or MiMo-V2.6-Flash?

MiMo-V2.6-Flash 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-V2.6-Flash better for coding?

MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 48.6 in the Noometry coding category.

### Which has the bigger context window?

MiMo-V2.6-Flash does, with 1.05M tokens against 400K.

### How many benchmarks do GPT-5.3 Codex and MiMo-V2.6-Flash share?

1 benchmark has published results for both models. GPT-5.3 Codex has 8 scored results on Noometry and MiMo-V2.6-Flash has 19.