# GPT-5.1-Codex vs MiMo-V2-Pro

> MiMo-V2-Pro is the stronger model overall, scoring 42.4 to 38.2 on the Noometry Index.

- Canonical page: https://noometry.com/compare/gpt-5-1-codex-vs-mimo-v2-pro
- Last updated: 2026-10-10
- Shared benchmarks: 2

## Summary

- They share 2 benchmarks with published results for both. GPT-5.1-Codex scores higher in 0 categories and MiMo-V2-Pro in 2 categories; 2 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2-Pro leads 36.7 to 29.3.
- MiMo-V2-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $1.25 / $10 for GPT-5.1-Codex.
- MiMo-V2-Pro accepts more context: 1.05M tokens versus 400K.

## Snapshot

| | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 38.2 | 42.4 |
| Rank | 178 | 102 |
| Context | 400K | 1.05M |
| Input $/M | $1.25 | $0.43 |
| Output $/M | $10 | $0.87 |
| Weights | Proprietary | Proprietary |

## Coding

- GPT-5.1-Codex: 41.7 (#107)
- MiMo-V2-Pro: 43.4 (#76)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| LMArena WebDev | 1337 | 1433 |
| ALE-Bench | 1,245 | 785.17 |
| SWE-bench Verified (bash only) | 66% | — |
| LMArena Coding | — | 1476 |

## Agentic & Tool Use

- GPT-5.1-Codex: 37.8 (#32)
- MiMo-V2-Pro: —

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| Terminal-Bench | 60.4% | — |
| METR Time Horizons | 70.8% | — |

## Reasoning

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 21.3 (#200)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| NYT Connections (extended) | — | 25.8% |
| Thematic Generalization | — | 45.9% |
| LMArena Hard Prompts | — | 1457 |

## Math

- GPT-5.1-Codex: 29.3 (#218)
- MiMo-V2-Pro: 36.7 (#104)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| ProofBench | 9% | — |
| LMArena Math | — | 1447 |

## Knowledge

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 40.8 (#106)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| LMArena Expert | — | 1479 |

## Multilingual

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 52.9 (#77)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| LMArena Non-English | — | 1416 |
| LMArena Chinese | — | 1455 |
| LMArena French | — | 1470 |
| LMArena German | — | 1417 |
| LMArena Japanese | — | 1366 |
| LMArena Korean | — | 1401 |
| LMArena Russian | — | 1427 |
| LMArena Spanish | — | 1458 |

## Instruction Following

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 76.2 (#46)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| LMArena Instruction Following | — | 1444 |

## Long Context

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 41.5 (#133)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| CL-bench | — | 15.7% |
| CL-bench Life | — | 6.9% |
| LMArena Longer Query | — | 1455 |

## Writing & Preference

- GPT-5.1-Codex: —
- MiMo-V2-Pro: 62.9 (#67)

| Benchmark | GPT-5.1-Codex | MiMo-V2-Pro |
|---|---|---|
| LMArena Text | — | 1436 |
| LMArena Creative Writing | — | 1415 |
| LMArena Multi-Turn | — | 1456 |

## FAQ

### Is GPT-5.1-Codex better than MiMo-V2-Pro?

MiMo-V2-Pro is the stronger model overall, scoring 42.4 to 38.2 on the Noometry Index.

### Which is cheaper, GPT-5.1-Codex or MiMo-V2-Pro?

MiMo-V2-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; GPT-5.1-Codex lists at $1.25 and $10.

### Is GPT-5.1-Codex or MiMo-V2-Pro better for coding?

MiMo-V2-Pro scores higher on coding benchmarks: 43.4 versus 41.7 in the Noometry coding category.

### Which has the bigger context window?

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

### How many benchmarks do GPT-5.1-Codex and MiMo-V2-Pro share?

2 benchmarks have published results for both models. GPT-5.1-Codex has 6 scored results on Noometry and MiMo-V2-Pro has 23.