# GPT-5.1-Codex-mini vs MiMo-V2.6-Pro

> MiMo-V2.6-Pro has enough public results to be ranked (#49); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.

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

## Summary

- They share 1 benchmark with published results for both. GPT-5.1-Codex-mini scores higher in 1 category and MiMo-V2.6-Pro in 1 category; 2 gaps are clear of the uncertainty.
- The widest gap is in coding, where MiMo-V2.6-Pro leads 55.5 to 31.6.
- MiMo-V2.6-Pro is cheaper at $0.43 / $0.87 per million input/output tokens, against $0.25 / $2 for GPT-5.1-Codex-mini.
- MiMo-V2.6-Pro accepts more context: 1.05M tokens versus 400K.
- MiMo-V2.6-Pro has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 37.3 | 50.3 |
| Rank | — | 49 |
| Context | 400K | 1.05M |
| Input $/M | $0.25 | $0.43 |
| Output $/M | $2 | $0.87 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.1-Codex-mini: 31.6
- MiMo-V2.6-Pro: 55.5 (#23)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena WebDev | 1244 | 1629 |
| SciCode | — | 60.9% |
| LMArena Coding | — | 1534 |
| ALE-Bench | — | 1,158 |

## Agentic & Tool Use

- GPT-5.1-Codex-mini: 38.5
- MiMo-V2.6-Pro: 37.5 (#35)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| Terminal-Bench | 61.6% | — |
| APEX-Agents | — | 59.5% |

## Reasoning

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 43.1 (#50)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| CritPt | — | 26.6% |
| LMArena Hard Prompts | — | 1512 |

## Math

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 54.5 (#45)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| ProofBench | — | 70% |
| LMArena Math | — | 1494 |

## Knowledge

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 43.5 (#92)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Expert | — | 1543 |

## Multimodal

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 40.8 (#43)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Vision | — | 1264 |

## Multilingual

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 56.9 (#14)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Non-English | — | 1474 |
| LMArena Chinese | — | 1529 |
| LMArena Russian | — | 1480 |

## Instruction Following

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 78.2 (#12)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Instruction Following | — | 1493 |

## Long Context

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 46.0 (#27)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Longer Query | — | 1501 |

## Writing & Preference

- GPT-5.1-Codex-mini: —
- MiMo-V2.6-Pro: 66.8 (#33)

| Benchmark | GPT-5.1-Codex-mini | MiMo-V2.6-Pro |
|---|---|---|
| LMArena Text | — | 1492 |
| LMArena Creative Writing | — | 1468 |
| LMArena Multi-Turn | — | 1464 |

## FAQ

### Is GPT-5.1-Codex-mini better than MiMo-V2.6-Pro?

MiMo-V2.6-Pro has enough public results to be ranked (#49); GPT-5.1-Codex-mini does not yet, so treat this comparison as directional.

### Which is cheaper, GPT-5.1-Codex-mini or MiMo-V2.6-Pro?

MiMo-V2.6-Pro is cheaper. It lists at $0.43 per million input tokens and $0.87 per million output tokens; GPT-5.1-Codex-mini lists at $0.25 and $2.

### Is GPT-5.1-Codex-mini or MiMo-V2.6-Pro better for coding?

MiMo-V2.6-Pro scores higher on coding benchmarks: 55.5 versus 31.6 in the Noometry coding category.

### Which has the bigger context window?

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

### How many benchmarks do GPT-5.1-Codex-mini and MiMo-V2.6-Pro share?

1 benchmark has published results for both models. GPT-5.1-Codex-mini has 2 scored results on Noometry and MiMo-V2.6-Pro has 19.