# GPT-5.5 Instant vs MiMo-V2.5

> GPT-5.5 Instant and MiMo-V2.5 score almost the same on the Noometry Index (42.5 vs 43.0), so choose on price, context window or the category you care about most.

- Canonical page: https://noometry.com/compare/gpt-5-5-instant-vs-mimo-v2-5
- Last updated: 2026-10-10
- Shared benchmarks: 20

## Summary

- They share 20 benchmarks with published results for both. GPT-5.5 Instant scores higher in 5 categories and MiMo-V2.5 in 4 categories; 4 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2.5 leads 35.4 to 26.1.
- The biggest single-benchmark swing is SciCode: 48.6% for GPT-5.5 Instant and 43.1% for MiMo-V2.5.
- MiMo-V2.5 has downloadable open weights; the other is API-only.

## Snapshot

| | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 42.5 | 43.0 |
| Rank | 99 | 89 |
| Context | — | 1.05M |
| Input $/M | — | $0.14 |
| Output $/M | — | $0.28 |
| Weights | Proprietary | Open |

## Coding

- GPT-5.5 Instant: 43.7 (#73)
- MiMo-V2.5: 43.6 (#75)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| SciCode | 48.6% | 43.1% |
| LMArena Coding | 1433 | 1469 |
| LMArena WebDev | — | 1438 |
| ALE-Bench | — | 513.95 |

## Reasoning

- GPT-5.5 Instant: 24.2 (#149)
- MiMo-V2.5: 27.8 (#98)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| CritPt | 0% | 3.7% |
| LMArena Hard Prompts | 1426 | 1450 |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.48 | — |

## Math

- GPT-5.5 Instant: 26.1 (#241)
- MiMo-V2.5: 35.4 (#145)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Math | 1420 | 1436 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| ProofBench | — | 16% |

## Knowledge

- GPT-5.5 Instant: 48.9 (#68)
- MiMo-V2.5: 40.2 (#109)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1409 | 1459 |
| GPQA Diamond | 82.5% | — |

## Multimodal

- GPT-5.5 Instant: 39.3 (#48)
- MiMo-V2.5: 39.0 (#53)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | 1250 | 1245 |
| LMArena Document | 1403 | — |

## Multilingual

- GPT-5.5 Instant: 53.0 (#76)
- MiMo-V2.5: 52.0 (#96)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1417 | 1404 |
| LMArena Chinese | 1457 | 1467 |
| LMArena French | 1428 | 1447 |
| LMArena German | 1410 | 1421 |
| LMArena Japanese | 1408 | 1304 |
| LMArena Korean | 1393 | 1363 |
| LMArena Russian | 1430 | 1395 |
| LMArena Spanish | 1430 | 1412 |

## Instruction Following

- GPT-5.5 Instant: 74.4 (#94)
- MiMo-V2.5: 75.7 (#55)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1407 | 1433 |

## Long Context

- GPT-5.5 Instant: 43.4 (#92)
- MiMo-V2.5: 44.1 (#69)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1422 | 1444 |

## Writing & Preference

- GPT-5.5 Instant: 62.0 (#81)
- MiMo-V2.5: 61.8 (#82)

| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1419 | 1427 |
| LMArena Creative Writing | 1420 | 1392 |
| LMArena Multi-Turn | 1434 | 1445 |

## FAQ

### Is GPT-5.5 Instant better than MiMo-V2.5?

GPT-5.5 Instant and MiMo-V2.5 score almost the same on the Noometry Index (42.5 vs 43.0), so choose on price, context window or the category you care about most.

### Is GPT-5.5 Instant or MiMo-V2.5 better for coding?

They score almost the same on coding (43.7 vs 43.6); test both on your own repository before choosing.

### How many benchmarks do GPT-5.5 Instant and MiMo-V2.5 share?

20 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and MiMo-V2.5 has 23.