# Claude Opus 5.5 vs MiMo-V2.5

> Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.4 on the Noometry Index. MiMo-V2.5 costs 46× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

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

## Summary

- They share 20 benchmarks with published results for both. Claude Opus 5.5 scores higher in 9 categories and MiMo-V2.5 in 0 categories; 9 gaps are clear of the uncertainty.
- The widest gap is in math, where Claude Opus 5.5 leads 91.8 to 36.8.
- The biggest single-benchmark swing is ProofBench: 100% for Claude Opus 5.5 and 16% for MiMo-V2.5.
- MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $4 / $20 for Claude Opus 5.5.
- MiMo-V2.5 accepts more context: 1.05M tokens versus 1M.
- MiMo-V2.5 has downloadable open weights; the other is API-only.

## Snapshot

| | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| Provider | Anthropic | Xiaomi |
| Noometry Index | 68.6 | 43.4 |
| Rank | 3 | 93 |
| Context | 1M | 1.05M |
| Input $/M | $4 | $0.14 |
| Output $/M | $20 | $0.28 |
| Weights | Proprietary | Open |

## Coding

- Claude Opus 5.5: 71.9 (#3)
- MiMo-V2.5: 43.9 (#81)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena WebDev | 1813 | 1438 |
| SciCode | 66.9% | 43.1% |
| LMArena Coding | 1547 | 1469 |
| ALE-Bench | 2,147 | 513.95 |
| FrontierCode | 54.6% | — |
| CursorBench | 57.8% | — |
| FrontierSWE | 62.3% | — |
| MirrorCode | 77.4% | — |

## Agentic & Tool Use

- Claude Opus 5.5: 45.3 (#15)
- MiMo-V2.5: —

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| APEX-Agents | 73.5% | — |
| GDP.pdf | 30.6% | — |
| Vending-Bench 2 | 9,235 | — |

## Reasoning

- Claude Opus 5.5: 80.2 (#3)
- MiMo-V2.5: 28.6 (#101)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| CritPt | 31.7% | 3.7% |
| LMArena Hard Prompts | 1535 | 1450 |
| ARC-AGI-2 | 93.3% | — |
| NYT Connections (extended) | 88.5% | — |
| ARC-AGI-1 | 98.5% | — |
| EBR-Bench | 71.4% | — |
| Mystery Game Puzzles | 71% | — |
| DTBench | 98.9% | — |
| LMCA | 68.2% | — |
| Epoch Capabilities Index | 167.33 | — |

## Math

- Claude Opus 5.5: 91.8 (#3)
- MiMo-V2.5: 36.8 (#163)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| ProofBench | 100% | 16% |
| LMArena Math | 1506 | 1436 |
| FrontierMath (Tiers 1-3) | 91.2% | — |
| FrontierMath Tier 4 | 95% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath Erdős | 2.9% | — |

## Knowledge

- Claude Opus 5.5: 66.4 (#10)
- MiMo-V2.5: 40.8 (#115)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1547 | 1460 |
| GPQA Diamond | 90.6% | — |
| SimpleQA Verified | 72.2% | — |

## Multimodal

- Claude Opus 5.5: 57.8 (#1)
- MiMo-V2.5: 39.8 (#54)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | 1321 | 1247 |
| Blueprint-Bench 2 | 51.2% | — |
| Furniture Assembly | 83.3% | — |

## Multilingual

- Claude Opus 5.5: 59.1 (#2)
- MiMo-V2.5: 51.9 (#99)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1507 | 1404 |
| LMArena Chinese | 1588 | 1468 |
| LMArena French | 1514 | 1447 |
| LMArena Russian | 1520 | 1395 |
| LMArena Spanish | 1507 | 1416 |
| LMArena German | — | 1421 |
| LMArena Japanese | — | 1306 |
| LMArena Korean | — | 1363 |

## Instruction Following

- Claude Opus 5.5: 80.0 (#3)
- MiMo-V2.5: 75.5 (#60)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1537 | 1434 |

## Long Context

- Claude Opus 5.5: 47.1 (#19)
- MiMo-V2.5: 44.2 (#73)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1532 | 1445 |

## Writing & Preference

- Claude Opus 5.5: 78.2 (#3)
- MiMo-V2.5: 61.6 (#86)

| Benchmark | Claude Opus 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1515 | 1428 |
| LMArena Creative Writing | 1533 | 1393 |
| LMArena Multi-Turn | 1499 | 1445 |
| EQ-Bench Creative Writing | 2050 | — |

## FAQ

### Is Claude Opus 5.5 better than MiMo-V2.5?

Claude Opus 5.5 is the stronger model overall, scoring 68.6 to 43.4 on the Noometry Index. MiMo-V2.5 costs 46× less per token, which makes it the better buy when Claude Opus 5.5's lead doesn't matter for your workload.

### Which is cheaper, Claude Opus 5.5 or MiMo-V2.5?

MiMo-V2.5 is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; Claude Opus 5.5 lists at $4 and $20.

### Is Claude Opus 5.5 or MiMo-V2.5 better for coding?

Claude Opus 5.5 scores higher on coding benchmarks: 71.9 versus 43.9 in the Noometry coding category.

### Which has the bigger context window?

MiMo-V2.5 does, with 1.05M tokens against 1M.

### How many benchmarks do Claude Opus 5.5 and MiMo-V2.5 share?

20 benchmarks have published results for both models. Claude Opus 5.5 has 44 scored results on Noometry and MiMo-V2.5 has 23.