Model comparison
Claude Sonnet 5.5 vs MiMo-V2.5
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 43.4 on the Noometry Index. MiMo-V2.5 costs 23× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Last verified . 18 shared benchmarks.
Summary
- They share 18 benchmarks with published results for both. Claude Sonnet 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 Sonnet 5.5 leads 87.9 to 36.8.
- The biggest single-benchmark swing is ProofBench: 100% for Claude Sonnet 5.5 and 16% for MiMo-V2.5.
- MiMo-V2.5 is cheaper at $0.14 / $0.28 per million input/output tokens, against $2 / $10 for Claude Sonnet 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.
Side by side
| Claude Sonnet 5.5 | MiMo-V2.5 | |
|---|---|---|
| Provider | Anthropic | Xiaomi |
| Noometry Index | 61.9 | 43.4 |
| Released | 2026-09-28 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | 1M | 1.05M |
| Max output | 128K | 131K |
| Input $ / M tokens | $2 | $0.14 |
| Output $ / M tokens | $10 | $0.28 |
| Results tracked | 32 | 23 |
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Category by category
Coding Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 67.3 (#6), MiMo-V2.5: 43.9 (#81)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena WebDev | 1774 | 1438 |
| SciCode | 61% | 43.1% |
| LMArena Coding | 1513 | 1469 |
| ALE-Bench | 1,819 | 513.95 |
| FrontierCode | 52.1% | — |
| CursorBench | 55.5% | — |
| FrontierSWE | 61.9% | — |
Agentic & Tool Use Not comparable
Claude Sonnet 5.5: 45.0 (#16), MiMo-V2.5: —
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| APEX-Agents | 75.5% | — |
Reasoning Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 54.0 (#28), MiMo-V2.5: 28.6 (#101)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| CritPt | 31.4% | 3.7% |
| LMArena Hard Prompts | 1495 | 1450 |
| NYT Connections (extended) | 80.5% | — |
| Mystery Game Puzzles | 65% | — |
| Epoch Capabilities Index | 165.03 | — |
Math Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 87.9 (#6), MiMo-V2.5: 36.8 (#163)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| ProofBench | 100% | 16% |
| LMArena Math | 1510 | 1436 |
| FrontierMath (Tiers 1-3) | 88.8% | — |
| FrontierMath Tier 4 | 80.5% | — |
| OTIS Mock AIME 2024-2025 | 100% | — |
| FrontierMath Erdős | 2.9% | — |
Knowledge Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#12), MiMo-V2.5: 40.8 (#115)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1540 | 1460 |
| GPQA Diamond | 95.6% | — |
| SimpleQA Verified | 46.5% | — |
Multimodal Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 51.5 (#6), MiMo-V2.5: 39.8 (#54)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | 1289 | 1247 |
| Furniture Assembly | 75% | — |
Multilingual Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 55.3 (#30), MiMo-V2.5: 51.9 (#99)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1452 | 1404 |
| LMArena Chinese | 1522 | 1468 |
| LMArena Russian | 1451 | 1395 |
| LMArena French | — | 1447 |
| LMArena German | — | 1421 |
| LMArena Japanese | — | 1306 |
| LMArena Korean | — | 1363 |
| LMArena Spanish | — | 1416 |
Instruction Following Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 78.3 (#11), MiMo-V2.5: 75.5 (#60)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1495 | 1434 |
Long Context Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 45.9 (#28), MiMo-V2.5: 44.2 (#73)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1498 | 1445 |
Writing & Preference Claude Sonnet 5.5 leads
Claude Sonnet 5.5: 66.0 (#40), MiMo-V2.5: 61.6 (#86)
| Benchmark | Claude Sonnet 5.5 | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1471 | 1428 |
| LMArena Creative Writing | 1465 | 1393 |
| LMArena Multi-Turn | 1474 | 1445 |
Frequently asked questions
Is Claude Sonnet 5.5 better than MiMo-V2.5?
Claude Sonnet 5.5 is the stronger model overall, scoring 61.9 to 43.4 on the Noometry Index. MiMo-V2.5 costs 23× less per token, which makes it the better buy when Claude Sonnet 5.5's lead doesn't matter for your workload.
Which is cheaper, Claude Sonnet 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 Sonnet 5.5 lists at $2 and $10.
Is Claude Sonnet 5.5 or MiMo-V2.5 better for coding?
Claude Sonnet 5.5 scores higher on coding benchmarks: 67.3 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 Sonnet 5.5 and MiMo-V2.5 share?
18 benchmarks have published results for both models. Claude Sonnet 5.5 has 32 scored results on Noometry and MiMo-V2.5 has 23.