Model comparison
GPT-5.5 Instant vs MiMo-V2.5
GPT-5.5 Instant and MiMo-V2.5 score almost the same on the Noometry Index (42.7 vs 43.4), so choose on price, context window or the category you care about most.
Last verified . 20 shared benchmarks.
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 36.8 to 26.5.
- 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.
Side by side
| GPT-5.5 Instant | MiMo-V2.5 | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 42.7 | 43.4 |
| Released | 2026-05-05 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.14 |
| Output $ / M tokens | — | $0.28 |
| Results tracked | 27 | 23 |
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Category by category
Coding Too close to call
GPT-5.5 Instant: 44.3 (#74), MiMo-V2.5: 43.9 (#81)
| 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 MiMo-V2.5 leads
GPT-5.5 Instant: 24.9 (#155), MiMo-V2.5: 28.6 (#101)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| CritPt | 0% | 3.7% |
| LMArena Hard Prompts | 1426 | 1450 |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math MiMo-V2.5 leads
GPT-5.5 Instant: 26.5 (#259), MiMo-V2.5: 36.8 (#163)
| 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 leads
GPT-5.5 Instant: 48.9 (#74), MiMo-V2.5: 40.8 (#115)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Expert | 1409 | 1460 |
| GPQA Diamond | 82.5% | — |
Multimodal Too close to call
GPT-5.5 Instant: 40.0 (#52), MiMo-V2.5: 39.8 (#54)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Vision | 1250 | 1247 |
| LMArena Document | 1403 | — |
Multilingual Too close to call
GPT-5.5 Instant: 52.8 (#80), MiMo-V2.5: 51.9 (#99)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Non-English | 1417 | 1404 |
| LMArena Chinese | 1456 | 1468 |
| LMArena French | 1428 | 1447 |
| LMArena German | 1411 | 1421 |
| LMArena Japanese | 1408 | 1306 |
| LMArena Korean | 1392 | 1363 |
| LMArena Russian | 1431 | 1395 |
| LMArena Spanish | 1429 | 1416 |
Instruction Following MiMo-V2.5 leads
GPT-5.5 Instant: 74.2 (#100), MiMo-V2.5: 75.5 (#60)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Instruction Following | 1406 | 1434 |
Long Context Too close to call
GPT-5.5 Instant: 43.4 (#96), MiMo-V2.5: 44.2 (#73)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Longer Query | 1422 | 1445 |
Writing & Preference Too close to call
GPT-5.5 Instant: 61.8 (#85), MiMo-V2.5: 61.6 (#86)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5 |
|---|---|---|
| LMArena Text | 1419 | 1428 |
| LMArena Creative Writing | 1419 | 1393 |
| LMArena Multi-Turn | 1433 | 1445 |
Frequently asked questions
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 (42.7 vs 43.4), 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 (44.3 vs 43.9); 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.