Model comparison
GPT-5.5 Instant vs MiMo-V2.5-Pro
MiMo-V2.5-Pro is the stronger model overall, scoring 44.8 to 42.5 on the Noometry Index.
Last verified . 19 shared benchmarks.
Summary
- They share 19 benchmarks with published results for both. GPT-5.5 Instant scores higher in 1 category and MiMo-V2.5-Pro in 7 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2.5-Pro leads 38.6 to 26.1.
- MiMo-V2.5-Pro has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | MiMo-V2.5-Pro | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 42.5 | 44.8 |
| Released | 2026-05-05 | 2026-04-22 |
| Weights | Proprietary | Open |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.43 |
| Output $ / M tokens | — | $0.87 |
| Results tracked | 27 | 27 |
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Category by category
Coding MiMo-V2.5-Pro leads
GPT-5.5 Instant: 43.7 (#73), MiMo-V2.5-Pro: 47.0 (#58)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| SciCode | 48.6% | 50.2% |
| LMArena Coding | 1433 | 1502 |
| LMArena WebDev | — | 1477 |
| ALE-Bench | — | 899.8 |
Reasoning MiMo-V2.5-Pro leads
GPT-5.5 Instant: 24.2 (#149), MiMo-V2.5-Pro: 25.9 (#124)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| CritPt | 0% | 4% |
| LMArena Hard Prompts | 1426 | 1487 |
| NYT Connections (extended) | — | 34.4% |
| Chess Puzzles | 12% | — |
| DTBench | — | 84.5% |
| LMCA | — | 29.5% |
| Epoch Capabilities Index | 142.48 | — |
Math MiMo-V2.5-Pro leads
GPT-5.5 Instant: 26.1 (#241), MiMo-V2.5-Pro: 38.6 (#84)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Math | 1420 | 1480 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| ProofBench | — | 22% |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#68), MiMo-V2.5-Pro: 41.5 (#100)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Expert | 1409 | 1501 |
| GPQA Diamond | 82.5% | — |
Multimodal Not comparable
GPT-5.5 Instant: 39.3 (#48), MiMo-V2.5-Pro: —
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Vision | 1250 | — |
| LMArena Document | 1403 | — |
Multilingual MiMo-V2.5-Pro leads
GPT-5.5 Instant: 53.0 (#76), MiMo-V2.5-Pro: 55.3 (#33)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Non-English | 1417 | 1449 |
| LMArena Chinese | 1457 | 1507 |
| LMArena French | 1428 | 1489 |
| LMArena German | 1410 | 1455 |
| LMArena Japanese | 1408 | 1418 |
| LMArena Korean | 1393 | 1436 |
| LMArena Russian | 1430 | 1450 |
| LMArena Spanish | 1430 | 1470 |
Instruction Following MiMo-V2.5-Pro leads
GPT-5.5 Instant: 74.4 (#94), MiMo-V2.5-Pro: 77.6 (#21)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Instruction Following | 1407 | 1477 |
Long Context MiMo-V2.5-Pro leads
GPT-5.5 Instant: 43.4 (#92), MiMo-V2.5-Pro: 45.4 (#38)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Longer Query | 1422 | 1482 |
Writing & Preference MiMo-V2.5-Pro leads
GPT-5.5 Instant: 62.0 (#81), MiMo-V2.5-Pro: 65.5 (#47)
| Benchmark | GPT-5.5 Instant | MiMo-V2.5-Pro |
|---|---|---|
| LMArena Text | 1419 | 1465 |
| LMArena Creative Writing | 1420 | 1440 |
| LMArena Multi-Turn | 1434 | 1477 |
| EQ-Bench Creative Writing | — | 1493 |
| EQ-Bench 4 | — | 1208 |
Frequently asked questions
Is GPT-5.5 Instant better than MiMo-V2.5-Pro?
MiMo-V2.5-Pro is the stronger model overall, scoring 44.8 to 42.5 on the Noometry Index.
Is GPT-5.5 Instant or MiMo-V2.5-Pro better for coding?
MiMo-V2.5-Pro scores higher on coding benchmarks: 47.0 versus 43.7 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and MiMo-V2.5-Pro share?
19 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and MiMo-V2.5-Pro has 27.