Model comparison
GPT-5.5 Instant vs MiMo-V2.6-Flash
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 42.7 on the Noometry Index.
Last verified . 17 shared benchmarks.
Summary
- They share 17 benchmarks with published results for both. GPT-5.5 Instant scores higher in 1 category and MiMo-V2.6-Flash in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where MiMo-V2.6-Flash leads 51.9 to 26.5.
- The biggest single-benchmark swing is CritPt: 0% for GPT-5.5 Instant and 12% for MiMo-V2.6-Flash.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.
Side by side
| GPT-5.5 Instant | MiMo-V2.6-Flash | |
|---|---|---|
| Provider | OpenAI | Xiaomi |
| Noometry Index | 42.7 | 48.5 |
| Released | 2026-05-05 | 2026-09-21 |
| Weights | Proprietary | Open |
| Context window | — | 1.05M |
| Max output | — | 131K |
| Input $ / M tokens | — | $0.14 |
| Output $ / M tokens | — | $0.28 |
| Results tracked | 27 | 19 |
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Category by category
Coding MiMo-V2.6-Flash leads
GPT-5.5 Instant: 44.3 (#74), MiMo-V2.6-Flash: 53.4 (#30)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| SciCode | 48.6% | 51.3% |
| LMArena Coding | 1433 | 1504 |
| LMArena WebDev | — | 1637 |
Reasoning MiMo-V2.6-Flash leads
GPT-5.5 Instant: 24.9 (#155), MiMo-V2.6-Flash: 36.5 (#66)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| CritPt | 0% | 12% |
| LMArena Hard Prompts | 1426 | 1482 |
| Chess Puzzles | 12% | — |
| Epoch Capabilities Index | 142.52 | — |
Math MiMo-V2.6-Flash leads
GPT-5.5 Instant: 26.5 (#259), MiMo-V2.6-Flash: 51.9 (#52)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Math | 1420 | 1468 |
| FrontierMath (Tiers 1-3) | 26.3% | — |
| FrontierMath Tier 4 | 2.4% | — |
| OTIS Mock AIME 2024-2025 | 68.1% | — |
| ProofBench | — | 63% |
Knowledge GPT-5.5 Instant leads
GPT-5.5 Instant: 48.9 (#74), MiMo-V2.6-Flash: 42.2 (#99)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Expert | 1409 | 1501 |
| GPQA Diamond | 82.5% | — |
Multimodal Too close to call
GPT-5.5 Instant: 40.0 (#52), MiMo-V2.6-Flash: 40.5 (#47)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Vision | 1250 | 1259 |
| LMArena Document | 1403 | — |
Multilingual MiMo-V2.6-Flash leads
GPT-5.5 Instant: 52.8 (#80), MiMo-V2.6-Flash: 54.0 (#51)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Non-English | 1417 | 1434 |
| LMArena Chinese | 1456 | 1511 |
| LMArena French | 1428 | 1475 |
| LMArena Russian | 1431 | 1409 |
| LMArena Spanish | 1429 | 1456 |
| LMArena German | 1411 | — |
| LMArena Japanese | 1408 | — |
| LMArena Korean | 1392 | — |
Instruction Following MiMo-V2.6-Flash leads
GPT-5.5 Instant: 74.2 (#100), MiMo-V2.6-Flash: 76.8 (#35)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Instruction Following | 1406 | 1463 |
Long Context MiMo-V2.6-Flash leads
GPT-5.5 Instant: 43.4 (#96), MiMo-V2.6-Flash: 44.8 (#57)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Longer Query | 1422 | 1463 |
Writing & Preference MiMo-V2.6-Flash leads
GPT-5.5 Instant: 61.8 (#85), MiMo-V2.6-Flash: 63.1 (#67)
| Benchmark | GPT-5.5 Instant | MiMo-V2.6-Flash |
|---|---|---|
| LMArena Text | 1419 | 1455 |
| LMArena Creative Writing | 1419 | 1400 |
| LMArena Multi-Turn | 1433 | 1451 |
Frequently asked questions
Is GPT-5.5 Instant better than MiMo-V2.6-Flash?
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 42.7 on the Noometry Index.
Is GPT-5.5 Instant or MiMo-V2.6-Flash better for coding?
MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 44.3 in the Noometry coding category.
How many benchmarks do GPT-5.5 Instant and MiMo-V2.6-Flash share?
17 benchmarks have published results for both models. GPT-5.5 Instant has 27 scored results on Noometry and MiMo-V2.6-Flash has 19.