Model comparison
MiMo-V2.6-Flash vs o3
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 47.5 on the Noometry Index.
Last verified . 16 shared benchmarks.
Summary
- They share 16 benchmarks with published results for both. MiMo-V2.6-Flash scores higher in 5 categories and o3 in 4 categories; 7 gaps are clear of the uncertainty.
- The widest gap is in knowledge, where o3 leads 54.6 to 42.2.
- The biggest single-benchmark swing is CritPt: 12% for MiMo-V2.6-Flash and 1.4% for o3.
- MiMo-V2.6-Flash is cheaper at $0.14 / $0.28 per million input/output tokens, against $2 / $8 for o3.
- MiMo-V2.6-Flash accepts more context: 1.05M tokens versus 200K.
- MiMo-V2.6-Flash has downloadable open weights; the other is API-only.
Side by side
| MiMo-V2.6-Flash | o3 | |
|---|---|---|
| Provider | Xiaomi | OpenAI |
| Noometry Index | 48.5 | 47.5 |
| Released | 2026-09-21 | 2025-04-16 |
| Weights | Open | Proprietary |
| Context window | 1.05M | 200K |
| Max output | 131K | 100K |
| Input $ / M tokens | $0.14 | $2 |
| Output $ / M tokens | $0.28 | $8 |
| Results tracked | 19 | 63 |
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Category by category
Coding MiMo-V2.6-Flash leads
MiMo-V2.6-Flash: 53.4 (#30), o3: 46.8 (#64)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Coding | 1504 | 1408 |
| SWE-bench Verified | — | 62.3% |
| SWE-bench Verified (bash only) | — | 58.4% |
| Aider Polyglot | — | 81.3% |
| LMArena WebDev | 1637 | — |
| SciCode | 51.3% | — |
| GSO | — | 8.8% |
| WeirdML | — | 52.4% |
| CadEval | — | 74% |
| ALE-Bench | — | 933.55 |
Agentic & Tool Use Not comparable
MiMo-V2.6-Flash: —, o3: 34.5 (#44)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| Berkeley Function Calling Leaderboard | — | 63% |
| GDPval | — | 30.8% |
| DeepResearch Bench | — | 45.2% |
| OSWorld | — | 23% |
| LMArena Search | — | 1144 |
| METR Time Horizons | — | 65.4% |
Reasoning MiMo-V2.6-Flash leads
MiMo-V2.6-Flash: 36.5 (#66), o3: 32.0 (#78)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| CritPt | 12% | 1.4% |
| LMArena Hard Prompts | 1482 | 1402 |
| ARC-AGI-2 | — | 6.5% |
| SimpleBench | — | 53.1% |
| Kagi LLM Benchmark | — | 67.6% |
| ARC-AGI-1 | — | 60.8% |
| Chess Puzzles | — | 38% |
| EnigmaEval | — | 13.1% |
| Mystery Game Puzzles | — | 29% |
| DTBench | — | 84.8% |
| LMCA | — | 39.7% |
| Epoch Capabilities Index | — | 146.86 |
| ForecastBench | — | 62.5 |
Math MiMo-V2.6-Flash leads
MiMo-V2.6-Flash: 51.9 (#52), o3: 50.2 (#58)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Math | 1468 | 1426 |
| FrontierMath (Tiers 1-3) | — | 33.3% |
| OTIS Mock AIME 2024-2025 | — | 84.4% |
| ProofBench | 63% | — |
| Omni-MATH | — | 71.4% |
| MATH Level 5 | — | 97.8% |
| FrontierMath (Feb 2025 set) | — | 18.7% |
| FrontierMath Tier 4 (v1) | — | 2.1% |
Knowledge o3 leads
MiMo-V2.6-Flash: 42.2 (#99), o3: 54.6 (#52)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Expert | 1501 | 1402 |
| GPQA Diamond | — | 81.8% |
| Humanity's Last Exam | — | 20.3% |
| SimpleQA Verified | — | 49.4% |
| MMLU-Pro | — | 85.9% |
| Confabulations | — | 14.4% |
| GPQA (HELM) | — | 75.3% |
Multimodal Too close to call
MiMo-V2.6-Flash: 40.5 (#47), o3: 41.4 (#36)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Vision | 1259 | 1214 |
| GeoBench | — | 74% |
| VPCT | — | 52% |
Multilingual MiMo-V2.6-Flash leads
MiMo-V2.6-Flash: 54.0 (#51), o3: 51.7 (#105)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Non-English | 1434 | 1401 |
| LMArena Chinese | 1511 | 1437 |
| LMArena French | 1475 | 1430 |
| LMArena Russian | 1409 | 1406 |
| LMArena Spanish | 1456 | 1395 |
| LMArena German | — | 1420 |
| LMArena Japanese | — | 1403 |
| LMArena Korean | — | 1370 |
Instruction Following MiMo-V2.6-Flash leads
MiMo-V2.6-Flash: 76.8 (#35), o3: 72.8 (#127)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Instruction Following | 1463 | 1368 |
| IFEval | — | 86.9% |
Long Context o3 leads
MiMo-V2.6-Flash: 44.8 (#57), o3: 53.3 (#6)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Longer Query | 1463 | 1372 |
| Fiction.LiveBench | — | 88.9% |
| CL-bench | — | 17.8% |
Writing & Preference Too close to call
MiMo-V2.6-Flash: 63.1 (#67), o3: 63.5 (#64)
| Benchmark | MiMo-V2.6-Flash | o3 |
|---|---|---|
| LMArena Text | 1455 | 1410 |
| LMArena Creative Writing | 1400 | 1359 |
| LMArena Multi-Turn | 1451 | 1405 |
| Short-Story Creative Writing | — | 83.9% |
| EQ-Bench Creative Writing | — | 1676 |
| WildBench | — | 86.1% |
Frequently asked questions
Is MiMo-V2.6-Flash better than o3?
MiMo-V2.6-Flash is the stronger model overall, scoring 48.5 to 47.5 on the Noometry Index.
Which is cheaper, MiMo-V2.6-Flash or o3?
MiMo-V2.6-Flash is cheaper. It lists at $0.14 per million input tokens and $0.28 per million output tokens; o3 lists at $2 and $8.
Is MiMo-V2.6-Flash or o3 better for coding?
MiMo-V2.6-Flash scores higher on coding benchmarks: 53.4 versus 46.8 in the Noometry coding category.
Which has the bigger context window?
MiMo-V2.6-Flash does, with 1.05M tokens against 200K.
How many benchmarks do MiMo-V2.6-Flash and o3 share?
16 benchmarks have published results for both models. MiMo-V2.6-Flash has 19 scored results on Noometry and o3 has 63.