o3 Mini vs MiMo-V2.5
Updated October 21, 2026. 42 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
Decision reading
Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 34.0 for MiMo-V2.5.
Pick MiMo-V2.5 when output tokens cost 18.5x less, or when the context window is larger, 1.05M against 200K tokens.
- Shared results
- 42
- o3 Mini only
- 28
- MiMo-V2.5 only
- 38
- Like-for-like categories
- 7 of 9
Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.
Which one for your work
Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.
Coding
Vibe Coding Index, four public coding benchmarks
o3 Mini
o3 Mini scores 52.1 against 34.0.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
MiMo-V2.5
MiMo-V2.5 leads, 21.8 against 12.5.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only MiMo-V2.5 has a AA Agentic Index result, 15.8.
Directional only
Reasoning
GPQA Diamond
MiMo-V2.5
MiMo-V2.5 leads, 81.6% against 75.5%.
Same board, both measured
Math
AIME
No call
Only o3 Mini has a AIME result, 86.5%.
Directional only
Knowledge
MMLU Pro
MiMo-V2.5
MiMo-V2.5 leads, 82.9% against 78.7%.
Same board, both measured
Web design
Design Arena: websites
No call
Only MiMo-V2.5 has a Design Arena: websites result, 1266.
Directional only
Long documents
Listed context window
MiMo-V2.5
MiMo-V2.5 takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
MiMo-V2.5
o3 Mini $0.0033, MiMo-V2.5 $0.0002 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only MiMo-V2.5 has the number, $0.01.
Directional only
At a glance
- Coding index
- o3 Mini 52.1 from 2 benchmarks, MiMo-V2.5 34.0 from 1 benchmark.
- Widest category
- Agentic work, 59.4 points apart on average over 1 shared benchmark.
- Widest single gap
- τ²-Bench Telecom: o3 Mini 31.3% against MiMo-V2.5 90.6%, 59.4 points apart on a 0 to 100 scale.
- Output price
- o3 Mini $4.40 against MiMo-V2.5 $0.238 per million output tokens, 18.5x apart.
- Context window
- o3 Mini takes 200K tokens, MiMo-V2.5 1.05M.
Benchmark by benchmark
First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.
| Category | o3 Mini | Bars | MiMo-V2.5 | Ties |
|---|---|---|---|---|
| Coding | 0 | 5 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 1 | ||
| Reasoning | 0 | 6 | ||
| Math | 0 | 2 | ||
| Knowledge | 0 | 8 | ||
| General | 0 | 18 | 1 tie | |
| All shared boards | 0 | 41 | 1 tie |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index05
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| Aider polyglot | 60.4% | Not measured | Only o3 Mini measured |
| SWE-bench Verified | 42.4% | Not measured | Only o3 Mini measured |
| SWE-bench Lite | 32.3% | Not measured | Only o3 Mini measured |
| LMArena WebDev | Not measured | 1438 | Only MiMo-V2.5 measured |
| AA Coding Index | Not measured | 56.8 | Only MiMo-V2.5 measured |
| LiveCodeBench (Vals AI) | 71.5% | 81.5% | MiMo-V2.5 |
| SWE-bench Verified (Vals AI) | Not measured | 71.0% | Only MiMo-V2.5 measured |
| Vibe Code Bench (Vals AI) | Not measured | 42.2% | Only MiMo-V2.5 measured |
| Code migration (Vals AI) | Not measured | 14.2% | Only MiMo-V2.5 measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 60.7% | Only MiMo-V2.5 measured |
| LiveCodeBench (Artificial Analysis run) | 73.4% | Not measured | Only o3 Mini measured |
| SciCode | 42.8% | 43.9% | MiMo-V2.5 |
| Terminal-Bench Hard (Artificial Analysis run) | 6.8% | 41.7% | MiMo-V2.5 |
| GSO-Bench | 1.3% | Not measured | Only o3 Mini measured |
| WeirdML | 43.7% | Not measured | Only o3 Mini measured |
| Cybench | 22.5% | Not measured | Only o3 Mini measured |
| ALE-Bench | Not measured | 514.0 | Only MiMo-V2.5 measured |
| LMArena Text: coding | 1378 | 1469 | MiMo-V2.5 |
| LMArena Text: software and IT | 1364 | 1463 | MiMo-V2.5 |
| LMArena WebDev: React | Not measured | 1425 | Only MiMo-V2.5 measured |
| LMArena WebDev: HTML | Not measured | 1429 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 17 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| AA Intelligence Index | 12.5 | 21.8 | MiMo-V2.5 |
| Epoch Capabilities Index | 140.2 | Not measured | Only o3 Mini measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 15.8 | Only MiMo-V2.5 measured |
| Finance Agent (Vals AI) | Not measured | 36.7% | Only MiMo-V2.5 measured |
| Tax Agent Bench (Vals AI) | Not measured | 7.8% | Only MiMo-V2.5 measured |
| Legal Research Bench (Vals AI) | Not measured | 9.1% | Only MiMo-V2.5 measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 55.1% | Only MiMo-V2.5 measured |
| τ²-Bench Telecom | 31.3% | 90.6% | MiMo-V2.5 |
| Neither model has a result on the other 33 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| GPQA Diamond | 75.5% | 81.6% | MiMo-V2.5 |
| MMMU Pro (Vals AI) | Not measured | 80.0% | Only MiMo-V2.5 measured |
| GPQA Diamond (Artificial Analysis run) | 77.3% | 84.9% | MiMo-V2.5 |
| Humanity's Last Exam (Artificial Analysis run) | 12.0% | 27.2% | MiMo-V2.5 |
| GPQA Diamond (Epoch AI run) | 77.0% | Not measured | Only o3 Mini measured |
| ARC-AGI | 34.5% | Not measured | Only o3 Mini measured |
| ARC-AGI-2 | 3.0% | Not measured | Only o3 Mini measured |
| SimpleBench | 22.8% | Not measured | Only o3 Mini measured |
| Chess puzzles | 15.0% | Not measured | Only o3 Mini measured |
| Mystery game puzzles | 7.0% | Not measured | Only o3 Mini measured |
| LMArena Text: hard prompts | 1365 | 1450 | MiMo-V2.5 |
| LMArena Text: expert | 1364 | 1459 | MiMo-V2.5 |
| LMArena Text: hard prompts in English | 1375 | 1461 | MiMo-V2.5 |
| LMArena Vision: diagrams | Not measured | 1269 | Only MiMo-V2.5 measured |
| LMArena Vision: homework | Not measured | 1262 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| AIME | 86.5% | Not measured | Only o3 Mini measured |
| MATH 500 (Vals AI) | 91.8% | Not measured | Only o3 Mini measured |
| MGSM (Vals AI) | 91.3% | Not measured | Only o3 Mini measured |
| OTIS Mock AIME | 76.9% | Not measured | Only o3 Mini measured |
| FrontierMath, tiers 1 to 3 | 18.6% | Not measured | Only o3 Mini measured |
| FrontierMath, tier 4 | 0.0% | Not measured | Only o3 Mini measured |
| ProofBench | Not measured | 16.0% | Only MiMo-V2.5 measured |
| MATH level 5 | 96.5% | Not measured | Only o3 Mini measured |
| LMArena Text: math | 1396 | 1436 | MiMo-V2.5 |
| LMArena Text: mathematical work | 1399 | 1451 | MiMo-V2.5 |
| Neither model has a result on the other 3 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index08
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| MMLU Pro | 78.7% | 82.9% | MiMo-V2.5 |
| LegalBench (Vals AI) | 71.5% | 78.9% | MiMo-V2.5 |
| CorpFin (Vals AI) | 45.3% | 59.9% | MiMo-V2.5 |
| TaxEval (Vals AI) | 69.4% | 71.8% | MiMo-V2.5 |
| MortgageTax (Vals AI) | Not measured | 59.3% | Only MiMo-V2.5 measured |
| MedQA (Vals AI) | 94.8% | Not measured | Only o3 Mini measured |
| MedCode (Vals AI) | Not measured | 31.9% | Only MiMo-V2.5 measured |
| MMLU Pro (Artificial Analysis run) | 80.2% | Not measured | Only o3 Mini measured |
| SimpleQA Verified | 15.3% | Not measured | Only o3 Mini measured |
| LMArena Text: science | 1339 | 1440 | MiMo-V2.5 |
| LMArena Text: medicine and healthcare | 1330 | 1432 | MiMo-V2.5 |
| LMArena Text: legal and government | 1328 | 1425 | MiMo-V2.5 |
| LMArena Text: business and finance | 1313 | 1432 | MiMo-V2.5 |
| Neither model has a result on the other 4 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| Design Arena: websites | Not measured | 1266 | Only MiMo-V2.5 measured |
| Design Arena: UI components | Not measured | 1257 | Only MiMo-V2.5 measured |
| Design Arena: game dev | Not measured | 1249 | Only MiMo-V2.5 measured |
| Design Arena: data viz | Not measured | 1249 | Only MiMo-V2.5 measured |
| Design Arena: 3D | Not measured | 1216 | Only MiMo-V2.5 measured |
| Design Arena: all code categories | Not measured | 1260 | Only MiMo-V2.5 measured |
| Design Arena: SVG | Not measured | 1178 | Only MiMo-V2.5 measured |
| Design Arena: ASCII art | Not measured | 1141 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index018
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| SAGE (Vals AI) | Not measured | 43.3% | Only MiMo-V2.5 measured |
| MedScribe (Vals AI) | Not measured | 72.2% | Only MiMo-V2.5 measured |
| Vals Multimodal Index | Not measured | 52.8% | Only MiMo-V2.5 measured |
| IFBench | 67.1% | 67.1% | Tie |
| Long context reasoning (AA-LCR) | 43.0% | 73.0% | MiMo-V2.5 |
| DTBench | 68.8% | Not measured | Only o3 Mini measured |
| LMCA | 19.0% | Not measured | Only o3 Mini measured |
| Fiction.LiveBench | 50.0% | Not measured | Only o3 Mini measured |
| Creative writing (Lech Mazur) | 61.7% | Not measured | Only o3 Mini measured |
| LMArena Text | 1337 | 1428 | MiMo-V2.5 |
| LMArena Text: instruction following | 1337 | 1435 | MiMo-V2.5 |
| LMArena Text: creative writing | 1286 | 1393 | MiMo-V2.5 |
| LMArena Vision | Not measured | 1247 | Only MiMo-V2.5 measured |
| LMArena Text: English | 1351 | 1447 | MiMo-V2.5 |
| LMArena Text: non-English | 1319 | 1405 | MiMo-V2.5 |
| LMArena Text: Chinese | 1379 | 1469 | MiMo-V2.5 |
| LMArena Text: German | 1303 | 1421 | MiMo-V2.5 |
| LMArena Text: Japanese | 1286 | 1306 | MiMo-V2.5 |
| LMArena Text: Korean | 1313 | 1361 | MiMo-V2.5 |
| LMArena Text: French | 1334 | 1448 | MiMo-V2.5 |
| LMArena Text: Spanish | 1321 | 1414 | MiMo-V2.5 |
| LMArena Text: Russian | 1304 | 1396 | MiMo-V2.5 |
| LMArena Text: Polish | 1294 | 1413 | MiMo-V2.5 |
| LMArena Text: multi-turn | 1320 | 1445 | MiMo-V2.5 |
| LMArena Text: longer queries | 1343 | 1445 | MiMo-V2.5 |
| LMArena Text: writing and language | 1313 | 1409 | MiMo-V2.5 |
| LMArena Text: entertainment and media | 1283 | 1399 | MiMo-V2.5 |
| LMArena Vision: English | Not measured | 1259 | Only MiMo-V2.5 measured |
| LMArena Vision: Chinese | Not measured | 1326 | Only MiMo-V2.5 measured |
| LMArena Vision: reading text | Not measured | 1256 | Only MiMo-V2.5 measured |
| LMArena Vision: humor | Not measured | 1226 | Only MiMo-V2.5 measured |
| LMArena Vision: recognizing things | Not measured | 1189 | Only MiMo-V2.5 measured |
| LMArena Vision: creative writing | Not measured | 1230 | Only MiMo-V2.5 measured |
| Neither model has a result on the other 13 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 Mini | MiMo-V2.5 | Leader |
|---|---|---|---|
| Neither model has a result on 5 boards here | |||
What each workload costs
Three fixed token mixes at each model's listed price, so per-token rates become a bill.
Chat turn
1K input + 500 output tokens
MiMo-V2.5 costs less
Repository review
50K input + 3K output tokens
MiMo-V2.5 costs less
Agent loop
200K input + 10K output tokens
MiMo-V2.5 costs less
Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.
Specification differences
The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.
| Specification | OpenAI o3 Mini | Xiaomi MiMo-V2.5 |
|---|---|---|
| Maker | OpenAI | Xiaomi |
| Weights | No public weights listed | Open weights |
| Released | January 31, 2025 | April 22, 2026 |
| Context window | 200K | 1.05M |
| Input $/Mtok | $1.10 | $0.119 |
| Output $/Mtok | $4.40 | $0.238 |
| Coding index | 52.1 | 34.0 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | Not computable | $0.01 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is o3 Mini better than MiMo-V2.5 for coding?
Pick o3 Mini for coding: it scores 52.1 on the Vibe Coding Index against 34.0 for MiMo-V2.5. Pick MiMo-V2.5 when output tokens cost 18.5x less, or when the context window is larger, 1.05M against 200K tokens.
Which is cheaper, o3 Mini or MiMo-V2.5?
o3 Mini costs $1.10 per million input tokens and $4.40 per million output tokens; MiMo-V2.5 costs $0.119 and $0.238. Cost per solved task is known for MiMo-V2.5 only.
Which has the bigger context window, o3 Mini or MiMo-V2.5?
MiMo-V2.5, with 1.05M tokens against 200K.
How many benchmarks is the o3 Mini vs MiMo-V2.5 comparison based on?
42 benchmarks have a result for both models as of October 21, 2026. o3 Mini's coding index rests on 2 independent benchmarks and MiMo-V2.5's on 1. Where only one model has a result, the page says so instead of naming a winner.