o3 vs MiMo-V2.5-Pro
Updated October 21, 2026. 51 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 for coding: it scores 70.7 on the Vibe Coding Index against 40.0 for MiMo-V2.5-Pro.
Pick MiMo-V2.5-Pro when output tokens cost 13.1x less, or when a solved task costs $0.03 against $0.571.
- Shared results
- 51
- o3 only
- 46
- MiMo-V2.5-Pro only
- 19
- Like-for-like categories
- 8 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
o3 scores 70.7 against 40.0.
2 and 1 benchmarks behind the scores
Intelligence
AA Intelligence Index
MiMo-V2.5-Pro
MiMo-V2.5-Pro leads, 26.0 against 20.2.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only MiMo-V2.5-Pro has a AA Agentic Index result, 21.3.
Directional only
Reasoning
GPQA Diamond
o3
o3 leads, 84.1% against 82.6%.
Same board, both measured
Math
AIME
No call
Only o3 has a AIME result, 85.3%.
Directional only
Knowledge
MMLU Pro
o3
o3 leads, 85.6% against 84.6%.
Same board, both measured
Web design
Design Arena: websites
MiMo-V2.5-Pro
MiMo-V2.5-Pro leads, 1267 against 1036.
Same board, both measured
Long documents
Listed context window
MiMo-V2.5-Pro
MiMo-V2.5-Pro takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
MiMo-V2.5-Pro
o3 $0.0060, MiMo-V2.5-Pro $0.0006 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
MiMo-V2.5-Pro
o3 $0.571, MiMo-V2.5-Pro $0.03.
Published attempt cost and pass rate
At a glance
- Coding index
- o3 70.7 from 2 benchmarks, MiMo-V2.5-Pro 40.0 from 1 benchmark.
- Widest category
- Web design, 24.8 points apart on average over 5 shared benchmarks.
- Widest single gap
- Design Arena: all code categories: o3 1021 against MiMo-V2.5-Pro 1266, 30.6 points apart on a 0 to 100 scale.
- Output price
- o3 $8.00 against MiMo-V2.5-Pro $0.609 per million output tokens, 13.1x apart.
- Context window
- o3 takes 200K tokens, MiMo-V2.5-Pro 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 | Bars | MiMo-V2.5-Pro | Ties |
|---|---|---|---|---|
| Coding | 2 | 3 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 1 | ||
| Reasoning | 1 | 5 | ||
| Math | 0 | 2 | ||
| Knowledge | 4 | 5 | ||
| Web design | 0 | 5 | ||
| General | 2 | 20 | ||
| All shared boards | 9 | 42 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index23
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| Aider polyglot | 81.3% | Not measured | Only o3 measured |
| SWE-bench Verified | 58.4% | Not measured | Only o3 measured |
| SWE-bench Multimodal | 36.0% | Not measured | Only o3 measured |
| LMArena WebDev | Not measured | 1480 | Only MiMo-V2.5-Pro measured |
| AA Coding Index | Not measured | 60.2 | Only MiMo-V2.5-Pro measured |
| LiveCodeBench (Vals AI) | 83.9% | 81.3% | o3 |
| SWE-bench Verified (Vals AI) | Not measured | 74.0% | Only MiMo-V2.5-Pro measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 0.5% | Only MiMo-V2.5-Pro measured |
| Vibe Code Bench (Vals AI) | Not measured | 34.1% | Only MiMo-V2.5-Pro measured |
| Code migration (Vals AI) | Not measured | 21.6% | Only MiMo-V2.5-Pro measured |
| Terminal-Bench 2.1 (Vals AI) | Not measured | 57.3% | Only MiMo-V2.5-Pro measured |
| LiveCodeBench (Artificial Analysis run) | 80.8% | Not measured | Only o3 measured |
| SciCode | Not measured | 50.6% | Only MiMo-V2.5-Pro measured |
| Terminal-Bench Hard (Artificial Analysis run) | 37.1% | 43.2% | MiMo-V2.5-Pro |
| GSO-Bench | 8.8% | Not measured | Only o3 measured |
| WeirdML | 52.4% | Not measured | Only o3 measured |
| ALE-Bench | 933.5 | 899.8 | o3 |
| LMArena Text: coding | 1407 | 1501 | MiMo-V2.5-Pro |
| LMArena Text: software and IT | 1415 | 1495 | MiMo-V2.5-Pro |
| LMArena WebDev: React | Not measured | 1469 | Only MiMo-V2.5-Pro measured |
| LMArena WebDev: HTML | Not measured | 1473 | Only MiMo-V2.5-Pro 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 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| AA Intelligence Index | 20.2 | 26.0 | MiMo-V2.5-Pro |
| Epoch Capabilities Index | 146.7 | Not measured | Only o3 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| AA Agentic Index | Not measured | 21.3 | Only MiMo-V2.5-Pro measured |
| Finance Agent (Vals AI) | Not measured | 41.5% | Only MiMo-V2.5-Pro measured |
| Tax Agent Bench (Vals AI) | Not measured | 11.5% | Only MiMo-V2.5-Pro measured |
| Legal Research Bench (Vals AI) | Not measured | 15.9% | Only MiMo-V2.5-Pro measured |
| Excel Modeling Benchmark (Vals AI) | Not measured | 55.2% | Only MiMo-V2.5-Pro measured |
| τ²-Bench Telecom | 80.7% | 94.2% | MiMo-V2.5-Pro |
| METR time horizons | 65.4% | Not measured | Only o3 measured |
| GDPval | 30.8% | Not measured | Only o3 measured |
| DeepResearch Bench | 45.2% | Not measured | Only o3 measured |
| OSWorld | 23.0% | Not measured | Only o3 measured |
| Neither model has a result on the other 29 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| GPQA Diamond | 84.1% | 82.6% | o3 |
| MMMU Pro (Vals AI) | 80.4% | Not measured | Only o3 measured |
| GPQA Diamond (Artificial Analysis run) | 82.7% | 86.6% | MiMo-V2.5-Pro |
| Humanity's Last Exam (Artificial Analysis run) | 20.1% | 35.7% | MiMo-V2.5-Pro |
| GPQA Diamond (Epoch AI run) | 81.8% | Not measured | Only o3 measured |
| ARC-AGI | 60.8% | Not measured | Only o3 measured |
| ARC-AGI-2 | 6.5% | Not measured | Only o3 measured |
| SimpleBench | 53.1% | Not measured | Only o3 measured |
| Chess puzzles | 37.0% | Not measured | Only o3 measured |
| Mystery game puzzles | 29.0% | Not measured | Only o3 measured |
| VPCT | 52.0% | Not measured | Only o3 measured |
| LMArena Text: hard prompts | 1402 | 1486 | MiMo-V2.5-Pro |
| LMArena Text: expert | 1402 | 1501 | MiMo-V2.5-Pro |
| LMArena Text: hard prompts in English | 1411 | 1494 | MiMo-V2.5-Pro |
| LMArena Vision: diagrams | 1220 | Not measured | Only o3 measured |
| LMArena Vision: homework | 1234 | Not measured | Only o3 measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index02
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| AIME | 85.3% | Not measured | Only o3 measured |
| MATH 500 (Vals AI) | 94.6% | Not measured | Only o3 measured |
| MGSM (Vals AI) | 91.8% | Not measured | Only o3 measured |
| AA Math Index | 88.3 | Not measured | Only o3 measured |
| AIME 2025 (Artificial Analysis run) | 88.3% | Not measured | Only o3 measured |
| OTIS Mock AIME | 84.4% | Not measured | Only o3 measured |
| FrontierMath, tiers 1 to 3 | 33.3% | Not measured | Only o3 measured |
| ProofBench | Not measured | 22.0% | Only MiMo-V2.5-Pro measured |
| MATH level 5 | 97.8% | Not measured | Only o3 measured |
| LMArena Text: math | 1426 | 1481 | MiMo-V2.5-Pro |
| LMArena Text: mathematical work | 1423 | 1491 | MiMo-V2.5-Pro |
| Neither model has a result on the other 2 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index45
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| MMLU Pro | 85.6% | 84.6% | o3 |
| LegalBench (Vals AI) | 83.8% | 77.1% | o3 |
| CorpFin (Vals AI) | 59.7% | 61.4% | MiMo-V2.5-Pro |
| TaxEval (Vals AI) | 74.6% | 73.8% | o3 |
| MortgageTax (Vals AI) | 65.7% | Not measured | Only o3 measured |
| MedQA (Vals AI) | 96.1% | Not measured | Only o3 measured |
| MedCode (Vals AI) | 47.3% | 32.5% | o3 |
| MMLU Pro (Artificial Analysis run) | 85.3% | Not measured | Only o3 measured |
| SimpleQA Verified | 49.4% | Not measured | Only o3 measured |
| GeoBench | 74.0% | Not measured | Only o3 measured |
| LMArena Text: science | 1429 | 1482 | MiMo-V2.5-Pro |
| LMArena Text: medicine and healthcare | 1448 | 1473 | MiMo-V2.5-Pro |
| LMArena Text: legal and government | 1428 | 1474 | MiMo-V2.5-Pro |
| LMArena Text: business and finance | 1393 | 1466 | MiMo-V2.5-Pro |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| Design Arena: websites | 1036 | 1267 | MiMo-V2.5-Pro |
| Design Arena: UI components | 1016 | 1248 | MiMo-V2.5-Pro |
| Design Arena: game dev | 1034 | 1261 | MiMo-V2.5-Pro |
| Design Arena: data viz | 1200 | 1257 | MiMo-V2.5-Pro |
| Design Arena: 3D | Not measured | 1244 | Only MiMo-V2.5-Pro measured |
| Design Arena: all code categories | 1021 | 1266 | MiMo-V2.5-Pro |
| Design Arena: SVG | Not measured | 1181 | Only MiMo-V2.5-Pro measured |
| Design Arena: ASCII art | Not measured | 1157 | Only MiMo-V2.5-Pro measured |
| Neither model has a result on the other 1 board here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index220
| Benchmark | o3 | MiMo-V2.5-Pro | Leader |
|---|---|---|---|
| SAGE (Vals AI) | 41.8% | Not measured | Only o3 measured |
| MedScribe (Vals AI) | 76.7% | 83.7% | MiMo-V2.5-Pro |
| IFBench | 71.4% | 79.9% | MiMo-V2.5-Pro |
| Long context reasoning (AA-LCR) | 74.7% | 79.7% | MiMo-V2.5-Pro |
| DTBench | 84.8% | 84.5% | o3 |
| LMCA | 39.7% | 29.5% | o3 |
| Fiction.LiveBench | 88.9% | Not measured | Only o3 measured |
| Creative writing (Lech Mazur) | 83.9% | Not measured | Only o3 measured |
| CL-bench | 17.8% | Not measured | Only o3 measured |
| LMArena Text | 1410 | 1464 | MiMo-V2.5-Pro |
| LMArena Text: instruction following | 1368 | 1475 | MiMo-V2.5-Pro |
| LMArena Text: creative writing | 1359 | 1438 | MiMo-V2.5-Pro |
| LMArena Vision | 1214 | Not measured | Only o3 measured |
| LMArena Text: English | 1417 | 1477 | MiMo-V2.5-Pro |
| LMArena Text: non-English | 1401 | 1448 | MiMo-V2.5-Pro |
| LMArena Text: Chinese | 1437 | 1507 | MiMo-V2.5-Pro |
| LMArena Text: German | 1420 | 1459 | MiMo-V2.5-Pro |
| LMArena Text: Japanese | 1403 | 1410 | MiMo-V2.5-Pro |
| LMArena Text: Korean | 1370 | 1435 | MiMo-V2.5-Pro |
| LMArena Text: French | 1430 | 1487 | MiMo-V2.5-Pro |
| LMArena Text: Spanish | 1395 | 1469 | MiMo-V2.5-Pro |
| LMArena Text: Russian | 1406 | 1449 | MiMo-V2.5-Pro |
| LMArena Text: Polish | 1438 | 1464 | MiMo-V2.5-Pro |
| LMArena Text: multi-turn | 1405 | 1476 | MiMo-V2.5-Pro |
| LMArena Text: longer queries | 1372 | 1481 | MiMo-V2.5-Pro |
| LMArena Text: writing and language | 1372 | 1451 | MiMo-V2.5-Pro |
| LMArena Text: entertainment and media | 1373 | 1438 | MiMo-V2.5-Pro |
| LMArena Vision: English | 1221 | Not measured | Only o3 measured |
| LMArena Vision: Chinese | 1237 | Not measured | Only o3 measured |
| LMArena Vision: reading text | 1218 | Not measured | Only o3 measured |
| LMArena Vision: humor | 1222 | Not measured | Only o3 measured |
| LMArena Vision: captioning | 1210 | Not measured | Only o3 measured |
| LMArena Vision: recognizing things | 1234 | Not measured | Only o3 measured |
| LMArena Vision: creative writing | 1201 | Not measured | Only o3 measured |
| Neither model has a result on the other 12 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | o3 | MiMo-V2.5-Pro | 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-Pro costs less
Repository review
50K input + 3K output tokens
MiMo-V2.5-Pro costs less
Agent loop
200K input + 10K output tokens
MiMo-V2.5-Pro 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 | Xiaomi MiMo-V2.5-Pro |
|---|---|---|
| Maker | OpenAI | Xiaomi |
| Weights | No public weights listed | Open weights |
| Released | April 16, 2025 | April 22, 2026 |
| Context window | 200K | 1.05M |
| Input $/Mtok | $2.00 | $0.3045 |
| Output $/Mtok | $8.00 | $0.609 |
| Coding index | 70.7 | 40.0 |
| Independent measurements behind it | 2 | 1 |
| Cost per solved task | $0.571 | $0.03 |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is o3 better than MiMo-V2.5-Pro for coding?
Pick o3 for coding: it scores 70.7 on the Vibe Coding Index against 40.0 for MiMo-V2.5-Pro. Pick MiMo-V2.5-Pro when output tokens cost 13.1x less, or when a solved task costs $0.03 against $0.571.
Which is cheaper, o3 or MiMo-V2.5-Pro?
o3 costs $2.00 per million input tokens and $8.00 per million output tokens; MiMo-V2.5-Pro costs $0.3045 and $0.609. Per solved SWE-bench Verified task, o3 costs $0.571 and MiMo-V2.5-Pro $0.03.
Which has the bigger context window, o3 or MiMo-V2.5-Pro?
MiMo-V2.5-Pro, with 1.05M tokens against 200K.
How many benchmarks is the o3 vs MiMo-V2.5-Pro comparison based on?
51 benchmarks have a result for both models as of October 21, 2026. o3's coding index rests on 2 independent benchmarks and MiMo-V2.5-Pro's on 1. Where only one model has a result, the page says so instead of naming a winner.