Grok 4.5 vs MiMo-V2.6-Flash
Grok 4.5 leads MiMo-V2.6-Flash on coding, 58.6 to 54.7 on the Vibe Coding Index, and MiMo-V2.6-Flash costs 21.4x less per output token ($0.28 vs $6.00 per million). Updated October 21, 2026; 59 benchmarks have a result for both.
Grok 4.5 or MiMo-V2.6-Flash: which to pick
Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 54.7 for MiMo-V2.6-Flash.
Pick MiMo-V2.6-Flash for output tokens 21.4x cheaper ($0.28 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).
- Shared results
- 59
- Grok 4.5 only
- 64
- MiMo-V2.6-Flash only
- 7
- Like-for-like categories
- 7 of 9
Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.
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, six public coding benchmarks
Grok 4.5
Grok 4.5 scores 58.6 against 54.7.
6 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
Grok 4.5
Grok 4.5 leads, 38.8 against 37.9.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only Grok 4.5 has a AA Agentic Index result, 41.2.
Directional only
Reasoning
GPQA Diamond
No call
Only Grok 4.5 has a GPQA Diamond result, 92.9%.
Directional only
Knowledge
MMLU Pro
No call
Only Grok 4.5 has a MMLU Pro result, 89.2%.
Directional only
Web design
Design Arena: websites
No call
Only Grok 4.5 has a Design Arena: websites result, 1281.
Directional only
General
Vals Index
No call
Only MiMo-V2.6-Flash has a Vals Index result, 54.8%.
Directional only
Long documents
Listed context window
MiMo-V2.6-Flash
MiMo-V2.6-Flash takes 1.05M tokens against 500K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
MiMo-V2.6-Flash
Grok 4.5 $0.0050, MiMo-V2.6-Flash $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only Grok 4.5 has the number, $0.62.
Directional only
At a glance
- Coding index
- Grok 4.5 58.6 from 6 benchmarks, MiMo-V2.6-Flash 54.7 from 3 benchmarks.
- Widest category
- Math, 11.8 points apart on average over 3 shared benchmarks.
- Widest single gap
- ProofBench: Grok 4.5 31.0% against MiMo-V2.6-Flash 63.0%, 32.0 points apart on a 0 to 100 scale.
- Output price
- Grok 4.5 $6.00 against MiMo-V2.6-Flash $0.28 per million output tokens, 21.4x apart.
- Context window
- Grok 4.5 takes 500K tokens, MiMo-V2.6-Flash 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 | Grok 4.5 | Bars | MiMo-V2.6-Flash | Ties |
|---|---|---|---|---|
| Coding | 2 | 13 | ||
| Intelligence | 1 | 0 | ||
| Agentic work | 0 | 4 | 1 tie | |
| Reasoning | 3 | 3 | ||
| Math | 1 | 2 | ||
| Knowledge | 4 | 1 | ||
| General | 14 | 10 | ||
| All shared boards | 25 | 33 | 1 tie |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index213
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| LiveBench coding | 94.3% | Not measured | Only Grok 4.5 measured |
| LMArena WebDev | 1553 | 1634 | MiMo-V2.6-Flash |
| AA Coding Index | 72.4 | Not measured | Only Grok 4.5 measured |
| LiveCodeBench (Vals AI) | 87.3% | Not measured | Only Grok 4.5 measured |
| SWE-bench Verified (Vals AI) | 86.6% | Not measured | Only Grok 4.5 measured |
| Terminal-Bench 4 (Vals AI) | 8.6% | 24.2% | MiMo-V2.6-Flash |
| Vibe Code Bench (Vals AI) | 69.0% | 79.0% | MiMo-V2.6-Flash |
| Code migration (Vals AI) | 36.6% | 40.9% | MiMo-V2.6-Flash |
| ProgramBench (Vals AI) | 0.0% | 0.5% | MiMo-V2.6-Flash |
| IOI (Vals AI) | 40.6% | 47.7% | MiMo-V2.6-Flash |
| Terminal-Bench 2.1 (Vals AI) | 67.8% | 76.4% | MiMo-V2.6-Flash |
| SkillsBench (Vals AI) | 66.0% | Not measured | Only Grok 4.5 measured |
| CyberBench (Vals AI) | 71.0% | 75.4% | MiMo-V2.6-Flash |
| SciCode | 55.0% | 51.3% | Grok 4.5 |
| FrontierCode | 42.4% | Not measured | Only Grok 4.5 measured |
| WeirdML | 46.4% | Not measured | Only Grok 4.5 measured |
| ALE-Bench | 1309.3 | 1244.2 | Grok 4.5 |
| LMArena Text: coding | 1474 | 1499 | MiMo-V2.6-Flash |
| LMArena Text: software and IT | 1471 | 1497 | MiMo-V2.6-Flash |
| LMArena WebDev: React | 1556 | 1648 | MiMo-V2.6-Flash |
| LMArena WebDev: HTML | 1567 | 1641 | MiMo-V2.6-Flash |
| LMArena WebDev: from an image | 1562 | 1596 | MiMo-V2.6-Flash |
| SciCode | 6.5% | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 16 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| AA Intelligence Index | 38.8 | 37.9 | Grok 4.5 |
| Epoch Capabilities Index | 154.1 | Not measured | Only Grok 4.5 measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| AA Agentic Index | 41.2 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building web apps | 1218 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building full-stack apps | 1249 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building mobile apps | 1221 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building Android apps | 1242 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building Godot games | 1229 | Not measured | Only Grok 4.5 measured |
| Design Arena: agents building games | 1236 | Not measured | Only Grok 4.5 measured |
| Design Arena: HTML slides | 1204 | Not measured | Only Grok 4.5 measured |
| Design Arena: PowerPoint slides | 1233 | Not measured | Only Grok 4.5 measured |
| LiveBench research | 85.9% | Not measured | Only Grok 4.5 measured |
| LiveBench browser | 44.0% | Not measured | Only Grok 4.5 measured |
| LiveBench long agentic | 27.9% | Not measured | Only Grok 4.5 measured |
| SREBench (Vals AI) | 0.8% | 4.2% | MiMo-V2.6-Flash |
| Finance Agent (Vals AI) | 48.4% | 56.3% | MiMo-V2.6-Flash |
| Tax Agent Bench (Vals AI) | 24.9% | 28.5% | MiMo-V2.6-Flash |
| Legal Research Bench (Vals AI) | 38.0% | 38.0% | Tie |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 13.3% | Only MiMo-V2.6-Flash measured |
| Excel Modeling Benchmark (Vals AI) | 52.9% | 65.5% | MiMo-V2.6-Flash |
| BioMysteryBench (Vals AI) | Not measured | 69.3% | Only MiMo-V2.6-Flash measured |
| Terminal-Bench-Science (Vals AI) | Not measured | 4.3% | Only MiMo-V2.6-Flash measured |
| Vals Science Index | Not measured | 31.7% | Only MiMo-V2.6-Flash measured |
| Time Horizon Index (Vals AI) | 6.3% | Not measured | Only Grok 4.5 measured |
| APEX-Agents | 56.2% | Not measured | Only Grok 4.5 measured |
| PostTrainBench | 23.4% | Not measured | Only Grok 4.5 measured |
| Vending-Bench 2 | $3,887 | Not measured | Only Grok 4.5 measured |
| LMArena Search | 1216 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 15 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index33
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| GPQA Diamond | 92.9% | Not measured | Only Grok 4.5 measured |
| LiveBench reasoning | 87.2% | Not measured | Only Grok 4.5 measured |
| MysteryMechanism (Vals AI) | Not measured | 21.6% | Only MiMo-V2.6-Flash measured |
| MMMU Pro (Vals AI) | 61.8% | Not measured | Only Grok 4.5 measured |
| GPQA Diamond (Artificial Analysis run) | 93.1% | Not measured | Only Grok 4.5 measured |
| Humanity's Last Exam (Artificial Analysis run) | 42.7% | 35.1% | Grok 4.5 |
| GPQA Diamond (Epoch AI run) | 93.4% | Not measured | Only Grok 4.5 measured |
| ARC-AGI | 87.2% | Not measured | Only Grok 4.5 measured |
| ARC-AGI-2 | 52.6% | Not measured | Only Grok 4.5 measured |
| SimpleBench | 70.0% | Not measured | Only Grok 4.5 measured |
| Chess puzzles | 35.0% | Not measured | Only Grok 4.5 measured |
| LMArena Text: hard prompts | 1462 | 1475 | MiMo-V2.6-Flash |
| LMArena Text: expert | 1465 | 1496 | MiMo-V2.6-Flash |
| LMArena Text: hard prompts in English | 1464 | 1493 | MiMo-V2.6-Flash |
| LMArena Vision: diagrams | 1304 | 1276 | Grok 4.5 |
| LMArena Vision: homework | 1295 | 1283 | Grok 4.5 |
| Kagi LLM Benchmark | 83.5% | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 5 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index12
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| OTIS Mock AIME | 97.8% | Not measured | Only Grok 4.5 measured |
| FrontierMath, tiers 1 to 3 | 57.2% | Not measured | Only Grok 4.5 measured |
| FrontierMath, tier 4 | 24.4% | Not measured | Only Grok 4.5 measured |
| ProofBench | 31.0% | 63.0% | MiMo-V2.6-Flash |
| LMArena Text: math | 1460 | 1476 | MiMo-V2.6-Flash |
| LMArena Text: mathematical work | 1482 | 1478 | Grok 4.5 |
| Neither model has a result on the other 7 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| MMLU Pro | 89.2% | Not measured | Only Grok 4.5 measured |
| LegalBench (Vals AI) | 86.0% | Not measured | Only Grok 4.5 measured |
| CorpFin (Vals AI) | 67.4% | Not measured | Only Grok 4.5 measured |
| TaxEval (Vals AI) | 71.7% | Not measured | Only Grok 4.5 measured |
| MortgageTax (Vals AI) | 61.8% | Not measured | Only Grok 4.5 measured |
| MedCode (Vals AI) | 43.3% | 41.1% | Grok 4.5 |
| SimpleQA Verified | 48.3% | Not measured | Only Grok 4.5 measured |
| LMArena Text: science | 1464 | 1462 | Grok 4.5 |
| LMArena Text: medicine and healthcare | 1440 | 1439 | Grok 4.5 |
| LMArena Text: legal and government | 1463 | 1441 | Grok 4.5 |
| LMArena Text: business and finance | 1441 | 1454 | MiMo-V2.6-Flash |
| FACTS Benchmark Suite | 50.2% | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 6 boards here | |||
Web designDirectional onlyPublic boards, shown as published, kept out of the index9 boards, none shared
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| Design Arena: websites | 1281 | Not measured | Only Grok 4.5 measured |
| Design Arena: UI components | 1279 | Not measured | Only Grok 4.5 measured |
| Design Arena: game dev | 1263 | Not measured | Only Grok 4.5 measured |
| Design Arena: data viz | 1266 | Not measured | Only Grok 4.5 measured |
| Design Arena: 3D | 1257 | Not measured | Only Grok 4.5 measured |
| Design Arena: all code categories | 1275 | Not measured | Only Grok 4.5 measured |
| Design Arena: SVG | 1215 | Not measured | Only Grok 4.5 measured |
| Design Arena: ASCII art | 1257 | Not measured | Only Grok 4.5 measured |
| LiveBench design | 78.1% | Not measured | Only Grok 4.5 measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index1410
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| Vals Index | Not measured | 54.8% | Only MiMo-V2.6-Flash measured |
| LiveBench data analysis | 73.0% | Not measured | Only Grok 4.5 measured |
| Public Benefits Bench (Vals AI) | Not measured | 67.6% | Only MiMo-V2.6-Flash measured |
| SAGE (Vals AI) | 35.0% | 43.5% | MiMo-V2.6-Flash |
| MedScribe (Vals AI) | 86.9% | 85.3% | Grok 4.5 |
| Vals Multimodal Index | 63.4% | Not measured | Only Grok 4.5 measured |
| Long context reasoning (AA-LCR) | 79.3% | 74.3% | Grok 4.5 |
| DTBench | 96.5% | Not measured | Only Grok 4.5 measured |
| LMCA | 45.2% | Not measured | Only Grok 4.5 measured |
| Surface Evolver Bench | 74.4% | Not measured | Only Grok 4.5 measured |
| Furniture assembly | 22.5% | Not measured | Only Grok 4.5 measured |
| LMArena Text | 1448 | 1453 | MiMo-V2.6-Flash |
| LMArena Text: instruction following | 1445 | 1452 | MiMo-V2.6-Flash |
| LMArena Text: creative writing | 1442 | 1403 | Grok 4.5 |
| LMArena Vision | 1287 | 1256 | Grok 4.5 |
| LMArena Text: English | 1453 | 1476 | MiMo-V2.6-Flash |
| LMArena Text: non-English | 1440 | 1431 | Grok 4.5 |
| LMArena Text: Chinese | 1495 | 1509 | MiMo-V2.6-Flash |
| LMArena Text: German | 1448 | 1458 | MiMo-V2.6-Flash |
| LMArena Text: Japanese | 1430 | 1359 | Grok 4.5 |
| LMArena Text: Korean | 1406 | 1425 | MiMo-V2.6-Flash |
| LMArena Text: French | 1457 | 1480 | MiMo-V2.6-Flash |
| LMArena Text: Spanish | 1451 | 1453 | MiMo-V2.6-Flash |
| LMArena Text: Russian | 1449 | 1409 | Grok 4.5 |
| LMArena Text: Polish | 1432 | 1455 | MiMo-V2.6-Flash |
| LMArena Text: multi-turn | 1456 | 1447 | Grok 4.5 |
| LMArena Text: longer queries | 1462 | 1459 | Grok 4.5 |
| LMArena Text: writing and language | 1445 | 1424 | Grok 4.5 |
| LMArena Text: entertainment and media | 1434 | 1415 | Grok 4.5 |
| LMArena Vision: English | 1285 | 1269 | Grok 4.5 |
| LMArena Vision: Chinese | 1345 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: reading text | 1293 | 1270 | Grok 4.5 |
| LMArena Vision: humor | 1276 | Not measured | Only Grok 4.5 measured |
| LMArena Vision: creative writing | 1293 | 1231 | Grok 4.5 |
| LMArena Document | 1452 | Not measured | Only Grok 4.5 measured |
| Neither model has a result on the other 11 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | Grok 4.5 | MiMo-V2.6-Flash | 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-V2.6-Flash costs less
Repository review
50K input + 3K output tokens
MiMo-V2.6-Flash costs less
Agent loop
200K input + 10K output tokens
MiMo-V2.6-Flash 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 | SpaceXAI Grok 4.5 | Xiaomi MiMo-V2.6-Flash |
|---|---|---|
| Maker | xAI | Xiaomi |
| Weights | No public weights listed | Open weights |
| Released | July 8, 2026 | September 21, 2026 |
| Context window | 500K | 1.05M |
| Input $/Mtok | $2.00 | $0.14 |
| Output $/Mtok | $6.00 | $0.28 |
| Coding index | 58.6 | 54.7 |
| Independent measurements behind it | 6 | 3 |
| Cost per solved task | $0.62 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is Grok 4.5 better than MiMo-V2.6-Flash for coding?
Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 54.7 for MiMo-V2.6-Flash. Pick MiMo-V2.6-Flash for output tokens 21.4x cheaper ($0.28 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).
Which is cheaper, Grok 4.5 or MiMo-V2.6-Flash?
Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; MiMo-V2.6-Flash costs $0.14 and $0.28. Cost per solved task is known for Grok 4.5 only.
Which has the bigger context window, Grok 4.5 or MiMo-V2.6-Flash?
MiMo-V2.6-Flash, with 1.05M tokens against 500K.
How many benchmarks is the Grok 4.5 vs MiMo-V2.6-Flash comparison based on?
59 benchmarks have a result for both models as of October 21, 2026. Grok 4.5's coding index rests on 6 independent benchmarks and MiMo-V2.6-Flash's on 3. Where only one model has a result, the page says so instead of naming a winner.