GPT-5.4 Nano vs MiMo-V2.6-Flash
MiMo-V2.6-Flash leads GPT-5.4 Nano on coding, 54.7 to 44.8 on the Vibe Coding Index, and MiMo-V2.6-Flash costs 4.5x less per output token ($0.28 vs $1.25 per million). Updated October 22, 2026; 50 benchmarks have a result for both.
GPT-5.4 Nano or MiMo-V2.6-Flash: which to pick
Pick MiMo-V2.6-Flash for coding: it scores 54.7 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano.
Pick GPT-5.4 Nano for work measured by Long context reasoning (AA-LCR), where it leads.
- Shared results
- 50
- GPT-5.4 Nano only
- 35
- MiMo-V2.6-Flash only
- 16
- 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
MiMo-V2.6-Flash
MiMo-V2.6-Flash scores 54.7 against 44.8.
2 and 3 benchmarks behind the scores
Intelligence
AA Intelligence Index
MiMo-V2.6-Flash
MiMo-V2.6-Flash leads, 37.9 against 20.7.
Same board, both measured
Agentic work
AA Agentic Index
No call
Only GPT-5.4 Nano has a AA Agentic Index result, 16.0.
Directional only
Reasoning
GPQA Diamond
No call
Only GPT-5.4 Nano has a GPQA Diamond result, 77.5%.
Directional only
Math
AIME
No call
Only GPT-5.4 Nano has a AIME result, 88.8%.
Directional only
Knowledge
MMLU Pro
No call
Only GPT-5.4 Nano has a MMLU Pro result, 77.2%.
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 400K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
MiMo-V2.6-Flash
GPT-5.4 Nano $0.0008, MiMo-V2.6-Flash $0.0003 per turn.
List prices
Cost per solved task
One SWE-bench Verified task, solved
No call
Only GPT-5.4 Nano has the number, $0.14.
Directional only
At a glance
- Coding index
- GPT-5.4 Nano 44.8 from 2 benchmarks, MiMo-V2.6-Flash 54.7 from 3 benchmarks.
- Widest category
- Math, 27.1 points apart on average over 3 shared benchmarks.
- Widest single gap
- ProofBench: GPT-5.4 Nano 5.0% against MiMo-V2.6-Flash 63.0%, 58.0 points apart on a 0 to 100 scale.
- Output price
- GPT-5.4 Nano $1.25 against MiMo-V2.6-Flash $0.28 per million output tokens, 4.5x apart.
- Context window
- GPT-5.4 Nano takes 400K 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 | GPT-5.4 Nano | Bars | MiMo-V2.6-Flash | Ties |
|---|---|---|---|---|
| Coding | 0 | 7 | ||
| Intelligence | 0 | 1 | ||
| Agentic work | 0 | 4 | ||
| Reasoning | 0 | 6 | ||
| Math | 0 | 3 | ||
| Knowledge | 0 | 5 | ||
| General | 1 | 23 | ||
| All shared boards | 1 | 49 |
CodingLike-for-likeSix of these boards feed the Vibe Coding Index07
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| LMArena WebDev | Not measured | 1634 | Only MiMo-V2.6-Flash measured |
| AA Coding Index | 56.1 | Not measured | Only GPT-5.4 Nano measured |
| LiveCodeBench (Vals AI) | 84.0% | Not measured | Only GPT-5.4 Nano measured |
| SWE-bench Verified (Vals AI) | 69.8% | Not measured | Only GPT-5.4 Nano measured |
| Terminal-Bench 4 (Vals AI) | Not measured | 24.2% | Only MiMo-V2.6-Flash measured |
| Vibe Code Bench (Vals AI) | 26.1% | 79.0% | MiMo-V2.6-Flash |
| Code migration (Vals AI) | 14.5% | 40.9% | MiMo-V2.6-Flash |
| ProgramBench (Vals AI) | Not measured | 0.5% | Only MiMo-V2.6-Flash measured |
| IOI (Vals AI) | Not measured | 47.7% | Only MiMo-V2.6-Flash measured |
| Terminal-Bench 2.1 (Vals AI) | 41.6% | 76.4% | MiMo-V2.6-Flash |
| CyberBench (Vals AI) | Not measured | 75.4% | Only MiMo-V2.6-Flash measured |
| SciCode | 47.2% | 51.3% | MiMo-V2.6-Flash |
| Terminal-Bench Hard (Artificial Analysis run) | 42.4% | Not measured | Only GPT-5.4 Nano measured |
| WeirdML | 49.2% | Not measured | Only GPT-5.4 Nano measured |
| ALE-Bench | 1004.5 | 1244.2 | MiMo-V2.6-Flash |
| LMArena Text: coding | 1404 | 1499 | MiMo-V2.6-Flash |
| LMArena Text: software and IT | 1402 | 1497 | MiMo-V2.6-Flash |
| LMArena WebDev: React | Not measured | 1648 | Only MiMo-V2.6-Flash measured |
| LMArena WebDev: HTML | Not measured | 1641 | Only MiMo-V2.6-Flash measured |
| LMArena WebDev: from an image | Not measured | 1596 | Only MiMo-V2.6-Flash measured |
| Neither model has a result on the other 19 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| AA Intelligence Index | 20.7 | 37.9 | MiMo-V2.6-Flash |
| Epoch Capabilities Index | 146.0 | Not measured | Only GPT-5.4 Nano measured |
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| AA Agentic Index | 16.0 | Not measured | Only GPT-5.4 Nano measured |
| SREBench (Vals AI) | Not measured | 4.2% | Only MiMo-V2.6-Flash measured |
| Finance Agent (Vals AI) | 38.2% | 56.3% | MiMo-V2.6-Flash |
| Tax Agent Bench (Vals AI) | 5.0% | 28.5% | MiMo-V2.6-Flash |
| Legal Research Bench (Vals AI) | 6.3% | 38.0% | MiMo-V2.6-Flash |
| Harvey's Legal Agent Benchmark (Vals AI) | Not measured | 13.3% | Only MiMo-V2.6-Flash measured |
| Excel Modeling Benchmark (Vals AI) | 44.8% | 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 |
| τ²-Bench Telecom | 76.0% | Not measured | Only GPT-5.4 Nano measured |
| Neither model has a result on the other 30 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| GPQA Diamond | 77.5% | Not measured | Only GPT-5.4 Nano measured |
| MysteryMechanism (Vals AI) | Not measured | 21.6% | Only MiMo-V2.6-Flash measured |
| MMMU Pro (Vals AI) | 73.6% | Not measured | Only GPT-5.4 Nano measured |
| GPQA Diamond (Artificial Analysis run) | 81.7% | Not measured | Only GPT-5.4 Nano measured |
| Humanity's Last Exam (Artificial Analysis run) | 28.3% | 35.1% | MiMo-V2.6-Flash |
| GPQA Diamond (Epoch AI run) | 78.5% | Not measured | Only GPT-5.4 Nano measured |
| ARC-AGI | 51.5% | Not measured | Only GPT-5.4 Nano measured |
| ARC-AGI-2 | 5.7% | Not measured | Only GPT-5.4 Nano measured |
| Chess puzzles | 45.0% | Not measured | Only GPT-5.4 Nano measured |
| Mystery game puzzles | 9.0% | Not measured | Only GPT-5.4 Nano measured |
| LMArena Text: hard prompts | 1381 | 1475 | MiMo-V2.6-Flash |
| LMArena Text: expert | 1396 | 1496 | MiMo-V2.6-Flash |
| LMArena Text: hard prompts in English | 1387 | 1493 | MiMo-V2.6-Flash |
| LMArena Vision: diagrams | 1210 | 1276 | MiMo-V2.6-Flash |
| LMArena Vision: homework | 1225 | 1283 | MiMo-V2.6-Flash |
| Kagi LLM Benchmark | 39.7% | Not measured | Only GPT-5.4 Nano measured |
| Neither model has a result on the other 6 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index03
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| AIME | 88.8% | Not measured | Only GPT-5.4 Nano measured |
| OTIS Mock AIME | 87.8% | Not measured | Only GPT-5.4 Nano measured |
| FrontierMath, tiers 1 to 3 | 44.9% | Not measured | Only GPT-5.4 Nano measured |
| FrontierMath, tier 4 | 12.2% | Not measured | Only GPT-5.4 Nano measured |
| ProofBench | 5.0% | 63.0% | MiMo-V2.6-Flash |
| LMArena Text: math | 1405 | 1476 | MiMo-V2.6-Flash |
| LMArena Text: mathematical work | 1409 | 1478 | MiMo-V2.6-Flash |
| Neither model has a result on the other 6 boards here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index05
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| MMLU Pro | 77.2% | Not measured | Only GPT-5.4 Nano measured |
| LegalBench (Vals AI) | 77.9% | Not measured | Only GPT-5.4 Nano measured |
| CaseLaw (Vals AI) | 51.9% | Not measured | Only GPT-5.4 Nano measured |
| CorpFin (Vals AI) | 61.2% | Not measured | Only GPT-5.4 Nano measured |
| TaxEval (Vals AI) | 67.4% | Not measured | Only GPT-5.4 Nano measured |
| MortgageTax (Vals AI) | 59.1% | Not measured | Only GPT-5.4 Nano measured |
| MedCode (Vals AI) | 41.0% | 41.1% | MiMo-V2.6-Flash |
| SimpleQA Verified | 11.7% | Not measured | Only GPT-5.4 Nano measured |
| LMArena Text: science | 1374 | 1462 | MiMo-V2.6-Flash |
| LMArena Text: medicine and healthcare | 1369 | 1439 | MiMo-V2.6-Flash |
| LMArena Text: legal and government | 1368 | 1441 | MiMo-V2.6-Flash |
| LMArena Text: business and finance | 1366 | 1454 | MiMo-V2.6-Flash |
| Neither model has a result on the other 6 boards here | |||
Web designNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| Neither model has a result on 9 boards here | |||
GeneralLike-for-likePublic boards, shown as published, kept out of the index123
| Benchmark | GPT-5.4 Nano | MiMo-V2.6-Flash | Leader |
|---|---|---|---|
| Vals Index | Not measured | 54.8% | Only MiMo-V2.6-Flash measured |
| Public Benefits Bench (Vals AI) | Not measured | 67.6% | Only MiMo-V2.6-Flash measured |
| SAGE (Vals AI) | 38.1% | 43.5% | MiMo-V2.6-Flash |
| MedScribe (Vals AI) | 77.1% | 85.3% | MiMo-V2.6-Flash |
| Vals Multimodal Index | 47.6% | Not measured | Only GPT-5.4 Nano measured |
| IFBench | 75.9% | Not measured | Only GPT-5.4 Nano measured |
| Long context reasoning (AA-LCR) | 76.7% | 74.3% | GPT-5.4 Nano |
| DTBench | 80.3% | Not measured | Only GPT-5.4 Nano measured |
| LMCA | 36.9% | Not measured | Only GPT-5.4 Nano measured |
| LMArena Text | 1372 | 1453 | MiMo-V2.6-Flash |
| LMArena Text: instruction following | 1362 | 1452 | MiMo-V2.6-Flash |
| LMArena Text: creative writing | 1315 | 1403 | MiMo-V2.6-Flash |
| LMArena Vision | 1196 | 1256 | MiMo-V2.6-Flash |
| LMArena Text: English | 1381 | 1476 | MiMo-V2.6-Flash |
| LMArena Text: non-English | 1359 | 1431 | MiMo-V2.6-Flash |
| LMArena Text: Chinese | 1391 | 1509 | MiMo-V2.6-Flash |
| LMArena Text: German | 1368 | 1458 | MiMo-V2.6-Flash |
| LMArena Text: Japanese | 1343 | 1359 | MiMo-V2.6-Flash |
| LMArena Text: Korean | 1321 | 1425 | MiMo-V2.6-Flash |
| LMArena Text: French | 1395 | 1480 | MiMo-V2.6-Flash |
| LMArena Text: Spanish | 1371 | 1453 | MiMo-V2.6-Flash |
| LMArena Text: Russian | 1363 | 1409 | MiMo-V2.6-Flash |
| LMArena Text: Polish | 1366 | 1455 | MiMo-V2.6-Flash |
| LMArena Text: multi-turn | 1382 | 1447 | MiMo-V2.6-Flash |
| LMArena Text: longer queries | 1365 | 1459 | MiMo-V2.6-Flash |
| LMArena Text: writing and language | 1338 | 1424 | MiMo-V2.6-Flash |
| LMArena Text: entertainment and media | 1325 | 1415 | MiMo-V2.6-Flash |
| LMArena Vision: English | 1202 | 1269 | MiMo-V2.6-Flash |
| LMArena Vision: Chinese | 1232 | Not measured | Only GPT-5.4 Nano measured |
| LMArena Vision: reading text | 1204 | 1270 | MiMo-V2.6-Flash |
| LMArena Vision: humor | 1161 | Not measured | Only GPT-5.4 Nano measured |
| LMArena Vision: recognizing things | 1141 | Not measured | Only GPT-5.4 Nano measured |
| LMArena Vision: creative writing | 1159 | 1231 | MiMo-V2.6-Flash |
| 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 | GPT-5.4 Nano | 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 | OpenAI GPT-5.4 Nano | Xiaomi MiMo-V2.6-Flash |
|---|---|---|
| Maker | OpenAI | Xiaomi |
| Weights | No public weights listed | Open weights |
| Released | March 17, 2026 | September 21, 2026 |
| Context window | 400K | 1.05M |
| Input $/Mtok | $0.20 | $0.14 |
| Output $/Mtok | $1.25 | $0.28 |
| Coding index | 44.8 | 54.7 |
| Independent measurements behind it | 2 | 3 |
| Cost per solved task | $0.14 | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-5.4 Nano better than MiMo-V2.6-Flash for coding?
Pick MiMo-V2.6-Flash for coding: it scores 54.7 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano. Pick GPT-5.4 Nano for work measured by Long context reasoning (AA-LCR), where it leads.
Which is cheaper, GPT-5.4 Nano or MiMo-V2.6-Flash?
GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; MiMo-V2.6-Flash costs $0.14 and $0.28. Cost per solved task is known for GPT-5.4 Nano only.
Which has the bigger context window, GPT-5.4 Nano or MiMo-V2.6-Flash?
MiMo-V2.6-Flash, with 1.05M tokens against 400K.
How many benchmarks is the GPT-5.4 Nano vs MiMo-V2.6-Flash comparison based on?
50 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Nano's coding index rests on 2 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.