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GPT-5.4 Nano vs MiMo-V2.5-Pro

GPT-5.4 Nano leads MiMo-V2.5-Pro on coding, 44.8 to 31.6 on the Vibe Coding Index, and MiMo-V2.5-Pro costs 1.4x less per output token ($0.9152 vs $1.25 per million). Updated October 22, 2026; 58 benchmarks have a result for both.

Replace GPT-5.4 Nano Replace MiMo-V2.5-Pro
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
5
MiMo-V2.5-ProXiaomi
Coding
31.6
Overall
39.3
Output $/M
$0.9152
53
vs boards won of 58 shared

GPT-5.4 Nano or MiMo-V2.5-Pro: which to pick

Pick GPT-5.4 Nano for coding: it scores 44.8 on the Vibe Coding Index against 31.6 for MiMo-V2.5-Pro, though on 2 benchmarks against 4.

Pick MiMo-V2.5-Pro for output tokens 1.4x cheaper ($0.9152 vs $1.25 per million) and a lower cost per solved task ($0.03 against $0.14).

Model AGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved taskModel BMiMo-V2.5-ProXiaomi31.6/1004 independent benchmarks$0.03 per solved task
Shared results
58
GPT-5.4 Nano only
27
MiMo-V2.5-Pro only
12
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.

At a glance

Coding index
GPT-5.4 Nano 44.8 from 2 benchmarks, MiMo-V2.5-Pro 31.6 from 4 benchmarks.
Widest category
Math, 14.4 points apart on average over 3 shared benchmarks.
Widest single gap
LMArena Text: creative writing: GPT-5.4 Nano 1315 against MiMo-V2.5-Pro 1438, 20.6 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Nano $1.25 against MiMo-V2.5-Pro $0.9152 per million output tokens, 1.4x apart.
Context window
GPT-5.4 Nano takes 400K 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.

Boards won, where both have a result
CategoryGPT-5.4 NanoBarsMiMo-V2.5-ProTies
Coding29
Intelligence01
Agentic work06
Reasoning06
Math03
Knowledge27
General121
All shared boards553
CodingLike-for-likeSix of these boards feed the Vibe Coding Index29
Coding benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
LMArena WebDevNot measured1480Only MiMo-V2.5-Pro measured
AA Coding Index56.160.2MiMo-V2.5-Pro
LiveCodeBench (Vals AI)84.0%81.3%GPT-5.4 Nano
SWE-bench Verified (Vals AI)69.8%74.0%MiMo-V2.5-Pro
Terminal-Bench 4 (Vals AI)Not measured0.5%Only MiMo-V2.5-Pro measured
Vibe Code Bench (Vals AI)26.1%34.1%MiMo-V2.5-Pro
Code migration (Vals AI)14.5%21.6%MiMo-V2.5-Pro
Terminal-Bench 2.1 (Vals AI)41.6%57.3%MiMo-V2.5-Pro
SciCode47.2%50.6%MiMo-V2.5-Pro
Terminal-Bench Hard (Artificial Analysis run)42.4%43.2%MiMo-V2.5-Pro
WeirdML49.2%Not measuredOnly GPT-5.4 Nano measured
ALE-Bench1004.5899.8GPT-5.4 Nano
LMArena Text: coding14041501MiMo-V2.5-Pro
LMArena Text: software and IT14021495MiMo-V2.5-Pro
LMArena WebDev: ReactNot measured1469Only MiMo-V2.5-Pro measured
LMArena WebDev: HTMLNot measured1473Only MiMo-V2.5-Pro measured
Neither model has a result on the other 23 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
AA Intelligence Index20.726.0MiMo-V2.5-Pro
Epoch Capabilities Index146.0Not measuredOnly GPT-5.4 Nano measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index06
Agentic work benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
AA Agentic Index16.021.3MiMo-V2.5-Pro
Finance Agent (Vals AI)38.2%41.5%MiMo-V2.5-Pro
Tax Agent Bench (Vals AI)5.0%11.5%MiMo-V2.5-Pro
Legal Research Bench (Vals AI)6.3%15.9%MiMo-V2.5-Pro
Excel Modeling Benchmark (Vals AI)44.8%55.2%MiMo-V2.5-Pro
τ²-Bench Telecom76.0%94.2%MiMo-V2.5-Pro
Neither model has a result on the other 35 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index06
Reasoning benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
GPQA Diamond77.5%82.6%MiMo-V2.5-Pro
MMMU Pro (Vals AI)73.6%Not measuredOnly GPT-5.4 Nano measured
GPQA Diamond (Artificial Analysis run)81.7%86.6%MiMo-V2.5-Pro
Humanity's Last Exam (Artificial Analysis run)28.3%35.7%MiMo-V2.5-Pro
GPQA Diamond (Epoch AI run)78.5%Not measuredOnly GPT-5.4 Nano measured
ARC-AGI51.5%Not measuredOnly GPT-5.4 Nano measured
ARC-AGI-25.7%Not measuredOnly GPT-5.4 Nano measured
Chess puzzles45.0%Not measuredOnly GPT-5.4 Nano measured
Mystery game puzzles9.0%Not measuredOnly GPT-5.4 Nano measured
LMArena Text: hard prompts13811486MiMo-V2.5-Pro
LMArena Text: expert13961501MiMo-V2.5-Pro
LMArena Text: hard prompts in English13871494MiMo-V2.5-Pro
LMArena Vision: diagrams1210Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: homework1225Not measuredOnly GPT-5.4 Nano measured
Kagi LLM Benchmark39.7%Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
AIME88.8%Not measuredOnly GPT-5.4 Nano measured
OTIS Mock AIME87.8%Not measuredOnly GPT-5.4 Nano measured
FrontierMath, tiers 1 to 344.9%Not measuredOnly GPT-5.4 Nano measured
FrontierMath, tier 412.2%Not measuredOnly GPT-5.4 Nano measured
ProofBench5.0%22.0%MiMo-V2.5-Pro
LMArena Text: math14051481MiMo-V2.5-Pro
LMArena Text: mathematical work14091491MiMo-V2.5-Pro
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index27
Knowledge benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
MMLU Pro77.2%84.6%MiMo-V2.5-Pro
LegalBench (Vals AI)77.9%77.1%GPT-5.4 Nano
CaseLaw (Vals AI)51.9%Not measuredOnly GPT-5.4 Nano measured
CorpFin (Vals AI)61.2%61.4%MiMo-V2.5-Pro
TaxEval (Vals AI)67.4%73.8%MiMo-V2.5-Pro
MortgageTax (Vals AI)59.1%Not measuredOnly GPT-5.4 Nano measured
MedCode (Vals AI)41.0%32.5%GPT-5.4 Nano
SimpleQA Verified11.7%Not measuredOnly GPT-5.4 Nano measured
LMArena Text: science13741482MiMo-V2.5-Pro
LMArena Text: medicine and healthcare13691473MiMo-V2.5-Pro
LMArena Text: legal and government13681474MiMo-V2.5-Pro
LMArena Text: business and finance13661466MiMo-V2.5-Pro
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
Design Arena: websitesNot measured1266Only MiMo-V2.5-Pro measured
Design Arena: UI componentsNot measured1246Only MiMo-V2.5-Pro measured
Design Arena: game devNot measured1261Only MiMo-V2.5-Pro measured
Design Arena: data vizNot measured1257Only MiMo-V2.5-Pro measured
Design Arena: 3DNot measured1243Only MiMo-V2.5-Pro measured
Design Arena: all code categoriesNot measured1265Only MiMo-V2.5-Pro measured
Design Arena: SVGNot measured1181Only MiMo-V2.5-Pro measured
Design Arena: ASCII artNot measured1156Only 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 index121
General benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
SAGE (Vals AI)38.1%Not measuredOnly GPT-5.4 Nano measured
MedScribe (Vals AI)77.1%83.7%MiMo-V2.5-Pro
Vals Multimodal Index47.6%Not measuredOnly GPT-5.4 Nano measured
IFBench75.9%79.9%MiMo-V2.5-Pro
Long context reasoning (AA-LCR)76.7%79.7%MiMo-V2.5-Pro
DTBench80.3%84.5%MiMo-V2.5-Pro
LMCA36.9%29.5%GPT-5.4 Nano
LMArena Text13721464MiMo-V2.5-Pro
LMArena Text: instruction following13621475MiMo-V2.5-Pro
LMArena Text: creative writing13151438MiMo-V2.5-Pro
LMArena Vision1196Not measuredOnly GPT-5.4 Nano measured
LMArena Text: English13811477MiMo-V2.5-Pro
LMArena Text: non-English13591448MiMo-V2.5-Pro
LMArena Text: Chinese13911507MiMo-V2.5-Pro
LMArena Text: German13681459MiMo-V2.5-Pro
LMArena Text: Japanese13431410MiMo-V2.5-Pro
LMArena Text: Korean13211435MiMo-V2.5-Pro
LMArena Text: French13951487MiMo-V2.5-Pro
LMArena Text: Spanish13711469MiMo-V2.5-Pro
LMArena Text: Russian13631449MiMo-V2.5-Pro
LMArena Text: Polish13661464MiMo-V2.5-Pro
LMArena Text: multi-turn13821476MiMo-V2.5-Pro
LMArena Text: longer queries13651481MiMo-V2.5-Pro
LMArena Text: writing and language13381451MiMo-V2.5-Pro
LMArena Text: entertainment and media13251438MiMo-V2.5-Pro
LMArena Vision: English1202Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: Chinese1232Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: reading text1204Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: humor1161Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: recognizing things1141Not measuredOnly GPT-5.4 Nano measured
LMArena Vision: creative writing1159Not measuredOnly GPT-5.4 Nano measured
Neither model has a result on the other 15 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-5.4 Nano and MiMo-V2.5-Pro
BenchmarkGPT-5.4 NanoMiMo-V2.5-ProLeader
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

GPT-5.4 Nano$0.0008Fits in one request
MiMo-V2.5-Pro$0.0009Fits in one request

GPT-5.4 Nano costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Nano$0.014Fits in one request
MiMo-V2.5-Pro$0.026Fits in one request

GPT-5.4 Nano costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Nano$0.052Fits in one request
MiMo-V2.5-Pro$0.101Fits in one request

GPT-5.4 Nano 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.

Specifications of GPT-5.4 Nano and MiMo-V2.5-Pro
SpecificationOpenAI GPT-5.4 NanoXiaomi MiMo-V2.5-Pro
MakerOpenAIXiaomi
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026April 22, 2026
Context window400K1.05M
Input $/Mtok$0.20$0.4575
Output $/Mtok$1.25$0.9152
Coding index44.831.6
Independent measurements behind it24
Cost per solved task$0.14$0.03
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Nano better than MiMo-V2.5-Pro for coding?

Pick GPT-5.4 Nano for coding: it scores 44.8 on the Vibe Coding Index against 31.6 for MiMo-V2.5-Pro, though on 2 benchmarks against 4. Pick MiMo-V2.5-Pro for output tokens 1.4x cheaper ($0.9152 vs $1.25 per million) and a lower cost per solved task ($0.03 against $0.14).

Which is cheaper, GPT-5.4 Nano or MiMo-V2.5-Pro?

GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; MiMo-V2.5-Pro costs $0.4575 and $0.9152. Per solved SWE-bench Verified task, GPT-5.4 Nano costs $0.14 and MiMo-V2.5-Pro $0.03.

Which has the bigger context window, GPT-5.4 Nano or MiMo-V2.5-Pro?

MiMo-V2.5-Pro, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.4 Nano vs MiMo-V2.5-Pro comparison based on?

58 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-V2.5-Pro's on 4. Where only one model has a result, the page says so instead of naming a winner.

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