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GPT-5.4 Nano vs MiMo-V2.5

MiMo-V2.5 leads GPT-5.4 Nano on coding, 50.0 to 44.8 on the Vibe Coding Index, and MiMo-V2.5 costs 3.7x less per output token ($0.336 vs $1.25 per million). Updated October 22, 2026; 69 benchmarks have a result for both.

Replace GPT-5.4 Nano Replace MiMo-V2.5
GPT-5.4 NanoOpenAI
Coding
44.8
Overall
45.7
Output $/M
$1.25
14
MiMo-V2.5Xiaomi
Coding
50.0
Overall
50.7
Output $/M
$0.336
55
vs boards won of 69 shared

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

Pick MiMo-V2.5 for coding: it scores 50.0 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano.

Pick GPT-5.4 Nano for work measured by LiveCodeBench (Vals AI) or Code migration (Vals AI), where it leads.

Model AGPT-5.4 NanoOpenAI44.8/1002 independent benchmarks$0.14 per solved taskModel BMiMo-V2.5Xiaomi50.0/1003 independent benchmarks$0.01 per solved task
Shared results
69
GPT-5.4 Nano only
16
MiMo-V2.5 only
11
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 50.0 from 3 benchmarks.
Widest category
General, 9.2 points apart on average over 29 shared benchmarks.
Widest single gap
Terminal-Bench 2.1 (Vals AI): GPT-5.4 Nano 41.6% against MiMo-V2.5 60.7%, 19.1 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Nano $1.25 against MiMo-V2.5 $0.336 per million output tokens, 3.7x apart.
Context window
GPT-5.4 Nano takes 400K 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.

Boards won, where both have a result
CategoryGPT-5.4 NanoBarsMiMo-V2.5Ties
Coding56
Intelligence01
Agentic work24
Reasoning18
Math03
Knowledge28
General425
All shared boards1455
CodingLike-for-likeSix of these boards feed the Vibe Coding Index56
Coding benchmarks for GPT-5.4 Nano and MiMo-V2.5
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
LMArena WebDevNot measured1438Only MiMo-V2.5 measured
AA Coding Index56.156.8MiMo-V2.5
LiveCodeBench (Vals AI)84.0%81.5%GPT-5.4 Nano
SWE-bench Verified (Vals AI)69.8%71.0%MiMo-V2.5
Vibe Code Bench (Vals AI)26.1%42.2%MiMo-V2.5
Code migration (Vals AI)14.5%14.2%GPT-5.4 Nano
Terminal-Bench 2.1 (Vals AI)41.6%60.7%MiMo-V2.5
SciCode47.2%43.9%GPT-5.4 Nano
Terminal-Bench Hard (Artificial Analysis run)42.4%41.7%GPT-5.4 Nano
WeirdML49.2%Not measuredOnly GPT-5.4 Nano measured
ALE-Bench1004.5514.0GPT-5.4 Nano
LMArena Text: coding14041469MiMo-V2.5
LMArena Text: software and IT14021463MiMo-V2.5
LMArena WebDev: ReactNot measured1425Only MiMo-V2.5 measured
LMArena WebDev: HTMLNot measured1429Only MiMo-V2.5 measured
Neither model has a result on the other 24 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
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
AA Intelligence Index20.721.8MiMo-V2.5
Epoch Capabilities Index146.0Not measuredOnly GPT-5.4 Nano measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index24
Agentic work benchmarks for GPT-5.4 Nano and MiMo-V2.5
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
AA Agentic Index16.015.8GPT-5.4 Nano
Finance Agent (Vals AI)38.2%36.7%GPT-5.4 Nano
Tax Agent Bench (Vals AI)5.0%7.8%MiMo-V2.5
Legal Research Bench (Vals AI)6.3%9.1%MiMo-V2.5
Excel Modeling Benchmark (Vals AI)44.8%55.1%MiMo-V2.5
τ²-Bench Telecom76.0%90.6%MiMo-V2.5
Neither model has a result on the other 35 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index18
Reasoning benchmarks for GPT-5.4 Nano and MiMo-V2.5
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
GPQA Diamond77.5%81.6%MiMo-V2.5
MMMU Pro (Vals AI)73.6%80.0%MiMo-V2.5
GPQA Diamond (Artificial Analysis run)81.7%84.9%MiMo-V2.5
Humanity's Last Exam (Artificial Analysis run)28.3%27.2%GPT-5.4 Nano
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 prompts13811450MiMo-V2.5
LMArena Text: expert13961459MiMo-V2.5
LMArena Text: hard prompts in English13871461MiMo-V2.5
LMArena Vision: diagrams12101269MiMo-V2.5
LMArena Vision: homework12251262MiMo-V2.5
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
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
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%16.0%MiMo-V2.5
LMArena Text: math14051436MiMo-V2.5
LMArena Text: mathematical work14091451MiMo-V2.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index28
Knowledge benchmarks for GPT-5.4 Nano and MiMo-V2.5
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
MMLU Pro77.2%82.9%MiMo-V2.5
LegalBench (Vals AI)77.9%78.9%MiMo-V2.5
CaseLaw (Vals AI)51.9%Not measuredOnly GPT-5.4 Nano measured
CorpFin (Vals AI)61.2%59.9%GPT-5.4 Nano
TaxEval (Vals AI)67.4%71.8%MiMo-V2.5
MortgageTax (Vals AI)59.1%59.3%MiMo-V2.5
MedCode (Vals AI)41.0%31.9%GPT-5.4 Nano
SimpleQA Verified11.7%Not measuredOnly GPT-5.4 Nano measured
LMArena Text: science13741440MiMo-V2.5
LMArena Text: medicine and healthcare13691432MiMo-V2.5
LMArena Text: legal and government13681425MiMo-V2.5
LMArena Text: business and finance13661432MiMo-V2.5
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
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
Design Arena: websitesNot measured1265Only MiMo-V2.5 measured
Design Arena: UI componentsNot measured1255Only MiMo-V2.5 measured
Design Arena: game devNot measured1249Only MiMo-V2.5 measured
Design Arena: data vizNot measured1250Only MiMo-V2.5 measured
Design Arena: 3DNot measured1215Only MiMo-V2.5 measured
Design Arena: all code categoriesNot measured1260Only MiMo-V2.5 measured
Design Arena: SVGNot measured1179Only MiMo-V2.5 measured
Design Arena: ASCII artNot measured1140Only 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 index425
General benchmarks for GPT-5.4 Nano and MiMo-V2.5
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
SAGE (Vals AI)38.1%43.3%MiMo-V2.5
MedScribe (Vals AI)77.1%72.2%GPT-5.4 Nano
Vals Multimodal Index47.6%52.8%MiMo-V2.5
IFBench75.9%67.1%GPT-5.4 Nano
Long context reasoning (AA-LCR)76.7%73.0%GPT-5.4 Nano
DTBench80.3%Not measuredOnly GPT-5.4 Nano measured
LMCA36.9%Not measuredOnly GPT-5.4 Nano measured
LMArena Text13721428MiMo-V2.5
LMArena Text: instruction following13621435MiMo-V2.5
LMArena Text: creative writing13151393MiMo-V2.5
LMArena Vision11961247MiMo-V2.5
LMArena Text: English13811447MiMo-V2.5
LMArena Text: non-English13591405MiMo-V2.5
LMArena Text: Chinese13911469MiMo-V2.5
LMArena Text: German13681421MiMo-V2.5
LMArena Text: Japanese13431306GPT-5.4 Nano
LMArena Text: Korean13211361MiMo-V2.5
LMArena Text: French13951448MiMo-V2.5
LMArena Text: Spanish13711414MiMo-V2.5
LMArena Text: Russian13631396MiMo-V2.5
LMArena Text: Polish13661413MiMo-V2.5
LMArena Text: multi-turn13821445MiMo-V2.5
LMArena Text: longer queries13651445MiMo-V2.5
LMArena Text: writing and language13381409MiMo-V2.5
LMArena Text: entertainment and media13251399MiMo-V2.5
LMArena Vision: English12021259MiMo-V2.5
LMArena Vision: Chinese12321326MiMo-V2.5
LMArena Vision: reading text12041256MiMo-V2.5
LMArena Vision: humor11611226MiMo-V2.5
LMArena Vision: recognizing things11411189MiMo-V2.5
LMArena Vision: creative writing11591230MiMo-V2.5
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
BenchmarkGPT-5.4 NanoMiMo-V2.5Leader
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$0.0003Fits in one request

MiMo-V2.5 costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Nano$0.014Fits in one request
MiMo-V2.5$0.0094Fits in one request

MiMo-V2.5 costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Nano$0.052Fits in one request
MiMo-V2.5$0.037Fits in one request

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.

Specifications of GPT-5.4 Nano and MiMo-V2.5
SpecificationOpenAI GPT-5.4 NanoXiaomi MiMo-V2.5
MakerOpenAIXiaomi
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026April 22, 2026
Context window400K1.05M
Input $/Mtok$0.20$0.168
Output $/Mtok$1.25$0.336
Coding index44.850.0
Independent measurements behind it23
Cost per solved task$0.14$0.01
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick MiMo-V2.5 for coding: it scores 50.0 on the Vibe Coding Index against 44.8 for GPT-5.4 Nano. Pick GPT-5.4 Nano for work measured by LiveCodeBench (Vals AI) or Code migration (Vals AI), where it leads.

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

GPT-5.4 Nano costs $0.20 per million input tokens and $1.25 per million output tokens; MiMo-V2.5 costs $0.168 and $0.336. Per solved SWE-bench Verified task, GPT-5.4 Nano costs $0.14 and MiMo-V2.5 $0.01.

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

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

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

69 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's on 3. Where only one model has a result, the page says so instead of naming a winner.

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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-5-4-nano-vs-xiaomi-mimo-v2-5">LLMBenchmark.ai, GPT-5.4 Nano vs MiMo-V2.5</a></p>