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GPT-5.4 Mini vs MiMo-V2.5

MiMo-V2.5 leads GPT-5.4 Mini on coding, 50.0 to 35.8 on the Vibe Coding Index, and MiMo-V2.5 costs 13.4x less per output token ($0.336 vs $4.50 per million). Updated October 22, 2026; 69 benchmarks have a result for both.

Replace GPT-5.4 Mini Replace MiMo-V2.5
GPT-5.4 MiniOpenAI
Coding
35.8
Overall
44.0
Output $/M
$4.50
29
MiMo-V2.5Xiaomi
Coding
50.0
Overall
50.7
Output $/M
$0.336
40
vs boards won of 69 shared

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

Pick MiMo-V2.5 for coding: it scores 50.0 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini, though on 3 benchmarks against 5.

Pick GPT-5.4 Mini for work measured by SWE-bench Verified (Vals AI) or Vibe Code Bench (Vals AI), where it leads.

Model AGPT-5.4 MiniOpenAI35.8/1005 independent benchmarks$0.70 per solved taskModel BMiMo-V2.5Xiaomi50.0/1003 independent benchmarks$0.01 per solved task
Shared results
69
GPT-5.4 Mini only
20
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 Mini 35.8 from 5 benchmarks, MiMo-V2.5 50.0 from 3 benchmarks.
Widest category
Coding, 5.8 points apart on average over 14 shared benchmarks.
Widest single gap
ALE-Bench: GPT-5.4 Mini 1188.6 against MiMo-V2.5 514.0, 22.5 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against MiMo-V2.5 $0.336 per million output tokens, 13.4x apart.
Context window
GPT-5.4 Mini 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 MiniBarsMiMo-V2.5Ties
Coding59
Intelligence10
Agentic work42
Reasoning45
Math12
Knowledge35
General1117
All shared boards2940
CodingLike-for-likeSix of these boards feed the Vibe Coding Index59
Coding benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
LMArena WebDev13971438MiMo-V2.5
AA Coding Index56.156.8MiMo-V2.5
LiveCodeBench (Vals AI)81.5%81.5%MiMo-V2.5
SWE-bench Verified (Vals AI)73.0%71.0%GPT-5.4 Mini
Terminal-Bench 4 (Vals AI)2.5%Not measuredOnly GPT-5.4 Mini measured
Vibe Code Bench (Vals AI)48.0%42.2%GPT-5.4 Mini
Code migration (Vals AI)12.9%14.2%MiMo-V2.5
ProgramBench (Vals AI)0.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 2.1 (Vals AI)54.7%60.7%MiMo-V2.5
SciCode52.1%43.9%GPT-5.4 Mini
Terminal-Bench Hard (Artificial Analysis run)52.3%41.7%GPT-5.4 Mini
FrontierCode27.0%Not measuredOnly GPT-5.4 Mini measured
WeirdML60.3%Not measuredOnly GPT-5.4 Mini measured
ALE-Bench1188.6514.0GPT-5.4 Mini
LMArena Text: coding14381469MiMo-V2.5
LMArena Text: software and IT14361463MiMo-V2.5
LMArena WebDev: React13861425MiMo-V2.5
LMArena WebDev: HTML14191429MiMo-V2.5
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
AA Intelligence Index24.121.8GPT-5.4 Mini
Epoch Capabilities Index148.7Not measuredOnly GPT-5.4 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index42
Agentic work benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
AA Agentic Index17.915.8GPT-5.4 Mini
Finance Agent (Vals AI)45.4%36.7%GPT-5.4 Mini
Tax Agent Bench (Vals AI)8.8%7.8%GPT-5.4 Mini
Legal Research Bench (Vals AI)12.5%9.1%GPT-5.4 Mini
Excel Modeling Benchmark (Vals AI)45.4%55.1%MiMo-V2.5
τ²-Bench Telecom83.3%90.6%MiMo-V2.5
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 34 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index45
Reasoning benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
GPQA Diamond83.1%81.6%GPT-5.4 Mini
MMMU Pro (Vals AI)79.3%80.0%MiMo-V2.5
GPQA Diamond (Artificial Analysis run)87.5%84.9%GPT-5.4 Mini
Humanity's Last Exam (Artificial Analysis run)28.1%27.2%GPT-5.4 Mini
GPQA Diamond (Epoch AI run)86.9%Not measuredOnly GPT-5.4 Mini measured
ARC-AGI63.7%Not measuredOnly GPT-5.4 Mini measured
ARC-AGI-218.9%Not measuredOnly GPT-5.4 Mini measured
Chess puzzles23.0%Not measuredOnly GPT-5.4 Mini measured
Mystery game puzzles11.0%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: hard prompts14241450MiMo-V2.5
LMArena Text: expert14351459MiMo-V2.5
LMArena Text: hard prompts in English14201461MiMo-V2.5
LMArena Vision: diagrams12661269MiMo-V2.5
LMArena Vision: homework12851262GPT-5.4 Mini
Kagi LLM Benchmark37.9%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index12
Math benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
AIME95.6%Not measuredOnly GPT-5.4 Mini measured
OTIS Mock AIME88.9%Not measuredOnly GPT-5.4 Mini measured
FrontierMath, tiers 1 to 351.2%Not measuredOnly GPT-5.4 Mini measured
FrontierMath, tier 49.8%Not measuredOnly GPT-5.4 Mini measured
ProofBench21.0%16.0%GPT-5.4 Mini
LMArena Text: math14181436MiMo-V2.5
LMArena Text: mathematical work14291451MiMo-V2.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index35
Knowledge benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
MMLU Pro84.5%82.9%GPT-5.4 Mini
LegalBench (Vals AI)Not measured78.9%Only MiMo-V2.5 measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%59.9%GPT-5.4 Mini
TaxEval (Vals AI)71.2%71.8%MiMo-V2.5
MortgageTax (Vals AI)63.5%59.3%GPT-5.4 Mini
MedCode (Vals AI)Not measured31.9%Only MiMo-V2.5 measured
SimpleQA Verified29.4%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: science14171440MiMo-V2.5
LMArena Text: medicine and healthcare13951432MiMo-V2.5
LMArena Text: legal and government14141425MiMo-V2.5
LMArena Text: business and finance14181432MiMo-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 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-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 index1117
General benchmarks for GPT-5.4 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-V2.5Leader
SAGE (Vals AI)50.8%43.3%GPT-5.4 Mini
MedScribe (Vals AI)Not measured72.2%Only MiMo-V2.5 measured
Vals Multimodal Index54.2%52.8%GPT-5.4 Mini
IFBench73.3%67.1%GPT-5.4 Mini
Long context reasoning (AA-LCR)77.0%73.0%GPT-5.4 Mini
DTBench80.0%Not measuredOnly GPT-5.4 Mini measured
LMCA40.8%Not measuredOnly GPT-5.4 Mini measured
LMArena Text14121428MiMo-V2.5
LMArena Text: instruction following14051435MiMo-V2.5
LMArena Text: creative writing13701393MiMo-V2.5
LMArena Vision12451247MiMo-V2.5
LMArena Text: English14121447MiMo-V2.5
LMArena Text: non-English14051405GPT-5.4 Mini
LMArena Text: Chinese14461469MiMo-V2.5
LMArena Text: German14081421MiMo-V2.5
LMArena Text: Japanese13751306GPT-5.4 Mini
LMArena Text: Korean13701361GPT-5.4 Mini
LMArena Text: French14411448MiMo-V2.5
LMArena Text: Spanish14051414MiMo-V2.5
LMArena Text: Russian14171396GPT-5.4 Mini
LMArena Text: Polish14151413GPT-5.4 Mini
LMArena Text: multi-turn14291445MiMo-V2.5
LMArena Text: longer queries14081445MiMo-V2.5
LMArena Text: writing and language13931409MiMo-V2.5
LMArena Text: entertainment and media13731399MiMo-V2.5
LMArena Vision: English12441259MiMo-V2.5
LMArena Vision: Chinese12861326MiMo-V2.5
LMArena Vision: reading text12531256MiMo-V2.5
LMArena Vision: humor12351226GPT-5.4 Mini
LMArena Vision: recognizing things12181189GPT-5.4 Mini
LMArena Vision: creative writing12221230MiMo-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 Mini and MiMo-V2.5
BenchmarkGPT-5.4 MiniMiMo-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 Mini$0.0030Fits 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 Mini$0.051Fits 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 Mini$0.195Fits 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 Mini and MiMo-V2.5
SpecificationOpenAI GPT-5.4 MiniXiaomi MiMo-V2.5
MakerOpenAIXiaomi
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026April 22, 2026
Context window400K1.05M
Input $/Mtok$0.75$0.168
Output $/Mtok$4.50$0.336
Coding index35.850.0
Independent measurements behind it53
Cost per solved task$0.70$0.01
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick MiMo-V2.5 for coding: it scores 50.0 on the Vibe Coding Index against 35.8 for GPT-5.4 Mini, though on 3 benchmarks against 5. Pick GPT-5.4 Mini for work measured by SWE-bench Verified (Vals AI) or Vibe Code Bench (Vals AI), where it leads.

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

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; MiMo-V2.5 costs $0.168 and $0.336. Per solved SWE-bench Verified task, GPT-5.4 Mini costs $0.70 and MiMo-V2.5 $0.01.

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

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

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

69 benchmarks have a result for both models as of October 22, 2026. GPT-5.4 Mini's coding index rests on 5 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-mini-vs-xiaomi-mimo-v2-5">LLMBenchmark.ai, GPT-5.4 Mini vs MiMo-V2.5</a></p>