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GPT-5.4 Mini vs MiMo-V2.6-Flash

Updated October 21, 2026. 53 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-5.4 Mini Replace MiMo-V2.6-Flash
GPT-5.4 MiniOpenAI
Coding
28.2
Overall
24.1
Output $/M
$4.50
6
MiMo-V2.6-FlashXiaomi
Coding
61.9
Overall
37.9
Output $/M
$0.28
47
vs boards won of 53 shared

Decision reading

Pick MiMo-V2.6-Flash for coding: it scores 61.9 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini.

Pick GPT-5.4 Mini when what matters is SciCode or LMArena Vision: homework, where it leads.

Model AGPT-5.4 MiniOpenAI28.2/1001 independent benchmark$0.70 per solved taskModel BMiMo-V2.6-FlashXiaomi61.9/1001 independent benchmarkNo cost per solved task
Shared results
53
GPT-5.4 Mini only
35
MiMo-V2.6-Flash only
13
Like-for-like categories
7 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 28.2 from 1 benchmark, MiMo-V2.6-Flash 61.9 from 1 benchmark.
Widest category
Math, 20.0 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: GPT-5.4 Mini 21.0% against MiMo-V2.6-Flash 63.0%, 42.0 points apart on a 0 to 100 scale.
Output price
GPT-5.4 Mini $4.50 against MiMo-V2.6-Flash $0.28 per million output tokens, 16.1x apart.
Context window
GPT-5.4 Mini 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.

Boards won, where both have a result
CategoryGPT-5.4 MiniBarsMiMo-V2.6-FlashTies
Coding111
Intelligence01
Agentic work04
Reasoning15
Math03
Knowledge04
General419
All shared boards647
CodingLike-for-likeFour of these boards feed the Vibe Coding Index111
Coding benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
LMArena WebDev13971634MiMo-V2.6-Flash
AA Coding Index56.1Not measuredOnly GPT-5.4 Mini measured
LiveCodeBench (Vals AI)81.5%Not measuredOnly GPT-5.4 Mini measured
SWE-bench Verified (Vals AI)73.0%Not measuredOnly GPT-5.4 Mini measured
Terminal-Bench 4 (Vals AI)2.5%24.2%MiMo-V2.6-Flash
Vibe Code Bench (Vals AI)48.0%79.0%MiMo-V2.6-Flash
Code migration (Vals AI)12.9%40.9%MiMo-V2.6-Flash
ProgramBench (Vals AI)0.0%0.5%MiMo-V2.6-Flash
IOI (Vals AI)Not measured47.7%Only MiMo-V2.6-Flash measured
Terminal-Bench 2.1 (Vals AI)54.7%76.4%MiMo-V2.6-Flash
CyberBench (Vals AI)Not measured75.4%Only MiMo-V2.6-Flash measured
SciCode52.1%51.3%GPT-5.4 Mini
Terminal-Bench Hard (Artificial Analysis run)52.3%Not measuredOnly GPT-5.4 Mini measured
FrontierCode27.0%Not measuredOnly GPT-5.4 Mini measured
WeirdML60.3%Not measuredOnly GPT-5.4 Mini measured
ALE-Bench1188.61244.2MiMo-V2.6-Flash
LMArena Text: coding14381499MiMo-V2.6-Flash
LMArena Text: software and IT14361497MiMo-V2.6-Flash
LMArena WebDev: React13861648MiMo-V2.6-Flash
LMArena WebDev: HTML14191641MiMo-V2.6-Flash
LMArena WebDev: from an imageNot measured1596Only MiMo-V2.6-Flash measured
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
AA Intelligence Index24.137.9MiMo-V2.6-Flash
Epoch Capabilities Index148.7Not measuredOnly GPT-5.4 Mini measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index04
Agentic work benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
AA Agentic Index17.9Not measuredOnly GPT-5.4 Mini measured
SREBench (Vals AI)Not measured4.2%Only MiMo-V2.6-Flash measured
Finance Agent (Vals AI)45.4%56.3%MiMo-V2.6-Flash
Tax Agent Bench (Vals AI)8.8%28.5%MiMo-V2.6-Flash
Legal Research Bench (Vals AI)12.5%38.0%MiMo-V2.6-Flash
Harvey's Legal Agent Benchmark (Vals AI)Not measured13.3%Only MiMo-V2.6-Flash measured
Excel Modeling Benchmark (Vals AI)45.4%65.5%MiMo-V2.6-Flash
BioMysteryBench (Vals AI)Not measured69.3%Only MiMo-V2.6-Flash measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only MiMo-V2.6-Flash measured
Vals Science IndexNot measured31.7%Only MiMo-V2.6-Flash measured
τ²-Bench Telecom83.3%Not measuredOnly GPT-5.4 Mini measured
DeepResearch Bench36.3%Not measuredOnly GPT-5.4 Mini measured
Neither model has a result on the other 27 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index15
Reasoning benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
GPQA Diamond83.1%Not measuredOnly GPT-5.4 Mini measured
MysteryMechanism (Vals AI)Not measured21.6%Only MiMo-V2.6-Flash measured
MMMU Pro (Vals AI)79.3%Not measuredOnly GPT-5.4 Mini measured
GPQA Diamond (Artificial Analysis run)87.5%Not measuredOnly GPT-5.4 Mini measured
Humanity's Last Exam (Artificial Analysis run)28.1%35.1%MiMo-V2.6-Flash
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 prompts14241475MiMo-V2.6-Flash
LMArena Text: expert14351496MiMo-V2.6-Flash
LMArena Text: hard prompts in English14201493MiMo-V2.6-Flash
LMArena Vision: diagrams12661276MiMo-V2.6-Flash
LMArena Vision: homework12851283GPT-5.4 Mini
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
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%63.0%MiMo-V2.6-Flash
LMArena Text: math14181476MiMo-V2.6-Flash
LMArena Text: mathematical work14291478MiMo-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 index04
Knowledge benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
MMLU Pro84.5%Not measuredOnly GPT-5.4 Mini measured
CaseLaw (Vals AI)51.7%Not measuredOnly GPT-5.4 Mini measured
CorpFin (Vals AI)60.9%Not measuredOnly GPT-5.4 Mini measured
TaxEval (Vals AI)71.2%Not measuredOnly GPT-5.4 Mini measured
MortgageTax (Vals AI)63.5%Not measuredOnly GPT-5.4 Mini measured
MedCode (Vals AI)Not measured41.1%Only MiMo-V2.6-Flash measured
SimpleQA Verified29.4%Not measuredOnly GPT-5.4 Mini measured
LMArena Text: science14171462MiMo-V2.6-Flash
LMArena Text: medicine and healthcare13951439MiMo-V2.6-Flash
LMArena Text: legal and government14141441MiMo-V2.6-Flash
LMArena Text: business and finance14181454MiMo-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
Web design benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
Neither model has a result on 9 boards here
GeneralLike-for-likePublic boards, shown as published, kept out of the index419
General benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
Vals IndexNot measured54.8%Only MiMo-V2.6-Flash measured
Public Benefits Bench (Vals AI)Not measured67.6%Only MiMo-V2.6-Flash measured
SAGE (Vals AI)50.8%43.5%GPT-5.4 Mini
MedScribe (Vals AI)Not measured85.3%Only MiMo-V2.6-Flash measured
Vals Multimodal Index54.2%Not measuredOnly GPT-5.4 Mini measured
IFBench73.3%Not measuredOnly GPT-5.4 Mini measured
Long context reasoning (AA-LCR)77.0%74.3%GPT-5.4 Mini
DTBench80.0%Not measuredOnly GPT-5.4 Mini measured
LMCA40.8%Not measuredOnly GPT-5.4 Mini measured
LMArena Text14121453MiMo-V2.6-Flash
LMArena Text: instruction following14051452MiMo-V2.6-Flash
LMArena Text: creative writing13701403MiMo-V2.6-Flash
LMArena Vision12451256MiMo-V2.6-Flash
LMArena Text: English14121476MiMo-V2.6-Flash
LMArena Text: non-English14051431MiMo-V2.6-Flash
LMArena Text: Chinese14461509MiMo-V2.6-Flash
LMArena Text: German14081458MiMo-V2.6-Flash
LMArena Text: Japanese13751359GPT-5.4 Mini
LMArena Text: Korean13701425MiMo-V2.6-Flash
LMArena Text: French14411480MiMo-V2.6-Flash
LMArena Text: Spanish14051453MiMo-V2.6-Flash
LMArena Text: Russian14171409GPT-5.4 Mini
LMArena Text: Polish14151455MiMo-V2.6-Flash
LMArena Text: multi-turn14291447MiMo-V2.6-Flash
LMArena Text: longer queries14081459MiMo-V2.6-Flash
LMArena Text: writing and language13931424MiMo-V2.6-Flash
LMArena Text: entertainment and media13731415MiMo-V2.6-Flash
LMArena Vision: English12441269MiMo-V2.6-Flash
LMArena Vision: Chinese1286Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: reading text12531270MiMo-V2.6-Flash
LMArena Vision: humor1235Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: recognizing things1218Not measuredOnly GPT-5.4 Mini measured
LMArena Vision: creative writing12221231MiMo-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
Image generation benchmarks for GPT-5.4 Mini and MiMo-V2.6-Flash
BenchmarkGPT-5.4 MiniMiMo-V2.6-FlashLeader
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-V2.6-Flash$0.0003Fits in one request

MiMo-V2.6-Flash costs less

Repository review

50K input + 3K output tokens

GPT-5.4 Mini$0.051Fits in one request
MiMo-V2.6-Flash$0.0078Fits in one request

MiMo-V2.6-Flash costs less

Agent loop

200K input + 10K output tokens

GPT-5.4 Mini$0.195Fits in one request
MiMo-V2.6-Flash$0.031Fits in one request

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.

Specifications of GPT-5.4 Mini and MiMo-V2.6-Flash
SpecificationOpenAI GPT-5.4 MiniXiaomi MiMo-V2.6-Flash
MakerOpenAIXiaomi
WeightsNo public weights listedOpen weights
ReleasedMarch 17, 2026September 21, 2026
Context window400K1.05M
Input $/Mtok$0.75$0.14
Output $/Mtok$4.50$0.28
Coding index28.261.9
Independent measurements behind it11
Cost per solved task$0.70Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-5.4 Mini better than MiMo-V2.6-Flash for coding?

Pick MiMo-V2.6-Flash for coding: it scores 61.9 on the Vibe Coding Index against 28.2 for GPT-5.4 Mini. Pick GPT-5.4 Mini when what matters is SciCode or LMArena Vision: homework, where it leads.

Which is cheaper, GPT-5.4 Mini or MiMo-V2.6-Flash?

GPT-5.4 Mini costs $0.75 per million input tokens and $4.50 per million output tokens; MiMo-V2.6-Flash costs $0.14 and $0.28. Cost per solved task is known for GPT-5.4 Mini only.

Which has the bigger context window, GPT-5.4 Mini or MiMo-V2.6-Flash?

MiMo-V2.6-Flash, with 1.05M tokens against 400K.

How many benchmarks is the GPT-5.4 Mini vs MiMo-V2.6-Flash comparison based on?

53 benchmarks have a result for both models as of October 21, 2026. GPT-5.4 Mini's coding index rests on 1 independent benchmark and MiMo-V2.6-Flash's on 1. Where only one model has a result, the page says so instead of naming a winner.

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