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Grok 4.3 vs MiMo-V2.5

Updated October 21, 2026. 80 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Grok 4.3 Replace MiMo-V2.5
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
23
MiMo-V2.5Xiaomi
Coding
34.0
Overall
21.8
Output $/M
$0.238
57
vs boards won of 80 shared

Decision reading

Pick MiMo-V2.5 for coding: it scores 34.0 on the Vibe Coding Index against 22.5 for Grok 4.3.

Pick Grok 4.3 when what matters is LiveCodeBench (Vals AI) or SWE-bench Verified (Vals AI), where it leads.

Model AGrok 4.3xAI22.5/1001 independent benchmark$0.31 per solved taskModel BMiMo-V2.5Xiaomi34.0/1001 independent benchmark$0.01 per solved task
Shared results
80
Grok 4.3 only
24
MiMo-V2.5 only
0
Like-for-like categories
8 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
Grok 4.3 22.5 from 1 benchmark, MiMo-V2.5 34.0 from 1 benchmark.
Widest category
Coding, 10.0 points apart on average over 14 shared benchmarks.
Widest single gap
Excel Modeling Benchmark (Vals AI): Grok 4.3 18.4% against MiMo-V2.5 55.1%, 36.7 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against MiMo-V2.5 $0.238 per million output tokens, 10.5x apart.
Context window
Grok 4.3 takes 1M 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
CategoryGrok 4.3BarsMiMo-V2.5Ties
Coding410
Intelligence10
Agentic work33
Reasoning45
Math03
Knowledge46
Web design08
General722
All shared boards2357
CodingLike-for-likeFour of these boards feed the Vibe Coding Index410
Coding benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
LMArena WebDev13581438MiMo-V2.5
AA Coding Index42.256.8MiMo-V2.5
LiveCodeBench (Vals AI)84.5%81.5%Grok 4.3
SWE-bench Verified (Vals AI)71.4%71.0%Grok 4.3
Vibe Code Bench (Vals AI)19.4%42.2%MiMo-V2.5
Code migration (Vals AI)6.8%14.2%MiMo-V2.5
ProgramBench (Vals AI)0.0%Not measuredOnly Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)42.0%60.7%MiMo-V2.5
SkillsBench (Vals AI)40.6%Not measuredOnly Grok 4.3 measured
SciCode48.3%43.9%Grok 4.3
Terminal-Bench Hard (Artificial Analysis run)37.9%41.7%MiMo-V2.5
WeirdML49.9%Not measuredOnly Grok 4.3 measured
ALE-Bench944.2514.0Grok 4.3
LMArena Text: coding14151469MiMo-V2.5
LMArena Text: software and IT14161463MiMo-V2.5
LMArena WebDev: React13531425MiMo-V2.5
LMArena WebDev: HTML13671429MiMo-V2.5
LMArena WebDev: from an image1375Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 20 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
AA Intelligence Index24.921.8Grok 4.3
Neither model has a result on the other 1 board here
Agentic workLike-for-likePublic boards, shown as published, kept out of the index33
Agentic work benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
AA Agentic Index15.515.8MiMo-V2.5
Design Arena: agents building web apps1126Not measuredOnly Grok 4.3 measured
Design Arena: agents building full-stack apps1006Not measuredOnly Grok 4.3 measured
Design Arena: agents building mobile apps1059Not measuredOnly Grok 4.3 measured
Design Arena: agents building Android apps967Not measuredOnly Grok 4.3 measured
Design Arena: agents building Godot games914Not measuredOnly Grok 4.3 measured
Design Arena: agents building games1007Not measuredOnly Grok 4.3 measured
Design Arena: HTML slides1008Not measuredOnly Grok 4.3 measured
Design Arena: PowerPoint slides1012Not measuredOnly Grok 4.3 measured
Finance Agent (Vals AI)37.7%36.7%Grok 4.3
Tax Agent Bench (Vals AI)6.2%7.8%MiMo-V2.5
Legal Research Bench (Vals AI)15.4%9.1%Grok 4.3
Excel Modeling Benchmark (Vals AI)18.4%55.1%MiMo-V2.5
τ²-Bench Telecom97.7%90.6%Grok 4.3
Vending-Bench 2$35Not measuredOnly Grok 4.3 measured
LMArena Search1166Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index45
Reasoning benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
GPQA Diamond91.4%81.6%Grok 4.3
MMMU Pro (Vals AI)83.1%80.0%Grok 4.3
GPQA Diamond (Artificial Analysis run)90.1%84.9%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)37.2%27.2%Grok 4.3
GPQA Diamond (Epoch AI run)88.8%Not measuredOnly Grok 4.3 measured
Chess puzzles18.0%Not measuredOnly Grok 4.3 measured
LMArena Text: hard prompts13961450MiMo-V2.5
LMArena Text: expert13841459MiMo-V2.5
LMArena Text: hard prompts in English14021461MiMo-V2.5
LMArena Vision: diagrams12411269MiMo-V2.5
LMArena Vision: homework12411262MiMo-V2.5
Neither model has a result on the other 10 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index03
Math benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
OTIS Mock AIME93.3%Not measuredOnly Grok 4.3 measured
FrontierMath, tiers 1 to 342.8%Not measuredOnly Grok 4.3 measured
FrontierMath, tier 414.6%Not measuredOnly Grok 4.3 measured
ProofBench11.0%16.0%MiMo-V2.5
LMArena Text: math13871436MiMo-V2.5
LMArena Text: mathematical work13961451MiMo-V2.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index46
Knowledge benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
MMLU Pro85.8%82.9%Grok 4.3
LegalBench (Vals AI)84.5%78.9%Grok 4.3
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%59.9%Grok 4.3
TaxEval (Vals AI)70.8%71.8%MiMo-V2.5
MortgageTax (Vals AI)48.3%59.3%MiMo-V2.5
MedCode (Vals AI)38.1%31.9%Grok 4.3
SimpleQA Verified33.2%Not measuredOnly Grok 4.3 measured
LMArena Text: science13991440MiMo-V2.5
LMArena Text: medicine and healthcare13841432MiMo-V2.5
LMArena Text: legal and government13861425MiMo-V2.5
LMArena Text: business and finance13811432MiMo-V2.5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
Design Arena: websites11961266MiMo-V2.5
Design Arena: UI components11921257MiMo-V2.5
Design Arena: game dev11741249MiMo-V2.5
Design Arena: data viz11801249MiMo-V2.5
Design Arena: 3D11251216MiMo-V2.5
Design Arena: all code categories11871260MiMo-V2.5
Design Arena: SVG10811178MiMo-V2.5
Design Arena: ASCII art11251141MiMo-V2.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index722
General benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-V2.5Leader
Public Benefits Bench (Vals AI)51.7%Not measuredOnly Grok 4.3 measured
SAGE (Vals AI)19.7%43.3%MiMo-V2.5
MedScribe (Vals AI)74.4%72.2%Grok 4.3
Vals Multimodal Index43.3%52.8%MiMo-V2.5
IFBench83.3%67.1%Grok 4.3
Long context reasoning (AA-LCR)75.0%73.0%Grok 4.3
DTBench90.7%Not measuredOnly Grok 4.3 measured
LMCA38.3%Not measuredOnly Grok 4.3 measured
LMArena Text13971428MiMo-V2.5
LMArena Text: instruction following13661435MiMo-V2.5
LMArena Text: creative writing13801393MiMo-V2.5
LMArena Vision12291247MiMo-V2.5
LMArena Text: English14041447MiMo-V2.5
LMArena Text: non-English13851405MiMo-V2.5
LMArena Text: Chinese14221469MiMo-V2.5
LMArena Text: German13951421MiMo-V2.5
LMArena Text: Japanese13791306Grok 4.3
LMArena Text: Korean13541361MiMo-V2.5
LMArena Text: French14111448MiMo-V2.5
LMArena Text: Spanish13991414MiMo-V2.5
LMArena Text: Russian13991396Grok 4.3
LMArena Text: Polish13981413MiMo-V2.5
LMArena Text: multi-turn14061445MiMo-V2.5
LMArena Text: longer queries13931445MiMo-V2.5
LMArena Text: writing and language13851409MiMo-V2.5
LMArena Text: entertainment and media13701399MiMo-V2.5
LMArena Vision: English12351259MiMo-V2.5
LMArena Vision: Chinese12571326MiMo-V2.5
LMArena Vision: reading text12351256MiMo-V2.5
LMArena Vision: humor12221226MiMo-V2.5
LMArena Vision: recognizing things12171189Grok 4.3
LMArena Vision: creative writing12371230Grok 4.3
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Grok 4.3 and MiMo-V2.5
BenchmarkGrok 4.3MiMo-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

Grok 4.3$0.0025Fits in one request
MiMo-V2.5$0.0002Fits in one request

MiMo-V2.5 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
MiMo-V2.5$0.0067Fits in one request

MiMo-V2.5 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
MiMo-V2.5$0.026Fits 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 Grok 4.3 and MiMo-V2.5
SpecificationSpaceXAI Grok 4.3Xiaomi MiMo-V2.5
MakerxAIXiaomi
WeightsNo public weights listedOpen weights
ReleasedApril 30, 2026April 22, 2026
Context window1M1.05M
Input $/Mtok$1.25$0.119
Output $/Mtok$2.50$0.238
Coding index22.534.0
Independent measurements behind it11
Cost per solved task$0.31$0.01
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than MiMo-V2.5 for coding?

Pick MiMo-V2.5 for coding: it scores 34.0 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when what matters is LiveCodeBench (Vals AI) or SWE-bench Verified (Vals AI), where it leads.

Which is cheaper, Grok 4.3 or MiMo-V2.5?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; MiMo-V2.5 costs $0.119 and $0.238. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and MiMo-V2.5 $0.01.

Which has the bigger context window, Grok 4.3 or MiMo-V2.5?

MiMo-V2.5, with 1.05M tokens against 1M.

How many benchmarks is the Grok 4.3 vs MiMo-V2.5 comparison based on?

80 benchmarks have a result for both models as of October 21, 2026. Grok 4.3's coding index rests on 1 independent benchmark and MiMo-V2.5's on 1. Where only one model has a result, the page says so instead of naming a winner.

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