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Grok 4.3 vs Kimi K2.5

Updated October 21, 2026. 84 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 Kimi K2.5
Grok 4.3xAI
Coding
22.5
Overall
24.9
Output $/M
$2.50
15
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
68
vs boards won of 84 shared, 1 tied

Decision reading

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 22.5 for Grok 4.3.

Pick Grok 4.3 when the context window is larger, 1M against 262K tokens, or 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 BKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved task
Shared results
84
Grok 4.3 only
20
Kimi K2.5 only
14
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, Kimi K2.5 58.5 from 2 benchmarks.
Widest category
Math, 13.4 points apart on average over 2 shared benchmarks.
Widest single gap
Design Arena: agents building Godot games: Grok 4.3 914 against Kimi K2.5 1219, 38.1 points apart on a 0 to 100 scale.
Output price
Both cost $2.50 per million output tokens.
Context window
Grok 4.3 takes 1M tokens, Kimi K2.5 262K.

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 4.3BarsKimi K2.5Ties
Coding681 tie
Intelligence10
Agentic work28
Reasoning36
Math02
Knowledge29
Web design08
General127
All shared boards15681 tie
CodingLike-for-likeFour of these boards feed the Vibe Coding Index68
Coding benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LMArena WebDev13581437Kimi K2.5
AA Coding Index42.246.8Kimi K2.5
LiveCodeBench (Vals AI)84.5%83.9%Grok 4.3
SWE-bench Verified (Vals AI)71.4%70.0%Grok 4.3
Vibe Code Bench (Vals AI)19.4%17.5%Grok 4.3
Code migration (Vals AI)6.8%7.0%Kimi K2.5
ProgramBench (Vals AI)0.0%Not measuredOnly Grok 4.3 measured
Terminal-Bench 2.1 (Vals AI)42.0%42.0%Tie
SkillsBench (Vals AI)40.6%Not measuredOnly Grok 4.3 measured
SciCode48.3%Not measuredOnly Grok 4.3 measured
Terminal-Bench Hard (Artificial Analysis run)37.9%34.8%Grok 4.3
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
WeirdML49.9%45.6%Grok 4.3
ALE-Bench944.2821.6Grok 4.3
LMArena Text: coding14151483Kimi K2.5
LMArena Text: software and IT14161471Kimi K2.5
LMArena WebDev: React13531429Kimi K2.5
LMArena WebDev: HTML13671426Kimi K2.5
LMArena WebDev: from an image13751439Kimi K2.5
Neither model has a result on the other 17 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
AA Intelligence Index24.923.5Grok 4.3
Epoch Capabilities IndexNot measured148.1Only Kimi K2.5 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index28
Agentic work benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
AA Agentic Index15.5Not measuredOnly Grok 4.3 measured
Design Arena: agents building web apps11261136Kimi K2.5
Design Arena: agents building full-stack apps10061114Kimi K2.5
Design Arena: agents building mobile apps10591147Kimi K2.5
Design Arena: agents building Android apps9671124Kimi K2.5
Design Arena: agents building Godot games9141219Kimi K2.5
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%35.8%Grok 4.3
Tax Agent Bench (Vals AI)6.2%Not measuredOnly Grok 4.3 measured
Legal Research Bench (Vals AI)15.4%15.9%Kimi K2.5
Excel Modeling Benchmark (Vals AI)18.4%28.5%Kimi K2.5
τ²-Bench Telecom97.7%95.9%Grok 4.3
OSWorldNot measured63.3%Only Kimi K2.5 measured
Vending-Bench 2$35$1,198Kimi K2.5
LMArena Search1166Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 22 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index36
Reasoning benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
GPQA Diamond91.4%84.1%Grok 4.3
MMMU Pro (Vals AI)83.1%84.3%Kimi K2.5
GPQA Diamond (Artificial Analysis run)90.1%87.9%Grok 4.3
Humanity's Last Exam (Artificial Analysis run)37.2%30.7%Grok 4.3
GPQA Diamond (Epoch AI run)88.8%Not measuredOnly Grok 4.3 measured
ARC-AGINot measured65.3%Only Kimi K2.5 measured
ARC-AGI-2Not measured11.8%Only Kimi K2.5 measured
SimpleBenchNot measured46.8%Only Kimi K2.5 measured
Chess puzzles18.0%Not measuredOnly Grok 4.3 measured
LMArena Text: hard prompts13961453Kimi K2.5
LMArena Text: expert13841466Kimi K2.5
LMArena Text: hard prompts in English14021460Kimi K2.5
LMArena Vision: diagrams12411282Kimi K2.5
LMArena Vision: homework12411297Kimi K2.5
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index02
Math benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
AIMENot measured95.6%Only Kimi K2.5 measured
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%Not measuredOnly Grok 4.3 measured
LMArena Text: math13871470Kimi K2.5
LMArena Text: mathematical work13961473Kimi K2.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index29
Knowledge benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
MMLU Pro85.8%85.9%Kimi K2.5
LegalBench (Vals AI)84.5%Not measuredOnly Grok 4.3 measured
CaseLaw (Vals AI)79.3%58.7%Grok 4.3
CorpFin (Vals AI)68.5%68.3%Grok 4.3
TaxEval (Vals AI)70.8%74.2%Kimi K2.5
MortgageTax (Vals AI)48.3%66.5%Kimi K2.5
MedQA (Vals AI)Not measured94.4%Only Kimi K2.5 measured
MedCode (Vals AI)38.1%39.3%Kimi K2.5
SimpleQA Verified33.2%34.3%Kimi K2.5
LMArena Text: science13991459Kimi K2.5
LMArena Text: medicine and healthcare13841448Kimi K2.5
LMArena Text: legal and government13861441Kimi K2.5
LMArena Text: business and finance13811427Kimi K2.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
Design Arena: websites11961249Kimi K2.5
Design Arena: UI components11921236Kimi K2.5
Design Arena: game dev11741207Kimi K2.5
Design Arena: data viz11801219Kimi K2.5
Design Arena: 3D11251205Kimi K2.5
Design Arena: all code categories11871236Kimi K2.5
Design Arena: SVG10811149Kimi K2.5
Design Arena: ASCII art11251165Kimi K2.5
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index127
General benchmarks for Grok 4.3 and Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
Public Benefits Bench (Vals AI)51.7%Not measuredOnly Grok 4.3 measured
SAGE (Vals AI)19.7%49.9%Kimi K2.5
MedScribe (Vals AI)74.4%76.4%Kimi K2.5
Vals Multimodal Index43.3%Not measuredOnly Grok 4.3 measured
IFBench83.3%70.2%Grok 4.3
Long context reasoning (AA-LCR)75.0%78.0%Kimi K2.5
DTBench90.7%Not measuredOnly Grok 4.3 measured
LMCA38.3%Not measuredOnly Grok 4.3 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text13971445Kimi K2.5
LMArena Text: instruction following13661431Kimi K2.5
LMArena Text: creative writing13801422Kimi K2.5
LMArena Vision12291269Kimi K2.5
LMArena Text: English14041453Kimi K2.5
LMArena Text: non-English13851433Kimi K2.5
LMArena Text: Chinese14221494Kimi K2.5
LMArena Text: German13951441Kimi K2.5
LMArena Text: Japanese13791423Kimi K2.5
LMArena Text: Korean13541412Kimi K2.5
LMArena Text: French14111454Kimi K2.5
LMArena Text: Spanish13991450Kimi K2.5
LMArena Text: Russian13991435Kimi K2.5
LMArena Text: Polish13981445Kimi K2.5
LMArena Text: multi-turn14061444Kimi K2.5
LMArena Text: longer queries13931445Kimi K2.5
LMArena Text: writing and language13851425Kimi K2.5
LMArena Text: entertainment and media13701417Kimi K2.5
LMArena Vision: English12351274Kimi K2.5
LMArena Vision: Chinese12571328Kimi K2.5
LMArena Vision: reading text12351276Kimi K2.5
LMArena Vision: humor12221284Kimi K2.5
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing things12171285Kimi K2.5
LMArena Vision: creative writing12371269Kimi K2.5
Neither model has a result on the other 10 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 Kimi K2.5
BenchmarkGrok 4.3Kimi K2.5Leader
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
Kimi K2.5$0.0018Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
Kimi K2.5$0.033Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
Kimi K2.5$0.125Fits in one request

Kimi K2.5 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 Kimi K2.5
SpecificationSpaceXAI Grok 4.3MoonshotAI Kimi K2.5
MakerxAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedApril 30, 2026January 27, 2026
Context window1M262K
Input $/Mtok$1.25$0.50
Output $/Mtok$2.50$2.50
Coding index22.558.5
Independent measurements behind it12
Cost per solved task$0.31$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Kimi K2.5 for coding?

Pick Kimi K2.5 for coding: it scores 58.5 on the Vibe Coding Index against 22.5 for Grok 4.3. Pick Grok 4.3 when the context window is larger, 1M against 262K tokens, or when what matters is LiveCodeBench (Vals AI) or SWE-bench Verified (Vals AI), where it leads.

Which is cheaper, Grok 4.3 or Kimi K2.5?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Kimi K2.5 costs $0.50 and $2.50. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Kimi K2.5 $0.24.

Which has the bigger context window, Grok 4.3 or Kimi K2.5?

Grok 4.3, with 1M tokens against 262K.

How many benchmarks is the Grok 4.3 vs Kimi K2.5 comparison based on?

84 benchmarks have a result for both models as of October 21, 2026. Grok 4.3's coding index rests on 1 independent benchmark and Kimi K2.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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