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Grok 4.3 vs Kimi K2.6

Kimi K2.6 leads Grok 4.3 on coding, 52.1 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 1.6x less per output token ($2.50 vs $4.00 per million). Updated October 21, 2026; 101 benchmarks have a result for both.

Replace Grok 4.3 Replace Kimi K2.6
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
6
Kimi K2.6Moonshot AI
Coding
52.1
Overall
60.5
Output $/M
$4.00
94
vs boards won of 101 shared, 1 tied

Grok 4.3 or Kimi K2.6: which to pick

Pick Kimi K2.6 for coding: it scores 52.1 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 1.6x cheaper ($2.50 vs $4.00 per million) and a lower cost per solved task ($0.31 against $0.35).

Model AGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved taskModel BKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved task
Shared results
101
Grok 4.3 only
3
Kimi K2.6 only
8
Like-for-like categories
8 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
Grok 4.3 37.4 from 3 benchmarks, Kimi K2.6 52.1 from 3 benchmarks.
Widest category
Agentic work, 16.7 points apart on average over 15 shared benchmarks.
Widest single gap
Excel Modeling Benchmark (Vals AI): Grok 4.3 18.4% against Kimi K2.6 57.9%, 39.5 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Kimi K2.6 $4.00 per million output tokens, 1.6x apart.
Context window
Grok 4.3 takes 1M tokens, Kimi K2.6 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 K2.6Ties
Coding0161 tie
Intelligence01
Agentic work114
Reasoning110
Math06
Knowledge210
Web design08
General229
All shared boards6941 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index016
Coding benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
LMArena WebDev13581509Kimi K2.6
AA Coding Index42.261.8Kimi K2.6
LiveCodeBench (Vals AI)84.5%86.8%Kimi K2.6
SWE-bench Verified (Vals AI)71.4%76.2%Kimi K2.6
Vibe Code Bench (Vals AI)19.4%37.9%Kimi K2.6
Code migration (Vals AI)6.8%27.8%Kimi K2.6
ProgramBench (Vals AI)0.0%0.0%Tie
Terminal-Bench 2.1 (Vals AI)42.0%53.6%Kimi K2.6
SkillsBench (Vals AI)40.6%Not measuredOnly Grok 4.3 measured
SciCode48.3%51.5%Kimi K2.6
Terminal-Bench Hard (Artificial Analysis run)37.9%43.9%Kimi K2.6
WeirdML49.9%55.9%Kimi K2.6
ALE-Bench944.21092.7Kimi K2.6
LMArena Text: coding14151489Kimi K2.6
LMArena Text: software and IT14161484Kimi K2.6
LMArena WebDev: React13531505Kimi K2.6
LMArena WebDev: HTML13671485Kimi K2.6
LMArena WebDev: from an image13751521Kimi K2.6
Neither model has a result on the other 21 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
AA Intelligence Index24.927.0Kimi K2.6
Epoch Capabilities IndexNot measured150.9Only Kimi K2.6 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index114
Agentic work benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
AA Agentic Index15.520.5Kimi K2.6
Design Arena: agents building web apps11261268Kimi K2.6
Design Arena: agents building full-stack apps10061155Kimi K2.6
Design Arena: agents building mobile apps10591157Kimi K2.6
Design Arena: agents building Android apps9611160Kimi K2.6
Design Arena: agents building Godot games9141120Kimi K2.6
Design Arena: agents building games10071141Kimi K2.6
Design Arena: HTML slides10081184Kimi K2.6
Design Arena: PowerPoint slides10131128Kimi K2.6
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
Finance Agent (Vals AI)37.7%44.9%Kimi K2.6
Tax Agent Bench (Vals AI)6.2%12.4%Kimi K2.6
Legal Research Bench (Vals AI)15.4%15.9%Kimi K2.6
Excel Modeling Benchmark (Vals AI)18.4%57.9%Kimi K2.6
τ²-Bench Telecom97.7%95.9%Grok 4.3
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
Vending-Bench 2$35$6,205Kimi K2.6
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 index110
Reasoning benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
GPQA Diamond91.4%89.1%Grok 4.3
MMMU Pro (Vals AI)83.1%86.3%Kimi K2.6
GPQA Diamond (Artificial Analysis run)90.1%91.1%Kimi K2.6
Humanity's Last Exam (Artificial Analysis run)37.2%37.5%Kimi K2.6
GPQA Diamond (Epoch AI run)88.8%90.8%Kimi K2.6
Chess puzzles18.0%20.0%Kimi K2.6
Mystery game puzzlesNot measured18.0%Only Kimi K2.6 measured
EBR-benchNot measured2.4%Only Kimi K2.6 measured
LMArena Text: hard prompts13961470Kimi K2.6
LMArena Text: expert13841491Kimi K2.6
LMArena Text: hard prompts in English14021471Kimi K2.6
LMArena Vision: diagrams12411298Kimi K2.6
LMArena Vision: homework12411310Kimi K2.6
Neither model has a result on the other 9 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
OTIS Mock AIME93.3%96.1%Kimi K2.6
FrontierMath, tiers 1 to 342.8%57.2%Kimi K2.6
FrontierMath, tier 414.6%25.6%Kimi K2.6
ProofBench11.0%16.0%Kimi K2.6
LMArena Text: math13871474Kimi K2.6
LMArena Text: mathematical work13961480Kimi K2.6
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index210
Knowledge benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
MMLU Pro85.8%87.6%Kimi K2.6
LegalBench (Vals AI)84.5%84.7%Kimi K2.6
CaseLaw (Vals AI)79.3%61.2%Grok 4.3
CorpFin (Vals AI)68.5%66.7%Grok 4.3
TaxEval (Vals AI)70.8%74.7%Kimi K2.6
MortgageTax (Vals AI)48.3%65.8%Kimi K2.6
MedCode (Vals AI)38.1%40.1%Kimi K2.6
SimpleQA Verified33.2%34.9%Kimi K2.6
LMArena Text: science13991468Kimi K2.6
LMArena Text: medicine and healthcare13841457Kimi K2.6
LMArena Text: legal and government13861462Kimi K2.6
LMArena Text: business and finance13811445Kimi K2.6
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index08
Web design benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
Design Arena: websites11961269Kimi K2.6
Design Arena: UI components11921266Kimi K2.6
Design Arena: game dev11741251Kimi K2.6
Design Arena: data viz11791249Kimi K2.6
Design Arena: 3D11251268Kimi K2.6
Design Arena: all code categories11871272Kimi K2.6
Design Arena: SVG10811181Kimi K2.6
Design Arena: ASCII art11251165Kimi K2.6
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index229
General benchmarks for Grok 4.3 and Kimi K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
Public Benefits Bench (Vals AI)51.7%56.6%Kimi K2.6
SAGE (Vals AI)19.7%50.2%Kimi K2.6
MedScribe (Vals AI)74.4%78.2%Kimi K2.6
Vals Multimodal Index43.3%56.4%Kimi K2.6
IFBench83.3%76.0%Grok 4.3
Long context reasoning (AA-LCR)75.0%81.0%Kimi K2.6
DTBench90.7%90.9%Kimi K2.6
LMCA38.3%37.3%Grok 4.3
Furniture assemblyNot measured21.7%Only Kimi K2.6 measured
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text13971455Kimi K2.6
LMArena Text: instruction following13661451Kimi K2.6
LMArena Text: creative writing13801434Kimi K2.6
LMArena Vision12291282Kimi K2.6
LMArena Text: English14041460Kimi K2.6
LMArena Text: non-English13851446Kimi K2.6
LMArena Text: Chinese14221520Kimi K2.6
LMArena Text: German13951451Kimi K2.6
LMArena Text: Japanese13791443Kimi K2.6
LMArena Text: Korean13541427Kimi K2.6
LMArena Text: French14111471Kimi K2.6
LMArena Text: Spanish13991464Kimi K2.6
LMArena Text: Russian13991446Kimi K2.6
LMArena Text: Polish13981438Kimi K2.6
LMArena Text: multi-turn14061453Kimi K2.6
LMArena Text: longer queries13931468Kimi K2.6
LMArena Text: writing and language13851439Kimi K2.6
LMArena Text: entertainment and media13701428Kimi K2.6
LMArena Vision: English12351287Kimi K2.6
LMArena Vision: Chinese12571346Kimi K2.6
LMArena Vision: reading text12351291Kimi K2.6
LMArena Vision: humor12221280Kimi K2.6
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing12371273Kimi K2.6
LMArena DocumentNot measured1451Only Kimi K2.6 measured
Neither model has a result on the other 11 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 K2.6
BenchmarkGrok 4.3Kimi K2.6Leader
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 K2.6$0.0029Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
Kimi K2.6$0.059Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
Kimi K2.6$0.230Fits in one request

Kimi K2.6 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 K2.6
SpecificationSpaceXAI Grok 4.3MoonshotAI Kimi K2.6
MakerxAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedApril 30, 2026April 20, 2026
Context window1M262K
Input $/Mtok$1.25$0.95
Output $/Mtok$2.50$4.00
Coding index37.452.1
Independent measurements behind it33
Cost per solved task$0.31$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Kimi K2.6 for coding?

Pick Kimi K2.6 for coding: it scores 52.1 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 1.6x cheaper ($2.50 vs $4.00 per million) and a lower cost per solved task ($0.31 against $0.35).

Which is cheaper, Grok 4.3 or Kimi K2.6?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Kimi K2.6 $0.35.

Which has the bigger context window, Grok 4.3 or Kimi K2.6?

Grok 4.3, with 1M tokens against 262K.

How many benchmarks is the Grok 4.3 vs Kimi K2.6 comparison based on?

101 benchmarks have a result for both models as of October 21, 2026. Grok 4.3's coding index rests on 3 independent benchmarks and Kimi K2.6's on 3. Where only one model has a result, the page says so instead of naming a winner.

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