Enter opens the highlighted result. Esc closes.

Grok 4.3 vs Kimi K3

Kimi K3 leads Grok 4.3 on coding, 62.3 to 37.4 on the Vibe Coding Index, and Grok 4.3 costs 6.0x less per output token ($2.50 vs $15.00 per million). Updated October 22, 2026; 89 benchmarks have a result for both.

Replace Grok 4.3 Replace Kimi K3
Grok 4.3xAI
Coding
37.4
Overall
53.1
Output $/M
$2.50
0
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
89
vs boards won of 89 shared

Grok 4.3 or Kimi K3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 37.4 for Grok 4.3.

Pick Grok 4.3 for output tokens 6.0x cheaper ($2.50 vs $15.00 per million) and a lower cost per solved task ($0.31 against $0.81).

Model AGrok 4.3xAI37.4/1003 independent benchmarks$0.31 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
89
Grok 4.3 only
16
Kimi K3 only
28
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 K3 62.3 from 6 benchmarks.
Widest category
Agentic work, 31.1 points apart on average over 15 shared benchmarks.
Widest single gap
ProofBench: Grok 4.3 11.0% against Kimi K3 87.0%, 76.0 points apart on a 0 to 100 scale.
Output price
Grok 4.3 $2.50 against Kimi K3 $15.00 per million output tokens, 6.0x apart.
Context window
Grok 4.3 takes 1M tokens, Kimi K3 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 4.3BarsKimi K3Ties
Coding016
Intelligence01
Agentic work015
Reasoning09
Math06
Knowledge011
Web design07
General024
All shared boards089
CodingLike-for-likeSix of these boards feed the Vibe Coding Index016
Coding benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDev13581655Kimi K3
AA Coding Index42.276.2Kimi K3
LiveCodeBench (Vals AI)84.5%87.2%Kimi K3
SWE-bench Verified (Vals AI)71.4%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)Not measured17.2%Only Kimi K3 measured
Vibe Code Bench (Vals AI)19.4%85.0%Kimi K3
Code migration (Vals AI)6.8%16.1%Kimi K3
ProgramBench (Vals AI)0.0%2.0%Kimi K3
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)42.0%80.9%Kimi K3
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
SkillsBench (Vals AI)40.6%Not measuredOnly Grok 4.3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCode48.3%59.5%Kimi K3
Terminal-Bench Hard (Artificial Analysis run)37.9%Not measuredOnly Grok 4.3 measured
FrontierCodeNot measured44.2%Only Kimi K3 measured
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML49.9%82.6%Kimi K3
ALE-Bench944.21524.5Kimi K3
LMArena Text: coding14151508Kimi K3
LMArena Text: software and IT14161499Kimi K3
LMArena WebDev: React13531670Kimi K3
LMArena WebDev: HTML13671644Kimi K3
LMArena WebDev: from an image13751579Kimi K3
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index01
Intelligence benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
AA Intelligence Index24.943.6Kimi K3
Epoch Capabilities IndexNot measured157.9Only Kimi K3 measured
Agentic workLike-for-likePublic boards, shown as published, kept out of the index015
Agentic work benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
AA Agentic Index15.550.0Kimi K3
Design Arena: agents building web apps11261295Kimi K3
Design Arena: agents building full-stack apps10061315Kimi K3
Design Arena: agents building mobile apps10581269Kimi K3
Design Arena: agents building Android apps9621253Kimi K3
Design Arena: agents building Godot games9141223Kimi K3
Design Arena: agents building games10071252Kimi K3
Design Arena: HTML slides9591206Kimi K3
Design Arena: PowerPoint slides9881247Kimi K3
Design Arena: spreadsheets8791070Kimi K3
LiveBench researchNot measured79.0%Only Kimi K3 measured
LiveBench browserNot measured16.0%Only Kimi K3 measured
LiveBench long agenticNot measured42.8%Only Kimi K3 measured
Finance Agent (Vals AI)37.7%53.1%Kimi K3
Tax Agent Bench (Vals AI)6.2%33.4%Kimi K3
Legal Research Bench (Vals AI)15.4%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)18.4%66.7%Kimi K3
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)Not measured1.4%Only Kimi K3 measured
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom97.7%Not measuredOnly Grok 4.3 measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2$35$5,165Kimi K3
LMArena Search1166Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index09
Reasoning benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
GPQA Diamond91.4%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)83.1%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)90.1%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)37.2%46.9%Kimi K3
GPQA Diamond (Epoch AI run)88.8%93.1%Kimi K3
ARC-AGINot measured94.5%Only Kimi K3 measured
ARC-AGI-2Not measured60.4%Only Kimi K3 measured
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles18.0%37.0%Kimi K3
Mystery game puzzlesNot measured26.0%Only Kimi K3 measured
LMArena Text: hard prompts13961495Kimi K3
LMArena Text: expert13841520Kimi K3
LMArena Text: hard prompts in English14021496Kimi K3
LMArena Vision: diagrams1241Not measuredOnly Grok 4.3 measured
LMArena Vision: homework1241Not measuredOnly Grok 4.3 measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
OTIS Mock AIME93.3%97.2%Kimi K3
FrontierMath, tiers 1 to 342.8%72.2%Kimi K3
FrontierMath, tier 414.6%39.0%Kimi K3
ProofBench11.0%87.0%Kimi K3
LMArena Text: math13871494Kimi K3
LMArena Text: mathematical work13961505Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index011
Knowledge benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
MMLU Pro85.8%88.0%Kimi K3
LegalBench (Vals AI)84.5%86.2%Kimi K3
CaseLaw (Vals AI)79.3%Not measuredOnly Grok 4.3 measured
CorpFin (Vals AI)68.5%71.6%Kimi K3
TaxEval (Vals AI)70.8%75.7%Kimi K3
MortgageTax (Vals AI)48.3%66.3%Kimi K3
MedCode (Vals AI)38.1%49.4%Kimi K3
SimpleQA Verified33.2%50.6%Kimi K3
LMArena Text: science13991508Kimi K3
LMArena Text: medicine and healthcare13841489Kimi K3
LMArena Text: legal and government13861503Kimi K3
LMArena Text: business and finance13811470Kimi K3
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
Design Arena: websites11961334Kimi K3
Design Arena: UI components11901341Kimi K3
Design Arena: game dev11731358Kimi K3
Design Arena: data viz11791351Kimi K3
Design Arena: 3D11241387Kimi K3
Design Arena: all code categories11861360Kimi K3
Design Arena: SVG10801302Kimi K3
Design Arena: ASCII art1125Not measuredOnly Grok 4.3 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index024
General benchmarks for Grok 4.3 and Kimi K3
BenchmarkGrok 4.3Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)51.7%68.2%Kimi K3
SAGE (Vals AI)19.7%52.8%Kimi K3
MedScribe (Vals AI)74.4%88.0%Kimi K3
Vals Multimodal Index43.3%73.4%Kimi K3
IFBench83.3%Not measuredOnly Grok 4.3 measured
Long context reasoning (AA-LCR)75.0%88.7%Kimi K3
DTBench90.7%91.2%Kimi K3
LMCA38.3%52.7%Kimi K3
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text13971476Kimi K3
LMArena Text: instruction following13661485Kimi K3
LMArena Text: creative writing13801457Kimi K3
LMArena Vision1229Not measuredOnly Grok 4.3 measured
LMArena Text: English14041481Kimi K3
LMArena Text: non-English13851466Kimi K3
LMArena Text: Chinese14221529Kimi K3
LMArena Text: German13951490Kimi K3
LMArena Text: Japanese13791494Kimi K3
LMArena Text: Korean13541460Kimi K3
LMArena Text: French14111492Kimi K3
LMArena Text: Spanish13991472Kimi K3
LMArena Text: Russian13991485Kimi K3
LMArena Text: Polish13981458Kimi K3
LMArena Text: multi-turn14061489Kimi K3
LMArena Text: longer queries13931494Kimi K3
LMArena Text: writing and language13851471Kimi K3
LMArena Text: entertainment and media13701453Kimi K3
LMArena Vision: English1235Not measuredOnly Grok 4.3 measured
LMArena Vision: Chinese1257Not measuredOnly Grok 4.3 measured
LMArena Vision: reading text1235Not measuredOnly Grok 4.3 measured
LMArena Vision: humor1222Not measuredOnly Grok 4.3 measured
LMArena Vision: recognizing things1217Not measuredOnly Grok 4.3 measured
LMArena Vision: creative writing1237Not measuredOnly Grok 4.3 measured
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 K3
BenchmarkGrok 4.3Kimi K3Leader
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 K3$0.011Fits in one request

Grok 4.3 costs less

Repository review

50K input + 3K output tokens

Grok 4.3$0.070Fits in one request
Kimi K3$0.195Fits in one request

Grok 4.3 costs less

Agent loop

200K input + 10K output tokens

Grok 4.3$0.275Fits in one request
Kimi K3$0.750Fits in one request

Grok 4.3 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 K3
SpecificationSpaceXAI Grok 4.3MoonshotAI Kimi K3
MakerxAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedApril 30, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$1.25$3.00
Output $/Mtok$2.50$15.00
Coding index37.462.3
Independent measurements behind it36
Cost per solved task$0.31$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.3 better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 37.4 for Grok 4.3. Pick Grok 4.3 for output tokens 6.0x cheaper ($2.50 vs $15.00 per million) and a lower cost per solved task ($0.31 against $0.81).

Which is cheaper, Grok 4.3 or Kimi K3?

Grok 4.3 costs $1.25 per million input tokens and $2.50 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Grok 4.3 costs $0.31 and Kimi K3 $0.81.

Which has the bigger context window, Grok 4.3 or Kimi K3?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Grok 4.3 vs Kimi K3 comparison based on?

89 benchmarks have a result for both models as of October 22, 2026. Grok 4.3's coding index rests on 3 independent benchmarks and Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/grok-4-3-vs-kimi-k3" title="Grok 4.3 vs Kimi K3, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/grok-4-3-vs-kimi-k3">LLMBenchmark.ai, Grok 4.3 vs Kimi K3</a></p>