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Grok 4.5 vs Kimi K2.6

Grok 4.5 leads Kimi K2.6 on coding, 58.6 to 52.1 on the Vibe Coding Index, and Kimi K2.6 costs 1.5x less per output token ($4.00 vs $6.00 per million). Updated October 22, 2026; 99 benchmarks have a result for both.

Replace Grok 4.5 Replace Kimi K2.6
Grok 4.5xAI
Coding
58.6
Overall
62.1
Output $/M
$6.00
61
Kimi K2.6Moonshot AI
Coding
52.1
Overall
60.5
Output $/M
$4.00
36
vs boards won of 99 shared, 2 tied

Grok 4.5 or Kimi K2.6: which to pick

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 52.1 for Kimi K2.6.

Pick Kimi K2.6 for output tokens 1.5x cheaper ($4.00 vs $6.00 per million) and a lower cost per solved task ($0.35 against $0.62).

Model AGrok 4.5xAI58.6/1006 independent benchmarks$0.62 per solved taskModel BKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved task
Shared results
99
Grok 4.5 only
24
Kimi K2.6 only
10
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 4.5 58.6 from 6 benchmarks, Kimi K2.6 52.1 from 3 benchmarks.
Widest category
Agentic work, 11.7 points apart on average over 14 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.5 69.0% against Kimi K2.6 37.9%, 31.1 points apart on a 0 to 100 scale.
Output price
Grok 4.5 $6.00 against Kimi K2.6 $4.00 per million output tokens, 1.5x apart.
Context window
Grok 4.5 takes 500K 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 4.5BarsKimi K2.6Ties
Coding1231 tie
Intelligence20
Agentic work113
Reasoning65
Math321 tie
Knowledge65
Web design71
General1417
All shared boards61362 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index123
Coding benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
LiveBench coding94.3%Not measuredOnly Grok 4.5 measured
LMArena WebDev15531509Grok 4.5
AA Coding Index72.461.8Grok 4.5
LiveCodeBench (Vals AI)87.3%86.8%Grok 4.5
SWE-bench Verified (Vals AI)86.6%76.2%Grok 4.5
Terminal-Bench 4 (Vals AI)8.6%Not measuredOnly Grok 4.5 measured
Vibe Code Bench (Vals AI)69.0%37.9%Grok 4.5
Code migration (Vals AI)36.6%27.8%Grok 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)40.6%Not measuredOnly Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)67.8%53.6%Grok 4.5
SkillsBench (Vals AI)66.0%Not measuredOnly Grok 4.5 measured
CyberBench (Vals AI)71.0%Not measuredOnly Grok 4.5 measured
SciCode55.0%51.5%Grok 4.5
Terminal-Bench Hard (Artificial Analysis run)Not measured43.9%Only Kimi K2.6 measured
FrontierCode42.4%Not measuredOnly Grok 4.5 measured
WeirdML46.4%55.9%Kimi K2.6
ALE-Bench1309.31092.7Grok 4.5
LMArena Text: coding14741489Kimi K2.6
LMArena Text: software and IT14711484Kimi K2.6
LMArena WebDev: React15561505Grok 4.5
LMArena WebDev: HTML15671485Grok 4.5
LMArena WebDev: from an image15621521Grok 4.5
SciCode6.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
AA Intelligence Index38.827.0Grok 4.5
Epoch Capabilities Index154.1150.9Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index113
Agentic work benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
AA Agentic Index41.220.5Grok 4.5
Design Arena: agents building web apps12181268Kimi K2.6
Design Arena: agents building full-stack apps12491155Grok 4.5
Design Arena: agents building mobile apps12201156Grok 4.5
Design Arena: agents building Android apps12361161Grok 4.5
Design Arena: agents building Godot games12291120Grok 4.5
Design Arena: agents building games12361141Grok 4.5
Design Arena: HTML slides12051135Grok 4.5
Design Arena: PowerPoint slides12301103Grok 4.5
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
LiveBench research85.9%Not measuredOnly Grok 4.5 measured
LiveBench browser44.0%Not measuredOnly Grok 4.5 measured
LiveBench long agentic27.9%Not measuredOnly Grok 4.5 measured
SREBench (Vals AI)0.8%Not measuredOnly Grok 4.5 measured
Finance Agent (Vals AI)48.4%44.9%Grok 4.5
Tax Agent Bench (Vals AI)24.9%12.4%Grok 4.5
Legal Research Bench (Vals AI)38.0%15.9%Grok 4.5
Excel Modeling Benchmark (Vals AI)52.9%57.9%Kimi K2.6
Time Horizon Index (Vals AI)6.3%Not measuredOnly Grok 4.5 measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.6 measured
APEX-Agents56.2%Not measuredOnly Grok 4.5 measured
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
PostTrainBench23.4%Not measuredOnly Grok 4.5 measured
Vending-Bench 2$3,887$6,205Kimi K2.6
LMArena Search1216Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index65
Reasoning benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
GPQA Diamond92.9%89.1%Grok 4.5
LiveBench reasoning87.2%Not measuredOnly Grok 4.5 measured
MMMU Pro (Vals AI)61.8%86.3%Kimi K2.6
GPQA Diamond (Artificial Analysis run)93.1%91.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)42.7%37.5%Grok 4.5
GPQA Diamond (Epoch AI run)93.4%90.8%Grok 4.5
ARC-AGI87.2%Not measuredOnly Grok 4.5 measured
ARC-AGI-252.6%Not measuredOnly Grok 4.5 measured
SimpleBench70.0%Not measuredOnly Grok 4.5 measured
Chess puzzles35.0%20.0%Grok 4.5
Mystery game puzzlesNot measured18.0%Only Kimi K2.6 measured
EBR-benchNot measured2.4%Only Kimi K2.6 measured
LMArena Text: hard prompts14621470Kimi K2.6
LMArena Text: expert14651491Kimi K2.6
LMArena Text: hard prompts in English14641471Kimi K2.6
LMArena Vision: diagrams13041298Grok 4.5
LMArena Vision: homework12951310Kimi K2.6
Kagi LLM Benchmark83.5%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index32
Math benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
OTIS Mock AIME97.8%96.1%Grok 4.5
FrontierMath, tiers 1 to 357.2%57.2%Tie
FrontierMath, tier 424.4%25.6%Kimi K2.6
ProofBench31.0%16.0%Grok 4.5
LMArena Text: math14601474Kimi K2.6
LMArena Text: mathematical work14821480Grok 4.5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
MMLU Pro89.2%87.6%Grok 4.5
LegalBench (Vals AI)86.0%84.7%Grok 4.5
CaseLaw (Vals AI)Not measured61.2%Only Kimi K2.6 measured
CorpFin (Vals AI)67.4%66.7%Grok 4.5
TaxEval (Vals AI)71.7%74.7%Kimi K2.6
MortgageTax (Vals AI)61.8%65.8%Kimi K2.6
MedCode (Vals AI)43.3%40.1%Grok 4.5
SimpleQA Verified48.3%34.9%Grok 4.5
LMArena Text: science14641468Kimi K2.6
LMArena Text: medicine and healthcare14401457Kimi K2.6
LMArena Text: legal and government14631462Grok 4.5
LMArena Text: business and finance14411445Kimi K2.6
FACTS Benchmark Suite50.2%Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index71
Web design benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
Design Arena: websites12811268Grok 4.5
Design Arena: UI components12801263Grok 4.5
Design Arena: game dev12641250Grok 4.5
Design Arena: data viz12661249Grok 4.5
Design Arena: 3D12571267Kimi K2.6
Design Arena: all code categories12751271Grok 4.5
Design Arena: SVG12151181Grok 4.5
Design Arena: ASCII art12561165Grok 4.5
LiveBench design78.1%Not measuredOnly Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1417
General benchmarks for Grok 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi K2.6Leader
LiveBench data analysis73.0%Not measuredOnly Grok 4.5 measured
Public Benefits Bench (Vals AI)Not measured56.6%Only Kimi K2.6 measured
SAGE (Vals AI)35.0%50.2%Kimi K2.6
MedScribe (Vals AI)86.9%78.2%Grok 4.5
Vals Multimodal Index63.4%56.4%Grok 4.5
IFBenchNot measured76.0%Only Kimi K2.6 measured
Long context reasoning (AA-LCR)79.3%81.0%Kimi K2.6
DTBench96.5%90.9%Grok 4.5
LMCA45.2%37.3%Grok 4.5
Surface Evolver Bench74.4%Not measuredOnly Grok 4.5 measured
Furniture assembly22.5%21.7%Grok 4.5
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text14481455Kimi K2.6
LMArena Text: instruction following14451451Kimi K2.6
LMArena Text: creative writing14421434Grok 4.5
LMArena Vision12871282Grok 4.5
LMArena Text: English14531460Kimi K2.6
LMArena Text: non-English14401446Kimi K2.6
LMArena Text: Chinese14951520Kimi K2.6
LMArena Text: German14481451Kimi K2.6
LMArena Text: Japanese14301443Kimi K2.6
LMArena Text: Korean14061427Kimi K2.6
LMArena Text: French14571471Kimi K2.6
LMArena Text: Spanish14511464Kimi K2.6
LMArena Text: Russian14491446Grok 4.5
LMArena Text: Polish14321438Kimi K2.6
LMArena Text: multi-turn14561453Grok 4.5
LMArena Text: longer queries14621468Kimi K2.6
LMArena Text: writing and language14451439Grok 4.5
LMArena Text: entertainment and media14341428Grok 4.5
LMArena Vision: English12851287Kimi K2.6
LMArena Vision: Chinese13451346Kimi K2.6
LMArena Vision: reading text12931291Grok 4.5
LMArena Vision: humor12761280Kimi K2.6
LMArena Vision: creative writing12931273Grok 4.5
LMArena Document14521451Grok 4.5
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 4.5 and Kimi K2.6
BenchmarkGrok 4.5Kimi 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 4.5$0.0050Fits in one request
Kimi K2.6$0.0029Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

Grok 4.5$0.118Fits in one request
Kimi K2.6$0.059Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

Grok 4.5$0.460Fits 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 4.5 and Kimi K2.6
SpecificationSpaceXAI Grok 4.5MoonshotAI Kimi K2.6
MakerxAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 8, 2026April 20, 2026
Context window500K262K
Input $/Mtok$2.00$0.95
Output $/Mtok$6.00$4.00
Coding index58.652.1
Independent measurements behind it63
Cost per solved task$0.62$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.5 better than Kimi K2.6 for coding?

Pick Grok 4.5 for coding: it scores 58.6 on the Vibe Coding Index against 52.1 for Kimi K2.6. Pick Kimi K2.6 for output tokens 1.5x cheaper ($4.00 vs $6.00 per million) and a lower cost per solved task ($0.35 against $0.62).

Which is cheaper, Grok 4.5 or Kimi K2.6?

Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. Per solved SWE-bench Verified task, Grok 4.5 costs $0.62 and Kimi K2.6 $0.35.

Which has the bigger context window, Grok 4.5 or Kimi K2.6?

Grok 4.5, with 500K tokens against 262K.

How many benchmarks is the Grok 4.5 vs Kimi K2.6 comparison based on?

99 benchmarks have a result for both models as of October 22, 2026. Grok 4.5's coding index rests on 6 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/grok-4-5-vs-kimi-k2-6">LLMBenchmark.ai, Grok 4.5 vs Kimi K2.6</a></p>