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Grok 4.5 vs Kimi K2.5

Updated October 21, 2026. 83 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Grok 4.5 Replace Kimi K2.5
Grok 4.5xAI
Coding
75.5
Overall
38.8
Output $/M
$6.00
69
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
14
vs boards won of 83 shared

Decision reading

Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 58.5 for Kimi K2.5.

Pick Kimi K2.5 when output tokens cost 2.4x less, or when a solved task costs $0.24 against $0.62.

Model AGrok 4.5xAI75.5/1002 independent benchmarks$0.62 per solved taskModel BKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved task
Shared results
83
Grok 4.5 only
37
Kimi K2.5 only
15
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 4.5 75.5 from 2 benchmarks, Kimi K2.5 58.5 from 2 benchmarks.
Widest category
Coding, 18.1 points apart on average over 14 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): Grok 4.5 69.0% against Kimi K2.5 17.5%, 51.5 points apart on a 0 to 100 scale.
Output price
Grok 4.5 $6.00 against Kimi K2.5 $2.50 per million output tokens, 2.4x apart.
Context window
Grok 4.5 takes 500K 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 4.5BarsKimi K2.5Ties
Coding131
Intelligence20
Agentic work90
Reasoning93
Math11
Knowledge64
Web design80
General215
All shared boards6914
CodingLike-for-likeFour of these boards feed the Vibe Coding Index131
Coding benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LiveBench coding94.3%Not measuredOnly Grok 4.5 measured
LMArena WebDev15531437Grok 4.5
AA Coding Index72.446.8Grok 4.5
LiveCodeBench (Vals AI)87.3%83.9%Grok 4.5
SWE-bench Verified (Vals AI)86.6%70.0%Grok 4.5
Terminal-Bench 4 (Vals AI)8.6%Not measuredOnly Grok 4.5 measured
Vibe Code Bench (Vals AI)69.0%17.5%Grok 4.5
Code migration (Vals AI)36.6%7.0%Grok 4.5
ProgramBench (Vals AI)0.0%Not measuredOnly Grok 4.5 measured
IOI (Vals AI)40.6%Not measuredOnly Grok 4.5 measured
Terminal-Bench 2.1 (Vals AI)67.8%42.0%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%Not measuredOnly Grok 4.5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured34.8%Only Kimi K2.5 measured
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
FrontierCode42.4%Not measuredOnly Grok 4.5 measured
WeirdML46.4%45.6%Grok 4.5
ALE-Bench1309.3821.6Grok 4.5
LMArena Text: coding14741483Kimi K2.5
LMArena Text: software and IT14711471Grok 4.5
LMArena WebDev: React15561429Grok 4.5
LMArena WebDev: HTML15671426Grok 4.5
LMArena WebDev: from an image15621439Grok 4.5
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
AA Intelligence Index38.823.5Grok 4.5
Epoch Capabilities Index154.1148.1Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index90
Agentic work benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
AA Agentic Index41.2Not measuredOnly Grok 4.5 measured
Design Arena: agents building web apps12171136Grok 4.5
Design Arena: agents building full-stack apps12491114Grok 4.5
Design Arena: agents building mobile apps12211147Grok 4.5
Design Arena: agents building Android apps12421124Grok 4.5
Design Arena: agents building Godot games12291219Grok 4.5
Design Arena: agents building games1235Not measuredOnly Grok 4.5 measured
Design Arena: HTML slides1204Not measuredOnly Grok 4.5 measured
Design Arena: PowerPoint slides1232Not measuredOnly Grok 4.5 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%35.8%Grok 4.5
Tax Agent Bench (Vals AI)24.9%Not measuredOnly Grok 4.5 measured
Legal Research Bench (Vals AI)38.0%15.9%Grok 4.5
Excel Modeling Benchmark (Vals AI)52.9%28.5%Grok 4.5
Time Horizon Index (Vals AI)6.3%Not measuredOnly Grok 4.5 measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.5 measured
APEX-Agents56.2%Not measuredOnly Grok 4.5 measured
PostTrainBench23.4%Not measuredOnly Grok 4.5 measured
OSWorldNot measured63.3%Only Kimi K2.5 measured
Vending-Bench 2$3,887$1,198Grok 4.5
LMArena Search1216Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index93
Reasoning benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
GPQA Diamond92.9%84.1%Grok 4.5
LiveBench reasoning87.2%Not measuredOnly Grok 4.5 measured
MMMU Pro (Vals AI)61.8%84.3%Kimi K2.5
GPQA Diamond (Artificial Analysis run)93.1%87.9%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)42.7%30.7%Grok 4.5
GPQA Diamond (Epoch AI run)93.4%Not measuredOnly Grok 4.5 measured
ARC-AGI87.2%65.3%Grok 4.5
ARC-AGI-252.6%11.8%Grok 4.5
SimpleBench70.0%46.8%Grok 4.5
Chess puzzles35.0%Not measuredOnly Grok 4.5 measured
LMArena Text: hard prompts14621453Grok 4.5
LMArena Text: expert14651466Kimi K2.5
LMArena Text: hard prompts in English14641460Grok 4.5
LMArena Vision: diagrams13041282Grok 4.5
LMArena Vision: homework12951297Kimi K2.5
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index11
Math benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
AIMENot measured95.6%Only Kimi K2.5 measured
OTIS Mock AIME97.8%Not measuredOnly Grok 4.5 measured
FrontierMath, tiers 1 to 357.2%Not measuredOnly Grok 4.5 measured
FrontierMath, tier 424.4%Not measuredOnly Grok 4.5 measured
ProofBench31.0%Not measuredOnly Grok 4.5 measured
LMArena Text: math14601470Kimi K2.5
LMArena Text: mathematical work14821473Grok 4.5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index64
Knowledge benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
MMLU Pro89.2%85.9%Grok 4.5
LegalBench (Vals AI)86.0%Not measuredOnly Grok 4.5 measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)67.4%68.3%Kimi K2.5
TaxEval (Vals AI)71.7%74.2%Kimi K2.5
MortgageTax (Vals AI)61.8%66.5%Kimi K2.5
MedQA (Vals AI)Not measured94.4%Only Kimi K2.5 measured
MedCode (Vals AI)43.3%39.3%Grok 4.5
SimpleQA Verified48.3%34.3%Grok 4.5
LMArena Text: science14641459Grok 4.5
LMArena Text: medicine and healthcare14401448Kimi K2.5
LMArena Text: legal and government14631441Grok 4.5
LMArena Text: business and finance14411427Grok 4.5
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
Design Arena: websites12811249Grok 4.5
Design Arena: UI components12791236Grok 4.5
Design Arena: game dev12631207Grok 4.5
Design Arena: data viz12671219Grok 4.5
Design Arena: 3D12571205Grok 4.5
Design Arena: all code categories12761236Grok 4.5
Design Arena: SVG12151149Grok 4.5
Design Arena: ASCII art12571165Grok 4.5
LiveBench design78.1%Not measuredOnly Grok 4.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index215
General benchmarks for Grok 4.5 and Kimi K2.5
BenchmarkGrok 4.5Kimi K2.5Leader
LiveBench data analysis73.0%Not measuredOnly Grok 4.5 measured
SAGE (Vals AI)35.0%49.9%Kimi K2.5
MedScribe (Vals AI)86.9%76.4%Grok 4.5
Vals Multimodal Index63.4%Not measuredOnly Grok 4.5 measured
IFBenchNot measured70.2%Only Kimi K2.5 measured
Long context reasoning (AA-LCR)79.3%78.0%Grok 4.5
DTBench96.5%Not measuredOnly Grok 4.5 measured
LMCA45.2%Not measuredOnly Grok 4.5 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
Surface Evolver Bench74.4%Not measuredOnly Grok 4.5 measured
Furniture assembly22.5%Not measuredOnly Grok 4.5 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text14481445Grok 4.5
LMArena Text: instruction following14451431Grok 4.5
LMArena Text: creative writing14421422Grok 4.5
LMArena Vision12871269Grok 4.5
LMArena Text: English14531453Kimi K2.5
LMArena Text: non-English14401433Grok 4.5
LMArena Text: Chinese14951494Grok 4.5
LMArena Text: German14481441Grok 4.5
LMArena Text: Japanese14301423Grok 4.5
LMArena Text: Korean14061412Kimi K2.5
LMArena Text: French14571454Grok 4.5
LMArena Text: Spanish14511450Grok 4.5
LMArena Text: Russian14491435Grok 4.5
LMArena Text: Polish14321445Kimi K2.5
LMArena Text: multi-turn14561444Grok 4.5
LMArena Text: longer queries14621445Grok 4.5
LMArena Text: writing and language14451425Grok 4.5
LMArena Text: entertainment and media14341417Grok 4.5
LMArena Vision: English12851274Grok 4.5
LMArena Vision: Chinese13451328Grok 4.5
LMArena Vision: reading text12931276Grok 4.5
LMArena Vision: humor12761284Kimi K2.5
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing thingsNot measured1285Only Kimi K2.5 measured
LMArena Vision: creative writing12931269Grok 4.5
LMArena Document1452Not measuredOnly Grok 4.5 measured
Neither model has a result on the other 7 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 K2.5
BenchmarkGrok 4.5Kimi 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 4.5$0.0050Fits in one request
Kimi K2.5$0.0018Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Grok 4.5$0.118Fits in one request
Kimi K2.5$0.033Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Grok 4.5$0.460Fits 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 4.5 and Kimi K2.5
SpecificationSpaceXAI Grok 4.5MoonshotAI Kimi K2.5
MakerxAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJuly 8, 2026January 27, 2026
Context window500K262K
Input $/Mtok$2.00$0.50
Output $/Mtok$6.00$2.50
Coding index75.558.5
Independent measurements behind it22
Cost per solved task$0.62$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Grok 4.5 better than Kimi K2.5 for coding?

Pick Grok 4.5 for coding: it scores 75.5 on the Vibe Coding Index against 58.5 for Kimi K2.5. Pick Kimi K2.5 when output tokens cost 2.4x less, or when a solved task costs $0.24 against $0.62.

Which is cheaper, Grok 4.5 or Kimi K2.5?

Grok 4.5 costs $2.00 per million input tokens and $6.00 per million output tokens; Kimi K2.5 costs $0.50 and $2.50. Per solved SWE-bench Verified task, Grok 4.5 costs $0.62 and Kimi K2.5 $0.24.

Which has the bigger context window, Grok 4.5 or Kimi K2.5?

Grok 4.5, with 500K tokens against 262K.

How many benchmarks is the Grok 4.5 vs Kimi K2.5 comparison based on?

83 benchmarks have a result for both models as of October 21, 2026. Grok 4.5's coding index rests on 2 independent benchmarks 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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