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Kimi K3 vs Qwen3.8 27B

Updated October 21, 2026. 76 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Kimi K3 Replace Qwen3.8 27B
Kimi K3Moonshot AI
Coding
61.8
Overall
43.6
Output $/M
$11.936
74
Qwen3.8 27BQwen
Coding
73.6
Overall
33.7
Output $/M
$1.35
2
vs boards won of 76 shared

Decision reading

Pick Qwen3.8 27B for coding: it scores 73.6 on the Vibe Coding Index against 61.8 for Kimi K3.

Pick Kimi K3 when a solved task costs $0.81 against $1.26, or when the context window is larger, 1.05M against 1M tokens.

Model AKimi K3Moonshot AI61.8/1002 independent benchmarks$0.81 per solved taskModel BQwen3.8 27BQwen73.6/1002 independent benchmarks$1.26 per solved task
Shared results
76
Kimi K3 only
41
Qwen3.8 27B only
9
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
Kimi K3 61.8 from 2 benchmarks, Qwen3.8 27B 73.6 from 2 benchmarks.
Widest category
Math, 28.5 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: Kimi K3 87.0% against Qwen3.8 27B 16.0%, 71.0 points apart on a 0 to 100 scale.
Output price
Kimi K3 $11.936 against Qwen3.8 27B $1.35 per million output tokens, 8.8x apart.
Context window
Kimi K3 takes 1.05M tokens, Qwen3.8 27B 1M.

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
CategoryKimi K3BarsQwen3.8 27BTies
Coding161
Intelligence20
Agentic work91
Reasoning100
Math30
Knowledge90
Web design10
General240
All shared boards742
CodingLike-for-likeFour of these boards feed the Vibe Coding Index161
Coding benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
LiveBench coding59.3%86.8%Qwen3.8 27B
LMArena WebDev16551593Kimi K3
AA Coding Index76.268.1Kimi K3
LiveCodeBench (Vals AI)87.2%84.0%Kimi K3
SWE-bench Verified (Vals AI)93.4%86.0%Kimi K3
Terminal-Bench 4 (Vals AI)17.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench (Vals AI)85.0%64.8%Kimi K3
Code migration (Vals AI)16.1%14.2%Kimi K3
ProgramBench (Vals AI)2.0%0.0%Kimi K3
IOI (Vals AI)48.9%39.1%Kimi K3
Terminal-Bench 2.1 (Vals AI)80.9%58.4%Kimi K3
SWE-bench Multimodal (Vals AI)44.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)18.2%Not measuredOnly Kimi K3 measured
SkillsBench (Vals AI)Not measured38.1%Only Qwen3.8 27B measured
CyberBench (Vals AI)75.2%67.8%Kimi K3
SciCode59.5%46.6%Kimi K3
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
WeirdML82.6%Not measuredOnly Kimi K3 measured
ALE-Bench1524.5Not measuredOnly Kimi K3 measured
LMArena Text: coding15081483Kimi K3
LMArena Text: software and IT14991478Kimi K3
LMArena WebDev: React16701602Kimi K3
LMArena WebDev: HTML16441570Kimi K3
LMArena WebDev: from an image15791577Kimi K3
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
AA Intelligence Index43.633.7Kimi K3
Epoch Capabilities Index157.9151.7Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index91
Agentic work benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
AA Agentic Index50.045.8Kimi K3
Design Arena: agents building web apps1296Not measuredOnly Kimi K3 measured
Design Arena: agents building full-stack apps1315Not measuredOnly Kimi K3 measured
Design Arena: agents building mobile apps1267Not measuredOnly Kimi K3 measured
Design Arena: agents building Android apps1256Not measuredOnly Kimi K3 measured
Design Arena: agents building Godot games1223Not measuredOnly Kimi K3 measured
Design Arena: agents building games1252Not measuredOnly Kimi K3 measured
Design Arena: HTML slides1256Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides1273Not measuredOnly Kimi K3 measured
Design Arena: spreadsheets1058Not measuredOnly Kimi K3 measured
LiveBench research79.0%59.4%Kimi K3
LiveBench browser16.0%32.0%Qwen3.8 27B
LiveBench long agentic42.8%27.9%Kimi K3
Finance Agent (Vals AI)53.1%48.5%Kimi K3
Tax Agent Bench (Vals AI)33.4%30.9%Kimi K3
Legal Research Bench (Vals AI)46.1%36.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%59.7%Kimi K3
BioMysteryBench (Vals AI)72.6%Not measuredOnly Kimi K3 measured
Terminal-Bench-Science (Vals AI)1.4%0.0%Kimi K3
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
APEX-Agents47.8%47.5%Kimi K3
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly Kimi K3 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
GPQA Diamond92.9%88.9%Kimi K3
LiveBench reasoning90.7%80.0%Kimi K3
MMMU Pro (Vals AI)88.2%83.9%Kimi K3
GPQA Diamond (Artificial Analysis run)93.5%90.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)46.9%33.9%Kimi K3
GPQA Diamond (Epoch AI run)93.1%Not measuredOnly Kimi K3 measured
ARC-AGI94.5%87.5%Kimi K3
ARC-AGI-260.4%42.4%Kimi K3
SimpleBench60.7%Not measuredOnly Kimi K3 measured
Chess puzzles37.0%Not measuredOnly Kimi K3 measured
Mystery game puzzles26.0%Not measuredOnly Kimi K3 measured
LMArena Text: hard prompts14951459Kimi K3
LMArena Text: expert15201479Kimi K3
LMArena Text: hard prompts in English14961461Kimi K3
LMArena Vision: diagramsNot measured1285Only Qwen3.8 27B measured
LMArena Vision: homeworkNot measured1295Only Qwen3.8 27B measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
OTIS Mock AIME97.2%Not measuredOnly Kimi K3 measured
FrontierMath, tiers 1 to 372.2%Not measuredOnly Kimi K3 measured
FrontierMath, tier 439.0%Not measuredOnly Kimi K3 measured
ProofBench87.0%16.0%Kimi K3
LMArena Text: math14941455Kimi K3
LMArena Text: mathematical work15051458Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
MMLU Pro88.0%84.3%Kimi K3
LegalBench (Vals AI)86.2%82.4%Kimi K3
CorpFin (Vals AI)71.6%Not measuredOnly Kimi K3 measured
TaxEval (Vals AI)75.7%70.8%Kimi K3
MortgageTax (Vals AI)66.3%64.9%Kimi K3
MedCode (Vals AI)49.4%28.7%Kimi K3
SimpleQA Verified50.6%Not measuredOnly Kimi K3 measured
LMArena Text: science15081467Kimi K3
LMArena Text: medicine and healthcare14891437Kimi K3
LMArena Text: legal and government15031447Kimi K3
LMArena Text: business and finance14701438Kimi K3
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index10
Web design benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
Design Arena: websites1336Not measuredOnly Kimi K3 measured
Design Arena: UI components1345Not measuredOnly Kimi K3 measured
Design Arena: game dev1361Not measuredOnly Kimi K3 measured
Design Arena: data viz1350Not measuredOnly Kimi K3 measured
Design Arena: 3D1388Not measuredOnly Kimi K3 measured
Design Arena: all code categories1361Not measuredOnly Kimi K3 measured
Design Arena: SVG1301Not measuredOnly Kimi K3 measured
LiveBench design77.2%75.9%Kimi K3
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index240
General benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%76.6%Kimi K3
Public Benefits Bench (Vals AI)68.2%Not measuredOnly Kimi K3 measured
SAGE (Vals AI)52.8%52.4%Kimi K3
MedScribe (Vals AI)88.0%83.8%Kimi K3
Vals Multimodal Index73.4%Not measuredOnly Kimi K3 measured
Long context reasoning (AA-LCR)88.7%82.0%Kimi K3
DTBench91.2%88.0%Kimi K3
LMCA52.7%41.4%Kimi K3
Surface Evolver Bench95.0%45.0%Kimi K3
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761440Kimi K3
LMArena Text: instruction following14851436Kimi K3
LMArena Text: creative writing14571383Kimi K3
LMArena VisionNot measured1269Only Qwen3.8 27B measured
LMArena Text: English14811448Kimi K3
LMArena Text: non-English14661428Kimi K3
LMArena Text: Chinese15291501Kimi K3
LMArena Text: German14901443Kimi K3
LMArena Text: Japanese14941387Kimi K3
LMArena Text: Korean14601384Kimi K3
LMArena Text: French14921465Kimi K3
LMArena Text: Spanish14721449Kimi K3
LMArena Text: Russian14851415Kimi K3
LMArena Text: Polish14581439Kimi K3
LMArena Text: multi-turn14891440Kimi K3
LMArena Text: longer queries14941448Kimi K3
LMArena Text: writing and language14711405Kimi K3
LMArena Text: entertainment and media14531393Kimi K3
LMArena Vision: EnglishNot measured1267Only Qwen3.8 27B measured
LMArena Vision: ChineseNot measured1326Only Qwen3.8 27B measured
LMArena Vision: reading textNot measured1281Only Qwen3.8 27B measured
LMArena Vision: humorNot measured1235Only Qwen3.8 27B measured
LMArena Vision: creative writingNot measured1237Only Qwen3.8 27B measured
Neither model has a result on the other 12 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and Qwen3.8 27B
BenchmarkKimi K3Qwen3.8 27BLeader
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

Kimi K3$0.0062Fits in one request
Qwen3.8 27B$0.0007Fits in one request

Qwen3.8 27B costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.048Fits in one request
Qwen3.8 27B$0.0060Fits in one request

Qwen3.8 27B costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.167Fits in one request
Qwen3.8 27B$0.021Fits in one request

Qwen3.8 27B 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 Kimi K3 and Qwen3.8 27B
SpecificationMoonshotAI Kimi K3Qwen3.8 27B
MakerMoonshot AIQwen
WeightsOpen weightsOpen weights
ReleasedJuly 16, 2026August 14, 2026
Context window1.05M1M
Input $/Mtok$0.239$0.04
Output $/Mtok$11.936$1.35
Coding index61.873.6
Independent measurements behind it22
Cost per solved task$0.81$1.26
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Qwen3.8 27B for coding?

Pick Qwen3.8 27B for coding: it scores 73.6 on the Vibe Coding Index against 61.8 for Kimi K3. Pick Kimi K3 when a solved task costs $0.81 against $1.26, or when the context window is larger, 1.05M against 1M tokens.

Which is cheaper, Kimi K3 or Qwen3.8 27B?

Kimi K3 costs $0.239 per million input tokens and $11.936 per million output tokens; Qwen3.8 27B costs $0.04 and $1.35. Per solved SWE-bench Verified task, Kimi K3 costs $0.81 and Qwen3.8 27B $1.26.

Which has the bigger context window, Kimi K3 or Qwen3.8 27B?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Kimi K3 vs Qwen3.8 27B comparison based on?

76 benchmarks have a result for both models as of October 21, 2026. Kimi K3's coding index rests on 2 independent benchmarks and Qwen3.8 27B's on 2. Where only one model has a result, the page says so instead of naming a winner.

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