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Kimi K3 vs Qwen3.5-Flash

Kimi K3 leads Qwen3.5-Flash on coding, 62.3 to 41.1 on the Vibe Coding Index, and Qwen3.5-Flash costs 57.7x less per output token ($0.26 vs $15.00 per million). Updated October 22, 2026; 53 benchmarks have a result for both.

Replace Kimi K3 Replace Qwen3.5-Flash
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
52
Qwen3.5-FlashQwen
Coding
41.1
Overall
50.1
Output $/M
$0.26
1
vs boards won of 53 shared

Kimi K3 or Qwen3.5-Flash: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash.

Pick Qwen3.5-Flash for output tokens 57.7x cheaper ($0.26 vs $15.00 per million) and a lower cost per solved task ($0.40 against $0.81).

Model AKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved taskModel BQwen3.5-FlashQwen41.1/1002 independent benchmarks$0.40 per solved task
Shared results
53
Kimi K3 only
64
Qwen3.5-Flash only
2
Like-for-like categories
6 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
Kimi K3 62.3 from 6 benchmarks, Qwen3.5-Flash 41.1 from 2 benchmarks.
Widest category
Coding, 34.6 points apart on average over 8 shared benchmarks.
Widest single gap
LMArena WebDev: React: Kimi K3 1670 against Qwen3.5-Flash 1229, 61.8 points apart on a 0 to 100 scale.
Output price
Kimi K3 $15.00 against Qwen3.5-Flash $0.26 per million output tokens, 57.7x apart.
Context window
Kimi K3 takes 1.05M tokens, Qwen3.5-Flash 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 K3BarsQwen3.5-FlashTies
Coding80
Intelligence10
Reasoning80
Math40
Knowledge101
General210
All shared boards521
CodingLike-for-likeSix of these boards feed the Vibe Coding Index80
Coding benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
LiveBench coding59.3%Not measuredOnly Kimi K3 measured
LMArena WebDev16551244Kimi K3
AA Coding Index76.2Not measuredOnly Kimi K3 measured
LiveCodeBench (Vals AI)87.2%83.3%Kimi K3
SWE-bench Verified (Vals AI)93.4%64.4%Kimi K3
Terminal-Bench 4 (Vals AI)17.2%Not measuredOnly Kimi K3 measured
Vibe Code Bench (Vals AI)85.0%Not measuredOnly Kimi K3 measured
Code migration (Vals AI)16.1%Not measuredOnly Kimi K3 measured
ProgramBench (Vals AI)2.0%Not measuredOnly Kimi K3 measured
IOI (Vals AI)48.9%Not measuredOnly Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)80.9%Not measuredOnly Kimi K3 measured
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
CyberBench (Vals AI)75.2%Not measuredOnly Kimi K3 measured
SciCode59.5%Not measuredOnly Kimi K3 measured
FrontierCode44.2%Not measuredOnly Kimi K3 measured
FrontierSWE25.9%Not measuredOnly Kimi K3 measured
WeirdML82.6%Not measuredOnly Kimi K3 measured
ALE-Bench1524.5265.9Kimi K3
LMArena Text: coding15081412Kimi K3
LMArena Text: software and IT14991416Kimi K3
LMArena WebDev: React16701229Kimi K3
LMArena WebDev: HTML16441291Kimi K3
LMArena WebDev: from an image1579Not measuredOnly Kimi K3 measured
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index10
Intelligence benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
AA Intelligence Index43.6Not measuredOnly Kimi K3 measured
Epoch Capabilities Index157.9143.5Kimi K3
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index24 boards, none shared
Agentic work benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
AA Agentic Index50.0Not measuredOnly Kimi K3 measured
Design Arena: agents building web apps1295Not measuredOnly Kimi K3 measured
Design Arena: agents building full-stack apps1315Not measuredOnly Kimi K3 measured
Design Arena: agents building mobile apps1269Not measuredOnly Kimi K3 measured
Design Arena: agents building Android apps1253Not 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 slides1206Not measuredOnly Kimi K3 measured
Design Arena: PowerPoint slides1247Not measuredOnly Kimi K3 measured
Design Arena: spreadsheets1070Not measuredOnly Kimi K3 measured
LiveBench research79.0%Not measuredOnly Kimi K3 measured
LiveBench browser16.0%Not measuredOnly Kimi K3 measured
LiveBench long agentic42.8%Not measuredOnly Kimi K3 measured
Finance Agent (Vals AI)53.1%Not measuredOnly Kimi K3 measured
Tax Agent Bench (Vals AI)33.4%Not measuredOnly Kimi K3 measured
Legal Research Bench (Vals AI)46.1%Not measuredOnly Kimi K3 measured
Harvey's Legal Agent Benchmark (Vals AI)12.9%Not measuredOnly Kimi K3 measured
Excel Modeling Benchmark (Vals AI)66.7%Not measuredOnly Kimi K3 measured
BioMysteryBench (Vals AI)72.6%Not measuredOnly Kimi K3 measured
Terminal-Bench-Science (Vals AI)1.4%Not measuredOnly Kimi K3 measured
Time Horizon Index (Vals AI)10.5%Not measuredOnly Kimi K3 measured
APEX-Agents47.8%Not measuredOnly Kimi K3 measured
PostTrainBench32.0%Not measuredOnly Kimi K3 measured
Vending-Bench 2$5,165Not measuredOnly Kimi K3 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index80
Reasoning benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
GPQA Diamond92.9%82.8%Kimi K3
LiveBench reasoning90.7%Not measuredOnly Kimi K3 measured
MMMU Pro (Vals AI)88.2%81.9%Kimi K3
GPQA Diamond (Artificial Analysis run)93.5%Not measuredOnly Kimi K3 measured
Humanity's Last Exam (Artificial Analysis run)46.9%Not measuredOnly Kimi K3 measured
GPQA Diamond (Epoch AI run)93.1%82.3%Kimi K3
ARC-AGI94.5%Not measuredOnly Kimi K3 measured
ARC-AGI-260.4%Not measuredOnly Kimi K3 measured
SimpleBench60.7%Not measuredOnly Kimi K3 measured
Chess puzzles37.0%14.0%Kimi K3
Mystery game puzzles26.0%20.0%Kimi K3
LMArena Text: hard prompts14951403Kimi K3
LMArena Text: expert15201407Kimi K3
LMArena Text: hard prompts in English14961409Kimi K3
Neither model has a result on the other 8 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
AIMENot measured92.5%Only Qwen3.5-Flash measured
OTIS Mock AIME97.2%84.4%Kimi K3
FrontierMath, tiers 1 to 372.2%18.2%Kimi K3
FrontierMath, tier 439.0%Not measuredOnly Kimi K3 measured
ProofBench87.0%Not measuredOnly Kimi K3 measured
LMArena Text: math14941407Kimi K3
LMArena Text: mathematical work15051413Kimi K3
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index101
Knowledge benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
MMLU Pro88.0%84.1%Kimi K3
LegalBench (Vals AI)86.2%84.3%Kimi K3
CaseLaw (Vals AI)Not measured56.0%Only Qwen3.5-Flash measured
CorpFin (Vals AI)71.6%63.6%Kimi K3
TaxEval (Vals AI)75.7%72.2%Kimi K3
MortgageTax (Vals AI)66.3%67.4%Qwen3.5-Flash
MedCode (Vals AI)49.4%33.0%Kimi K3
SimpleQA Verified50.6%20.3%Kimi K3
LMArena Text: science15081415Kimi K3
LMArena Text: medicine and healthcare14891407Kimi K3
LMArena Text: legal and government15031398Kimi K3
LMArena Text: business and finance14701394Kimi K3
Neither model has a result on the other 6 boards here
Web designDirectional onlyPublic boards, shown as published, kept out of the index8 boards, none shared
Web design benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
Design Arena: websites1334Not measuredOnly Kimi K3 measured
Design Arena: UI components1341Not measuredOnly Kimi K3 measured
Design Arena: game dev1358Not measuredOnly Kimi K3 measured
Design Arena: data viz1351Not measuredOnly Kimi K3 measured
Design Arena: 3D1387Not measuredOnly Kimi K3 measured
Design Arena: all code categories1360Not measuredOnly Kimi K3 measured
Design Arena: SVG1302Not measuredOnly Kimi K3 measured
LiveBench design77.2%Not measuredOnly Kimi K3 measured
Neither model has a result on the other 1 board here
GeneralLike-for-likePublic boards, shown as published, kept out of the index210
General benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
Vals Index53.0%Not measuredOnly Kimi K3 measured
LiveBench data analysis78.7%Not measuredOnly Kimi K3 measured
Public Benefits Bench (Vals AI)68.2%Not measuredOnly Kimi K3 measured
SAGE (Vals AI)52.8%42.5%Kimi K3
MedScribe (Vals AI)88.0%70.6%Kimi K3
Vals Multimodal Index73.4%Not measuredOnly Kimi K3 measured
Long context reasoning (AA-LCR)88.7%Not measuredOnly Kimi K3 measured
DTBench91.2%82.9%Kimi K3
LMCA52.7%29.1%Kimi K3
Surface Evolver Bench95.0%Not measuredOnly Kimi K3 measured
Furniture assembly34.2%Not measuredOnly Kimi K3 measured
LMArena Text14761397Kimi K3
LMArena Text: instruction following14851374Kimi K3
LMArena Text: creative writing14571343Kimi K3
LMArena Text: English14811404Kimi K3
LMArena Text: non-English14661385Kimi K3
LMArena Text: Chinese15291445Kimi K3
LMArena Text: German14901390Kimi K3
LMArena Text: Japanese14941369Kimi K3
LMArena Text: Korean14601344Kimi K3
LMArena Text: French14921413Kimi K3
LMArena Text: Spanish14721400Kimi K3
LMArena Text: Russian14851380Kimi K3
LMArena Text: Polish14581376Kimi K3
LMArena Text: multi-turn14891393Kimi K3
LMArena Text: longer queries14941392Kimi K3
LMArena Text: writing and language14711369Kimi K3
LMArena Text: entertainment and media14531347Kimi K3
Neither model has a result on the other 18 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Kimi K3 and Qwen3.5-Flash
BenchmarkKimi K3Qwen3.5-FlashLeader
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$0.011Fits in one request
Qwen3.5-Flash$0.0002Fits in one request

Qwen3.5-Flash costs less

Repository review

50K input + 3K output tokens

Kimi K3$0.195Fits in one request
Qwen3.5-Flash$0.0040Fits in one request

Qwen3.5-Flash costs less

Agent loop

200K input + 10K output tokens

Kimi K3$0.750Fits in one request
Qwen3.5-Flash$0.016Fits in one request

Qwen3.5-Flash 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 Qwen3.5-Flash
SpecificationMoonshotAI Kimi K3Qwen3.5-Flash
MakerMoonshot AIQwen
WeightsOpen weightsNo public weights listed
ReleasedJuly 16, 2026February 25, 2026
Context window1.05M1M
Input $/Mtok$3.00$0.065
Output $/Mtok$15.00$0.26
Coding index62.341.1
Independent measurements behind it62
Cost per solved task$0.81$0.40
SourceOpenRouter listingOpenRouter listing

Questions

Is Kimi K3 better than Qwen3.5-Flash for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 41.1 for Qwen3.5-Flash. Pick Qwen3.5-Flash for output tokens 57.7x cheaper ($0.26 vs $15.00 per million) and a lower cost per solved task ($0.40 against $0.81).

Which is cheaper, Kimi K3 or Qwen3.5-Flash?

Kimi K3 costs $3.00 per million input tokens and $15.00 per million output tokens; Qwen3.5-Flash costs $0.065 and $0.26. Per solved SWE-bench Verified task, Kimi K3 costs $0.81 and Qwen3.5-Flash $0.40.

Which has the bigger context window, Kimi K3 or Qwen3.5-Flash?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Kimi K3 vs Qwen3.5-Flash comparison based on?

53 benchmarks have a result for both models as of October 22, 2026. Kimi K3's coding index rests on 6 independent benchmarks and Qwen3.5-Flash's on 2. Where only one model has a result, the page says so instead of naming a winner.

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<iframe src="https://llmbenchmark.ai/embed/compare/kimi-k3-vs-qwen3-5-flash-02-23" title="Kimi K3 vs Qwen3.5-Flash, 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/kimi-k3-vs-qwen3-5-flash-02-23">LLMBenchmark.ai, Kimi K3 vs Qwen3.5-Flash</a></p>