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DeepSeek V4 Flash 0731 vs Kimi K3

Updated October 21, 2026. 53 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace DeepSeek V4 Flash 0731 Replace Kimi K3
DeepSeek V4 Flash 0731DeepSeek
Coding
51.8
Overall
34.3
Output $/M
$0.396
7
Kimi K3Moonshot AI
Coding
62.3
Overall
43.6
Output $/M
$15.00
46
vs boards won of 53 shared

Decision reading

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 51.8 for DeepSeek V4 Flash 0731.

Pick DeepSeek V4 Flash 0731 when output tokens cost 37.9x less, or when a solved task costs $0.01 against $0.81.

Model ADeepSeek V4 Flash 0731DeepSeek51.8/1004 independent benchmarks$0.01 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
53
DeepSeek V4 Flash 0731 only
2
Kimi K3 only
64
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
DeepSeek V4 Flash 0731 51.8 from 4 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Web design, 17.1 points apart on average over 7 shared benchmarks.
Widest single gap
FrontierCode: DeepSeek V4 Flash 0731 18.8% against Kimi K3 44.2%, 39.0 points apart on a 0 to 100 scale.
Output price
DeepSeek V4 Flash 0731 $0.396 against Kimi K3 $15.00 per million output tokens, 37.9x apart.
Context window
Both take 1.05M tokens.

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
CategoryDeepSeek V4 Flash 0731BarsKimi K3Ties
Coding311
Intelligence02
Agentic work16
Reasoning36
Math04
Knowledge06
Web design07
General04
All shared boards746
CodingLike-for-likeSix of these boards feed the Vibe Coding Index311
Coding benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
LiveBench codingNot measured59.3%Only Kimi K3 measured
LMArena WebDevNot measured1655Only Kimi K3 measured
AA Coding Index69.176.2Kimi K3
LiveCodeBench (Vals AI)87.3%87.2%DeepSeek V4 Flash 0731
SWE-bench Verified (Vals AI)88.8%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)18.7%17.2%DeepSeek V4 Flash 0731
Vibe Code Bench (Vals AI)74.7%85.0%Kimi K3
Code migration (Vals AI)38.6%16.1%DeepSeek V4 Flash 0731
ProgramBench (Vals AI)0.0%2.0%Kimi K3
IOI (Vals AI)32.7%48.9%Kimi K3
Terminal-Bench 2.1 (Vals AI)67.0%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)50.7%Not measuredOnly DeepSeek V4 Flash 0731 measured
CyberBench (Vals AI)72.1%75.2%Kimi K3
SciCode50.3%59.5%Kimi K3
FrontierCode18.8%44.2%Kimi K3
FrontierSWENot measured25.9%Only Kimi K3 measured
WeirdML63.0%82.6%Kimi K3
ALE-Bench1306.11524.5Kimi K3
LMArena Text: codingNot measured1508Only Kimi K3 measured
LMArena Text: software and ITNot measured1499Only Kimi K3 measured
LMArena WebDev: ReactNot measured1670Only Kimi K3 measured
LMArena WebDev: HTMLNot measured1644Only Kimi K3 measured
LMArena WebDev: from an imageNot measured1579Only Kimi K3 measured
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
AA Intelligence Index34.343.6Kimi K3
Epoch Capabilities Index154.8157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index16
Agentic work benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
AA Agentic Index41.050.0Kimi K3
Design Arena: agents building web appsNot measured1295Only Kimi K3 measured
Design Arena: agents building full-stack appsNot measured1315Only Kimi K3 measured
Design Arena: agents building mobile appsNot measured1268Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1256Only Kimi K3 measured
Design Arena: agents building Godot gamesNot measured1223Only Kimi K3 measured
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1256Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1273Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1054Only Kimi K3 measured
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)49.5%53.1%Kimi K3
Tax Agent Bench (Vals AI)28.1%33.4%Kimi K3
Legal Research Bench (Vals AI)30.3%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)57.0%66.7%Kimi K3
BioMysteryBench (Vals AI)64.4%72.6%Kimi K3
Terminal-Bench-Science (Vals AI)4.3%1.4%DeepSeek V4 Flash 0731
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
APEX-AgentsNot measured47.8%Only Kimi K3 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only 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 index36
Reasoning benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
GPQA Diamond89.9%92.9%Kimi K3
LiveBench reasoningNot measured90.7%Only Kimi K3 measured
MMMU Pro (Vals AI)Not measured88.2%Only Kimi K3 measured
GPQA Diamond (Artificial Analysis run)90.8%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)38.6%46.9%Kimi K3
GPQA Diamond (Epoch AI run)91.0%93.1%Kimi K3
ARC-AGI89.0%94.5%Kimi K3
ARC-AGI-261.4%60.4%DeepSeek V4 Flash 0731
SimpleBench61.1%60.7%DeepSeek V4 Flash 0731
Chess puzzles32.0%37.0%Kimi K3
Mystery game puzzles34.0%26.0%DeepSeek V4 Flash 0731
LMArena Text: hard promptsNot measured1495Only Kimi K3 measured
LMArena Text: expertNot measured1520Only Kimi K3 measured
LMArena Text: hard prompts in EnglishNot measured1496Only Kimi K3 measured
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index04
Math benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
OTIS Mock AIME94.4%97.2%Kimi K3
FrontierMath, tiers 1 to 357.5%72.2%Kimi K3
FrontierMath, tier 424.4%39.0%Kimi K3
ProofBench56.0%87.0%Kimi K3
LMArena Text: mathNot measured1494Only Kimi K3 measured
LMArena Text: mathematical workNot measured1505Only Kimi K3 measured
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
MMLU Pro86.2%88.0%Kimi K3
LegalBench (Vals AI)77.7%86.2%Kimi K3
CorpFin (Vals AI)61.9%71.6%Kimi K3
TaxEval (Vals AI)70.7%75.7%Kimi K3
MortgageTax (Vals AI)Not measured66.3%Only Kimi K3 measured
MedCode (Vals AI)41.4%49.4%Kimi K3
SimpleQA Verified33.6%50.6%Kimi K3
LMArena Text: scienceNot measured1508Only Kimi K3 measured
LMArena Text: medicine and healthcareNot measured1489Only Kimi K3 measured
LMArena Text: legal and governmentNot measured1503Only Kimi K3 measured
LMArena Text: business and financeNot measured1470Only Kimi K3 measured
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 DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
Design Arena: websites12381335Kimi K3
Design Arena: UI components12351344Kimi K3
Design Arena: game dev12081360Kimi K3
Design Arena: data viz11801350Kimi K3
Design Arena: 3D12091388Kimi K3
Design Arena: all code categories12301361Kimi K3
Design Arena: SVG11851302Kimi K3
Design Arena: ASCII art1090Not measuredOnly DeepSeek V4 Flash 0731 measured
LiveBench designNot measured77.2%Only Kimi K3 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index04
General benchmarks for DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysisNot measured78.7%Only Kimi K3 measured
Public Benefits Bench (Vals AI)Not measured68.2%Only Kimi K3 measured
SAGE (Vals AI)Not measured52.8%Only Kimi K3 measured
MedScribe (Vals AI)80.4%88.0%Kimi K3
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)79.7%88.7%Kimi K3
DTBench90.9%91.2%Kimi K3
LMCA41.7%52.7%Kimi K3
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena TextNot measured1476Only Kimi K3 measured
LMArena Text: instruction followingNot measured1485Only Kimi K3 measured
LMArena Text: creative writingNot measured1457Only Kimi K3 measured
LMArena Text: EnglishNot measured1481Only Kimi K3 measured
LMArena Text: non-EnglishNot measured1466Only Kimi K3 measured
LMArena Text: ChineseNot measured1529Only Kimi K3 measured
LMArena Text: GermanNot measured1490Only Kimi K3 measured
LMArena Text: JapaneseNot measured1494Only Kimi K3 measured
LMArena Text: KoreanNot measured1460Only Kimi K3 measured
LMArena Text: FrenchNot measured1492Only Kimi K3 measured
LMArena Text: SpanishNot measured1472Only Kimi K3 measured
LMArena Text: RussianNot measured1485Only Kimi K3 measured
LMArena Text: PolishNot measured1458Only Kimi K3 measured
LMArena Text: multi-turnNot measured1489Only Kimi K3 measured
LMArena Text: longer queriesNot measured1494Only Kimi K3 measured
LMArena Text: writing and languageNot measured1471Only Kimi K3 measured
LMArena Text: entertainment and mediaNot measured1453Only Kimi K3 measured
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 DeepSeek V4 Flash 0731 and Kimi K3
BenchmarkDeepSeek V4 Flash 0731Kimi 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

DeepSeek V4 Flash 0731$0.0003Fits in one request
Kimi K3$0.011Fits in one request

DeepSeek V4 Flash 0731 costs less

Repository review

50K input + 3K output tokens

DeepSeek V4 Flash 0731$0.0082Fits in one request
Kimi K3$0.195Fits in one request

DeepSeek V4 Flash 0731 costs less

Agent loop

200K input + 10K output tokens

DeepSeek V4 Flash 0731$0.032Fits in one request
Kimi K3$0.750Fits in one request

DeepSeek V4 Flash 0731 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 DeepSeek V4 Flash 0731 and Kimi K3
SpecificationDeepSeek V4 Flash 0731MoonshotAI Kimi K3
MakerDeepSeekMoonshot AI
WeightsOpen weightsOpen weights
ReleasedJuly 31, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$0.14$3.00
Output $/Mtok$0.396$15.00
Coding index51.862.3
Independent measurements behind it46
Cost per solved task$0.01$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is DeepSeek V4 Flash 0731 better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 51.8 for DeepSeek V4 Flash 0731. Pick DeepSeek V4 Flash 0731 when output tokens cost 37.9x less, or when a solved task costs $0.01 against $0.81.

Which is cheaper, DeepSeek V4 Flash 0731 or Kimi K3?

DeepSeek V4 Flash 0731 costs $0.14 per million input tokens and $0.396 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, DeepSeek V4 Flash 0731 costs $0.01 and Kimi K3 $0.81.

Which has the bigger context window, DeepSeek V4 Flash 0731 or Kimi K3?

Neither: both take 1.05M tokens.

How many benchmarks is the DeepSeek V4 Flash 0731 vs Kimi K3 comparison based on?

53 benchmarks have a result for both models as of October 21, 2026. DeepSeek V4 Flash 0731's coding index rests on 4 independent benchmarks and Kimi K3's on 6. 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/deepseek-v4-flash-0731-vs-kimi-k3">LLMBenchmark.ai, DeepSeek V4 Flash 0731 vs Kimi K3</a></p>