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GLM 5.3 Flash vs Kimi K3

Kimi K3 leads GLM 5.3 Flash on coding, 62.3 to 57.7 on the Vibe Coding Index, and GLM 5.3 Flash costs 30.0x less per output token ($0.50 vs $15.00 per million). Updated October 22, 2026; 91 benchmarks have a result for both.

Replace GLM 5.3 Flash Replace Kimi K3
GLM 5.3 FlashZ.ai
Coding
57.7
Overall
66.0
Output $/M
$0.50
15
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
75
vs boards won of 91 shared, 1 tied

GLM 5.3 Flash or Kimi K3: which to pick

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 57.7 for GLM 5.3 Flash.

Pick GLM 5.3 Flash for output tokens 30.0x cheaper ($0.50 vs $15.00 per million) and a lower cost per solved task ($0.02 against $0.81).

Model AGLM 5.3 FlashZ.ai57.7/1006 independent benchmarks$0.02 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
91
GLM 5.3 Flash only
11
Kimi K3 only
26
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
GLM 5.3 Flash 57.7 from 6 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 18.4 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: GLM 5.3 Flash 84.0% against Kimi K3 16.0%, 68.0 points apart on a 0 to 100 scale.
Output price
GLM 5.3 Flash $0.50 against Kimi K3 $15.00 per million output tokens, 30.0x 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
CategoryGLM 5.3 FlashBarsKimi K3Ties
Coding517
Intelligence02
Agentic work56
Reasoning112
Math15
Knowledge07
Web design071 tie
General319
All shared boards15751 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index517
Coding benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
LiveBench coding80.6%59.3%GLM 5.3 Flash
LMArena WebDev16071655Kimi K3
AA Coding Index71.576.2Kimi K3
LiveCodeBench (Vals AI)80.5%87.2%Kimi K3
SWE-bench Verified (Vals AI)92.0%93.4%Kimi K3
Terminal-Bench 4 (Vals AI)37.4%17.2%GLM 5.3 Flash
Vibe Code Bench (Vals AI)30.8%85.0%Kimi K3
Code migration (Vals AI)20.5%16.1%GLM 5.3 Flash
ProgramBench (Vals AI)0.0%2.0%Kimi K3
IOI (Vals AI)52.5%48.9%GLM 5.3 Flash
Terminal-Bench 2.1 (Vals AI)62.9%80.9%Kimi K3
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)16.0%18.2%Kimi K3
SkillsBench (Vals AI)40.2%Not measuredOnly GLM 5.3 Flash measured
CyberBench (Vals AI)67.9%75.2%Kimi K3
SciCode51.6%59.5%Kimi K3
FrontierCode31.8%44.2%Kimi K3
FrontierSWE18.1%25.9%Kimi K3
WeirdMLNot measured82.6%Only Kimi K3 measured
ALE-Bench303.61524.5Kimi K3
LMArena Text: coding15071508Kimi K3
LMArena Text: software and IT15001499GLM 5.3 Flash
LMArena WebDev: React16241670Kimi K3
LMArena WebDev: HTML15771644Kimi K3
LMArena WebDev: from an image15781579Kimi K3
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
AA Intelligence Index41.843.6Kimi K3
Epoch Capabilities Index153.1157.9Kimi K3
Agentic workLike-for-likePublic boards, shown as published, kept out of the index56
Agentic work benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
AA Agentic Index50.950.0GLM 5.3 Flash
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 measured1269Only Kimi K3 measured
Design Arena: agents building Android appsNot measured1253Only 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 measured1206Only Kimi K3 measured
Design Arena: PowerPoint slidesNot measured1248Only Kimi K3 measured
Design Arena: spreadsheetsNot measured1096Only Kimi K3 measured
LiveBench research70.1%79.0%Kimi K3
LiveBench browser84.0%16.0%GLM 5.3 Flash
LiveBench long agentic28.4%42.8%Kimi K3
SREBench (Vals AI)0.8%Not measuredOnly GLM 5.3 Flash measured
Finance Agent (Vals AI)57.9%53.1%GLM 5.3 Flash
Tax Agent Bench (Vals AI)31.6%33.4%Kimi K3
Legal Research Bench (Vals AI)45.2%46.1%Kimi K3
Harvey's Legal Agent Benchmark (Vals AI)10.4%12.9%Kimi K3
Excel Modeling Benchmark (Vals AI)55.9%66.7%Kimi K3
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)2.9%1.4%GLM 5.3 Flash
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
APEX-Agents52.8%47.8%GLM 5.3 Flash
PostTrainBenchNot measured32.0%Only Kimi K3 measured
Vending-Bench 2Not measured$5,165Only Kimi K3 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index112
Reasoning benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
GPQA Diamond86.4%92.9%Kimi K3
LiveBench reasoning77.6%90.7%Kimi K3
MMMU Pro (Vals AI)86.0%88.2%Kimi K3
GPQA Diamond (Artificial Analysis run)91.2%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)39.9%46.9%Kimi K3
GPQA Diamond (Epoch AI run)90.2%93.1%Kimi K3
ARC-AGI91.0%94.5%Kimi K3
ARC-AGI-265.8%60.4%GLM 5.3 Flash
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles21.0%37.0%Kimi K3
Mystery game puzzles8.0%26.0%Kimi K3
LMArena Text: hard prompts14901495Kimi K3
LMArena Text: expert15111520Kimi K3
LMArena Text: hard prompts in English14881496Kimi K3
LMArena Vision: diagrams1317Not measuredOnly GLM 5.3 Flash measured
LMArena Vision: homework1318Not measuredOnly GLM 5.3 Flash measured
Neither model has a result on the other 6 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index15
Math benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
OTIS Mock AIME93.9%97.2%Kimi K3
FrontierMath, tiers 1 to 355.8%72.2%Kimi K3
FrontierMath, tier 417.1%39.0%Kimi K3
ProofBench21.0%87.0%Kimi K3
LMArena Text: math15031494GLM 5.3 Flash
LMArena Text: mathematical work14971505Kimi K3
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index07
Knowledge benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
MMLU Pro86.1%88.0%Kimi K3
LegalBench (Vals AI)83.9%86.2%Kimi K3
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)75.6%75.7%Kimi K3
MortgageTax (Vals AI)Not measured66.3%Only Kimi K3 measured
MedCode (Vals AI)Not measured49.4%Only Kimi K3 measured
SimpleQA VerifiedNot measured50.6%Only Kimi K3 measured
LMArena Text: science14841508Kimi K3
LMArena Text: medicine and healthcare14751489Kimi K3
LMArena Text: legal and government14731503Kimi K3
LMArena Text: business and finance14601470Kimi K3
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
Design Arena: websites12711334Kimi K3
Design Arena: UI components13141340Kimi K3
Design Arena: game dev12771360Kimi K3
Design Arena: data viz12621352Kimi K3
Design Arena: 3D13151387Kimi K3
Design Arena: all code categories12811360Kimi K3
Design Arena: SVG12841302Kimi K3
Design Arena: ASCII art1267Not measuredOnly GLM 5.3 Flash measured
LiveBench design77.2%77.2%Tie
GeneralLike-for-likePublic boards, shown as published, kept out of the index319
General benchmarks for GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi K3Leader
Vals Index50.9%53.0%Kimi K3
LiveBench data analysis76.4%78.7%Kimi K3
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)88.9%88.0%GLM 5.3 Flash
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)80.0%88.7%Kimi K3
DTBenchNot measured91.2%Only Kimi K3 measured
LMCANot measured52.7%Only Kimi K3 measured
Surface Evolver Bench52.5%95.0%Kimi K3
Furniture assemblyNot measured34.2%Only Kimi K3 measured
LMArena Text14711476Kimi K3
LMArena Text: instruction following14781485Kimi K3
LMArena Text: creative writing14411457Kimi K3
LMArena Vision1294Not measuredOnly GLM 5.3 Flash measured
LMArena Text: English14741481Kimi K3
LMArena Text: non-English14621466Kimi K3
LMArena Text: Chinese15311529GLM 5.3 Flash
LMArena Text: German14621490Kimi K3
LMArena Text: Japanese14441494Kimi K3
LMArena Text: Korean14361460Kimi K3
LMArena Text: French14911492Kimi K3
LMArena Text: Spanish14751472GLM 5.3 Flash
LMArena Text: Russian14651485Kimi K3
LMArena Text: Polish14501458Kimi K3
LMArena Text: multi-turn14691489Kimi K3
LMArena Text: longer queries14811494Kimi K3
LMArena Text: writing and language14551471Kimi K3
LMArena Text: entertainment and media14401453Kimi K3
LMArena Vision: English1295Not measuredOnly GLM 5.3 Flash measured
LMArena Vision: Chinese1363Not measuredOnly GLM 5.3 Flash measured
LMArena Vision: reading text1299Not measuredOnly GLM 5.3 Flash measured
LMArena Vision: humor1279Not measuredOnly GLM 5.3 Flash measured
LMArena Vision: creative writing1270Not measuredOnly GLM 5.3 Flash 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 GLM 5.3 Flash and Kimi K3
BenchmarkGLM 5.3 FlashKimi 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

GLM 5.3 Flash$0.0004Fits in one request
Kimi K3$0.011Fits in one request

GLM 5.3 Flash costs less

Repository review

50K input + 3K output tokens

GLM 5.3 Flash$0.0090Fits in one request
Kimi K3$0.195Fits in one request

GLM 5.3 Flash costs less

Agent loop

200K input + 10K output tokens

GLM 5.3 Flash$0.035Fits in one request
Kimi K3$0.750Fits in one request

GLM 5.3 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 GLM 5.3 Flash and Kimi K3
SpecificationZ.ai GLM 5.3 FlashMoonshotAI Kimi K3
MakerZ.aiMoonshot AI
WeightsOpen weightsOpen weights
ReleasedAugust 26, 2026July 16, 2026
Context window1.05M1.05M
Input $/Mtok$0.15$3.00
Output $/Mtok$0.50$15.00
Coding index57.762.3
Independent measurements behind it66
Cost per solved task$0.02$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.3 Flash better than Kimi K3 for coding?

Pick Kimi K3 for coding: it scores 62.3 on the Vibe Coding Index against 57.7 for GLM 5.3 Flash. Pick GLM 5.3 Flash for output tokens 30.0x cheaper ($0.50 vs $15.00 per million) and a lower cost per solved task ($0.02 against $0.81).

Which is cheaper, GLM 5.3 Flash or Kimi K3?

GLM 5.3 Flash costs $0.15 per million input tokens and $0.50 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, GLM 5.3 Flash costs $0.02 and Kimi K3 $0.81.

Which has the bigger context window, GLM 5.3 Flash or Kimi K3?

Neither: both take 1.05M tokens.

How many benchmarks is the GLM 5.3 Flash vs Kimi K3 comparison based on?

91 benchmarks have a result for both models as of October 22, 2026. GLM 5.3 Flash's coding index rests on 6 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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