LLMBenchmark.ai

Enter opens the highlighted result. Esc closes.

GLM 5.3 Flash vs Grok 4.6

Updated October 21, 2026. 97 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GLM 5.3 Flash Replace Grok 4.6
GLM 5.3 FlashZ.ai
Coding
71.0
Overall
41.8
Output $/M
$0.50
49
Grok 4.6xAI
Coding
76.4
Overall
44.3
Output $/M
$6.00
48
vs boards won of 97 shared

Decision reading

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 71.0 for GLM 5.3 Flash.

Pick GLM 5.3 Flash when output tokens cost 12.0x less, or when a solved task costs $0.02 against $0.82.

Model AGLM 5.3 FlashZ.ai71.0/1002 independent benchmarks$0.02 per solved taskModel BGrok 4.6xAI76.4/1002 independent benchmarks$0.82 per solved task
Shared results
97
GLM 5.3 Flash only
5
Grok 4.6 only
26
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
GLM 5.3 Flash 71.0 from 2 benchmarks, Grok 4.6 76.4 from 2 benchmarks.
Widest category
Math, 13.3 points apart on average over 6 shared benchmarks.
Widest single gap
Vibe Code Bench (Vals AI): GLM 5.3 Flash 30.8% against Grok 4.6 76.2%, 45.5 points apart on a 0 to 100 scale.
Output price
GLM 5.3 Flash $0.50 against Grok 4.6 $6.00 per million output tokens, 12.0x apart.
Context window
GLM 5.3 Flash takes 1.05M tokens, Grok 4.6 500K.

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 FlashBarsGrok 4.6Ties
Coding617
Intelligence02
Agentic work28
Reasoning68
Math24
Knowledge52
Web design36
General251
All shared boards4948
CodingLike-for-likeFour of these boards feed the Vibe Coding Index617
Coding benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
LiveBench coding80.6%89.1%Grok 4.6
LMArena WebDev16071617Grok 4.6
AA Coding Index71.576.8Grok 4.6
LiveCodeBench (Vals AI)80.5%88.2%Grok 4.6
SWE-bench Verified (Vals AI)92.0%95.6%Grok 4.6
Terminal-Bench 4 (Vals AI)37.4%17.2%GLM 5.3 Flash
Vibe Code Bench (Vals AI)30.8%76.2%Grok 4.6
Code migration (Vals AI)20.5%44.6%Grok 4.6
ProgramBench (Vals AI)0.0%1.0%Grok 4.6
IOI (Vals AI)52.5%47.6%GLM 5.3 Flash
Terminal-Bench 2.1 (Vals AI)62.9%78.3%Grok 4.6
Vibe Code Bench 1-100 (Vals AI)16.0%14.8%GLM 5.3 Flash
SkillsBench (Vals AI)40.2%55.8%Grok 4.6
CyberBench (Vals AI)67.9%67.7%GLM 5.3 Flash
SciCode51.6%56.5%Grok 4.6
FrontierCode31.8%48.0%Grok 4.6
FrontierSWE18.1%25.3%Grok 4.6
WeirdMLNot measured67.3%Only Grok 4.6 measured
ALE-Bench303.61508.1Grok 4.6
LMArena Text: coding15071466GLM 5.3 Flash
LMArena Text: software and IT15001457GLM 5.3 Flash
LMArena WebDev: React16241631Grok 4.6
LMArena WebDev: HTML15771597Grok 4.6
LMArena WebDev: from an image15781603Grok 4.6
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 Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
AA Intelligence Index41.844.3Grok 4.6
Epoch Capabilities Index153.1156.6Grok 4.6
Agentic workLike-for-likePublic boards, shown as published, kept out of the index28
Agentic work benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
AA Agentic Index50.953.0Grok 4.6
Design Arena: agents building web appsNot measured1247Only Grok 4.6 measured
Design Arena: agents building full-stack appsNot measured1264Only Grok 4.6 measured
Design Arena: agents building mobile appsNot measured1234Only Grok 4.6 measured
Design Arena: agents building Android appsNot measured1297Only Grok 4.6 measured
Design Arena: agents building Godot gamesNot measured1276Only Grok 4.6 measured
Design Arena: agents building gamesNot measured1208Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1249Only Grok 4.6 measured
Design Arena: PowerPoint slidesNot measured1241Only Grok 4.6 measured
LiveBench research70.1%84.5%Grok 4.6
LiveBench browser84.0%64.0%GLM 5.3 Flash
LiveBench long agentic28.4%40.7%Grok 4.6
SREBench (Vals AI)0.8%Not measuredOnly GLM 5.3 Flash measured
Finance Agent (Vals AI)57.9%53.7%GLM 5.3 Flash
Tax Agent Bench (Vals AI)31.6%33.1%Grok 4.6
Legal Research Bench (Vals AI)45.2%48.1%Grok 4.6
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly GLM 5.3 Flash measured
Excel Modeling Benchmark (Vals AI)55.9%62.7%Grok 4.6
BioMysteryBench (Vals AI)Not measured72.2%Only Grok 4.6 measured
Terminal-Bench-Science (Vals AI)2.9%11.4%Grok 4.6
Vals Science IndexNot measured38.1%Only Grok 4.6 measured
Time Horizon Index (Vals AI)Not measured5.8%Only Grok 4.6 measured
APEX-Agents52.8%65.3%Grok 4.6
Vending-Bench 2Not measured$9,047Only Grok 4.6 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index68
Reasoning benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
GPQA Diamond86.4%94.7%Grok 4.6
LiveBench reasoning77.6%91.2%Grok 4.6
MysteryMechanism (Vals AI)Not measured30.6%Only Grok 4.6 measured
MMMU Pro (Vals AI)86.0%Not measuredOnly GLM 5.3 Flash measured
GPQA Diamond (Artificial Analysis run)91.2%94.9%Grok 4.6
Humanity's Last Exam (Artificial Analysis run)39.9%44.1%Grok 4.6
GPQA Diamond (Epoch AI run)90.2%94.0%Grok 4.6
ARC-AGI91.0%87.5%GLM 5.3 Flash
ARC-AGI-265.8%67.1%Grok 4.6
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles21.0%33.0%Grok 4.6
Mystery game puzzles8.0%34.0%Grok 4.6
EBR-benchNot measured30.5%Only Grok 4.6 measured
LMArena Text: hard prompts14901448GLM 5.3 Flash
LMArena Text: expert15111469GLM 5.3 Flash
LMArena Text: hard prompts in English14881445GLM 5.3 Flash
LMArena Vision: diagrams13171285GLM 5.3 Flash
LMArena Vision: homework13181283GLM 5.3 Flash
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
OTIS Mock AIME93.9%99.2%Grok 4.6
FrontierMath, tiers 1 to 355.8%66.0%Grok 4.6
FrontierMath, tier 417.1%31.7%Grok 4.6
ProofBench21.0%51.0%Grok 4.6
LMArena Text: math15031417GLM 5.3 Flash
LMArena Text: mathematical work14971464GLM 5.3 Flash
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index52
Knowledge benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
MMLU Pro86.1%89.4%Grok 4.6
LegalBench (Vals AI)83.9%86.3%Grok 4.6
CorpFin (Vals AI)Not measured66.2%Only Grok 4.6 measured
TaxEval (Vals AI)75.6%71.1%GLM 5.3 Flash
MortgageTax (Vals AI)Not measured64.2%Only Grok 4.6 measured
MedCode (Vals AI)Not measured44.7%Only Grok 4.6 measured
SimpleQA VerifiedNot measured49.3%Only Grok 4.6 measured
LMArena Text: science14841437GLM 5.3 Flash
LMArena Text: medicine and healthcare14751420GLM 5.3 Flash
LMArena Text: legal and government14731429GLM 5.3 Flash
LMArena Text: business and finance14601416GLM 5.3 Flash
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index36
Web design benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
Design Arena: websites12721289Grok 4.6
Design Arena: UI components13161294GLM 5.3 Flash
Design Arena: game dev12791296Grok 4.6
Design Arena: data viz12621283Grok 4.6
Design Arena: 3D13161277GLM 5.3 Flash
Design Arena: all code categories12821292Grok 4.6
Design Arena: SVG12841239GLM 5.3 Flash
Design Arena: ASCII art12691278Grok 4.6
LiveBench design77.2%79.8%Grok 4.6
GeneralLike-for-likePublic boards, shown as published, kept out of the index251
General benchmarks for GLM 5.3 Flash and Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
Vals Index50.9%Not measuredOnly GLM 5.3 Flash measured
LiveBench data analysis76.4%75.3%GLM 5.3 Flash
Public Benefits Bench (Vals AI)Not measured66.8%Only Grok 4.6 measured
SAGE (Vals AI)Not measured28.9%Only Grok 4.6 measured
MedScribe (Vals AI)88.9%86.5%GLM 5.3 Flash
Long context reasoning (AA-LCR)80.0%81.0%Grok 4.6
DTBenchNot measured97.3%Only Grok 4.6 measured
LMCANot measured48.5%Only Grok 4.6 measured
Surface Evolver Bench52.5%Not measuredOnly GLM 5.3 Flash measured
Furniture assemblyNot measured40.0%Only Grok 4.6 measured
LMArena Text14711429GLM 5.3 Flash
LMArena Text: instruction following14781431GLM 5.3 Flash
LMArena Text: creative writing14411426GLM 5.3 Flash
LMArena Vision12941263GLM 5.3 Flash
LMArena Text: English14741433GLM 5.3 Flash
LMArena Text: non-English14621420GLM 5.3 Flash
LMArena Text: Chinese15311476GLM 5.3 Flash
LMArena Text: German14621426GLM 5.3 Flash
LMArena Text: Japanese14441378GLM 5.3 Flash
LMArena Text: Korean14361391GLM 5.3 Flash
LMArena Text: French14911455GLM 5.3 Flash
LMArena Text: Spanish14751414GLM 5.3 Flash
LMArena Text: Russian14651421GLM 5.3 Flash
LMArena Text: Polish14501430GLM 5.3 Flash
LMArena Text: multi-turn14691425GLM 5.3 Flash
LMArena Text: longer queries14811456GLM 5.3 Flash
LMArena Text: writing and language14551429GLM 5.3 Flash
LMArena Text: entertainment and media14401421GLM 5.3 Flash
LMArena Vision: English12951270GLM 5.3 Flash
LMArena Vision: Chinese13631289GLM 5.3 Flash
LMArena Vision: reading text12991272GLM 5.3 Flash
LMArena Vision: humor12791270GLM 5.3 Flash
LMArena Vision: creative writing12701262GLM 5.3 Flash
LMArena DocumentNot measured1452Only Grok 4.6 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 Grok 4.6
BenchmarkGLM 5.3 FlashGrok 4.6Leader
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
Grok 4.6$0.0050Fits 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
Grok 4.6$0.118Fits 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
Grok 4.6$0.460Fits 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 Grok 4.6
SpecificationZ.ai GLM 5.3 FlashSpaceXAI Grok 4.6
MakerZ.aixAI
WeightsOpen weightsNo public weights listed
ReleasedAugust 26, 2026August 12, 2026
Context window1.05M500K
Input $/Mtok$0.15$2.00
Output $/Mtok$0.50$6.00
Coding index71.076.4
Independent measurements behind it22
Cost per solved task$0.02$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.3 Flash better than Grok 4.6 for coding?

Pick Grok 4.6 for coding: it scores 76.4 on the Vibe Coding Index against 71.0 for GLM 5.3 Flash. Pick GLM 5.3 Flash when output tokens cost 12.0x less, or when a solved task costs $0.02 against $0.82.

Which is cheaper, GLM 5.3 Flash or Grok 4.6?

GLM 5.3 Flash costs $0.15 per million input tokens and $0.50 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GLM 5.3 Flash costs $0.02 and Grok 4.6 $0.82.

Which has the bigger context window, GLM 5.3 Flash or Grok 4.6?

GLM 5.3 Flash, with 1.05M tokens against 500K.

How many benchmarks is the GLM 5.3 Flash vs Grok 4.6 comparison based on?

97 benchmarks have a result for both models as of October 21, 2026. GLM 5.3 Flash's coding index rests on 2 independent benchmarks and Grok 4.6's on 2. Where only one model has a result, the page says so instead of naming a winner.

Compare next

Embed this comparison on your site

Free under CC BY 4.0, while the source link stays visible. Preview the frame · Terms and other embeds

<iframe src="https://llmbenchmark.ai/embed/compare/glm-5-3-flash-vs-grok-4-6" title="GLM 5.3 Flash vs Grok 4.6, 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/glm-5-3-flash-vs-grok-4-6">LLMBenchmark.ai, GLM 5.3 Flash vs Grok 4.6</a></p>