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GLM 5.3 Flash vs Grok 4.5

Updated October 21, 2026. 96 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 4.5
GLM 5.3 FlashZ.ai
Coding
71.0
Overall
41.8
Output $/M
$0.50
62
Grok 4.5xAI
Coding
75.5
Overall
38.8
Output $/M
$6.00
32
vs boards won of 96 shared, 2 tied

Decision reading

Pick Grok 4.5 for coding: it scores 75.5 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 $0.62.

Model AGLM 5.3 FlashZ.ai71.0/1002 independent benchmarks$0.02 per solved taskModel BGrok 4.5xAI75.5/1002 independent benchmarks$0.62 per solved task
Shared results
96
GLM 5.3 Flash only
6
Grok 4.5 only
24
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 4.5 75.5 from 2 benchmarks.
Widest category
Coding, 11.1 points apart on average over 21 shared benchmarks.
Widest single gap
LiveBench browser: GLM 5.3 Flash 84.0% against Grok 4.5 44.0%, 40.0 points apart on a 0 to 100 scale.
Output price
GLM 5.3 Flash $0.50 against Grok 4.5 $6.00 per million output tokens, 12.0x apart.
Context window
GLM 5.3 Flash takes 1.05M tokens, Grok 4.5 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 4.5Ties
Coding9111 tie
Intelligence11
Agentic work721 tie
Reasoning86
Math24
Knowledge52
Web design63
General243
All shared boards62322 ties
CodingLike-for-likeFour of these boards feed the Vibe Coding Index911
Coding benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
LiveBench coding80.6%94.3%Grok 4.5
LMArena WebDev16071553GLM 5.3 Flash
AA Coding Index71.572.4Grok 4.5
LiveCodeBench (Vals AI)80.5%87.3%Grok 4.5
SWE-bench Verified (Vals AI)92.0%86.6%GLM 5.3 Flash
Terminal-Bench 4 (Vals AI)37.4%8.6%GLM 5.3 Flash
Vibe Code Bench (Vals AI)30.8%69.0%Grok 4.5
Code migration (Vals AI)20.5%36.6%Grok 4.5
ProgramBench (Vals AI)0.0%0.0%Tie
IOI (Vals AI)52.5%40.6%GLM 5.3 Flash
Terminal-Bench 2.1 (Vals AI)62.9%67.8%Grok 4.5
Vibe Code Bench 1-100 (Vals AI)16.0%Not measuredOnly GLM 5.3 Flash measured
SkillsBench (Vals AI)40.2%66.0%Grok 4.5
CyberBench (Vals AI)67.9%71.0%Grok 4.5
SciCode51.6%55.0%Grok 4.5
FrontierCode31.8%42.4%Grok 4.5
FrontierSWE18.1%Not measuredOnly GLM 5.3 Flash measured
WeirdMLNot measured46.4%Only Grok 4.5 measured
ALE-Bench303.61309.3Grok 4.5
LMArena Text: coding15071474GLM 5.3 Flash
LMArena Text: software and IT15001471GLM 5.3 Flash
LMArena WebDev: React16241556GLM 5.3 Flash
LMArena WebDev: HTML15771567GLM 5.3 Flash
LMArena WebDev: from an image15781562GLM 5.3 Flash
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
AA Intelligence Index41.838.8GLM 5.3 Flash
Epoch Capabilities Index153.1154.1Grok 4.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index72
Agentic work benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
AA Agentic Index50.941.2GLM 5.3 Flash
Design Arena: agents building web appsNot measured1217Only Grok 4.5 measured
Design Arena: agents building full-stack appsNot measured1249Only Grok 4.5 measured
Design Arena: agents building mobile appsNot measured1221Only Grok 4.5 measured
Design Arena: agents building Android appsNot measured1242Only Grok 4.5 measured
Design Arena: agents building Godot gamesNot measured1229Only Grok 4.5 measured
Design Arena: agents building gamesNot measured1235Only Grok 4.5 measured
Design Arena: HTML slidesNot measured1204Only Grok 4.5 measured
Design Arena: PowerPoint slidesNot measured1232Only Grok 4.5 measured
LiveBench research70.1%85.9%Grok 4.5
LiveBench browser84.0%44.0%GLM 5.3 Flash
LiveBench long agentic28.4%27.9%GLM 5.3 Flash
SREBench (Vals AI)0.8%0.8%Tie
Finance Agent (Vals AI)57.9%48.4%GLM 5.3 Flash
Tax Agent Bench (Vals AI)31.6%24.9%GLM 5.3 Flash
Legal Research Bench (Vals AI)45.2%38.0%GLM 5.3 Flash
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly GLM 5.3 Flash measured
Excel Modeling Benchmark (Vals AI)55.9%52.9%GLM 5.3 Flash
Terminal-Bench-Science (Vals AI)2.9%Not measuredOnly GLM 5.3 Flash measured
Time Horizon Index (Vals AI)Not measured6.3%Only Grok 4.5 measured
APEX-Agents52.8%56.2%Grok 4.5
PostTrainBenchNot measured23.4%Only Grok 4.5 measured
Vending-Bench 2Not measured$3,887Only Grok 4.5 measured
LMArena SearchNot measured1216Only Grok 4.5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index86
Reasoning benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
GPQA Diamond86.4%92.9%Grok 4.5
LiveBench reasoning77.6%87.2%Grok 4.5
MMMU Pro (Vals AI)86.0%61.8%GLM 5.3 Flash
GPQA Diamond (Artificial Analysis run)91.2%93.1%Grok 4.5
Humanity's Last Exam (Artificial Analysis run)39.9%42.7%Grok 4.5
GPQA Diamond (Epoch AI run)90.2%93.4%Grok 4.5
ARC-AGI91.0%87.2%GLM 5.3 Flash
ARC-AGI-265.8%52.6%GLM 5.3 Flash
SimpleBenchNot measured70.0%Only Grok 4.5 measured
Chess puzzles21.0%35.0%Grok 4.5
Mystery game puzzles8.0%Not measuredOnly GLM 5.3 Flash measured
LMArena Text: hard prompts14901462GLM 5.3 Flash
LMArena Text: expert15111465GLM 5.3 Flash
LMArena Text: hard prompts in English14881464GLM 5.3 Flash
LMArena Vision: diagrams13171304GLM 5.3 Flash
LMArena Vision: homework13181295GLM 5.3 Flash
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
OTIS Mock AIME93.9%97.8%Grok 4.5
FrontierMath, tiers 1 to 355.8%57.2%Grok 4.5
FrontierMath, tier 417.1%24.4%Grok 4.5
ProofBench21.0%31.0%Grok 4.5
LMArena Text: math15031460GLM 5.3 Flash
LMArena Text: mathematical work14971482GLM 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 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
MMLU Pro86.1%89.2%Grok 4.5
LegalBench (Vals AI)83.9%86.0%Grok 4.5
CorpFin (Vals AI)Not measured67.4%Only Grok 4.5 measured
TaxEval (Vals AI)75.6%71.7%GLM 5.3 Flash
MortgageTax (Vals AI)Not measured61.8%Only Grok 4.5 measured
MedCode (Vals AI)Not measured43.3%Only Grok 4.5 measured
SimpleQA VerifiedNot measured48.3%Only Grok 4.5 measured
LMArena Text: science14841464GLM 5.3 Flash
LMArena Text: medicine and healthcare14751440GLM 5.3 Flash
LMArena Text: legal and government14731463GLM 5.3 Flash
LMArena Text: business and finance14601441GLM 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 index63
Web design benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
Design Arena: websites12721281Grok 4.5
Design Arena: UI components13161279GLM 5.3 Flash
Design Arena: game dev12791263GLM 5.3 Flash
Design Arena: data viz12621267Grok 4.5
Design Arena: 3D13161257GLM 5.3 Flash
Design Arena: all code categories12821276GLM 5.3 Flash
Design Arena: SVG12841215GLM 5.3 Flash
Design Arena: ASCII art12691257GLM 5.3 Flash
LiveBench design77.2%78.1%Grok 4.5
GeneralLike-for-likePublic boards, shown as published, kept out of the index243
General benchmarks for GLM 5.3 Flash and Grok 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
Vals Index50.9%Not measuredOnly GLM 5.3 Flash measured
LiveBench data analysis76.4%73.0%GLM 5.3 Flash
SAGE (Vals AI)Not measured35.0%Only Grok 4.5 measured
MedScribe (Vals AI)88.9%86.9%GLM 5.3 Flash
Vals Multimodal IndexNot measured63.4%Only Grok 4.5 measured
Long context reasoning (AA-LCR)80.0%79.3%GLM 5.3 Flash
DTBenchNot measured96.5%Only Grok 4.5 measured
LMCANot measured45.2%Only Grok 4.5 measured
Surface Evolver Bench52.5%74.4%Grok 4.5
Furniture assemblyNot measured22.5%Only Grok 4.5 measured
LMArena Text14711448GLM 5.3 Flash
LMArena Text: instruction following14781445GLM 5.3 Flash
LMArena Text: creative writing14411442Grok 4.5
LMArena Vision12941287GLM 5.3 Flash
LMArena Text: English14741453GLM 5.3 Flash
LMArena Text: non-English14621440GLM 5.3 Flash
LMArena Text: Chinese15311495GLM 5.3 Flash
LMArena Text: German14621448GLM 5.3 Flash
LMArena Text: Japanese14441430GLM 5.3 Flash
LMArena Text: Korean14361406GLM 5.3 Flash
LMArena Text: French14911457GLM 5.3 Flash
LMArena Text: Spanish14751451GLM 5.3 Flash
LMArena Text: Russian14651449GLM 5.3 Flash
LMArena Text: Polish14501432GLM 5.3 Flash
LMArena Text: multi-turn14691456GLM 5.3 Flash
LMArena Text: longer queries14811462GLM 5.3 Flash
LMArena Text: writing and language14551445GLM 5.3 Flash
LMArena Text: entertainment and media14401434GLM 5.3 Flash
LMArena Vision: English12951285GLM 5.3 Flash
LMArena Vision: Chinese13631345GLM 5.3 Flash
LMArena Vision: reading text12991293GLM 5.3 Flash
LMArena Vision: humor12791276GLM 5.3 Flash
LMArena Vision: creative writing12701293Grok 4.5
LMArena DocumentNot measured1452Only Grok 4.5 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 4.5
BenchmarkGLM 5.3 FlashGrok 4.5Leader
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 4.5$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 4.5$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 4.5$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 4.5
SpecificationZ.ai GLM 5.3 FlashSpaceXAI Grok 4.5
MakerZ.aixAI
WeightsOpen weightsNo public weights listed
ReleasedAugust 26, 2026July 8, 2026
Context window1.05M500K
Input $/Mtok$0.15$2.00
Output $/Mtok$0.50$6.00
Coding index71.075.5
Independent measurements behind it22
Cost per solved task$0.02$0.62
SourceOpenRouter listingOpenRouter listing

Questions

Is GLM 5.3 Flash better than Grok 4.5 for coding?

Pick Grok 4.5 for coding: it scores 75.5 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 $0.62.

Which is cheaper, GLM 5.3 Flash or Grok 4.5?

GLM 5.3 Flash costs $0.15 per million input tokens and $0.50 per million output tokens; Grok 4.5 costs $2.00 and $6.00. Per solved SWE-bench Verified task, GLM 5.3 Flash costs $0.02 and Grok 4.5 $0.62.

Which has the bigger context window, GLM 5.3 Flash or Grok 4.5?

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

How many benchmarks is the GLM 5.3 Flash vs Grok 4.5 comparison based on?

96 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 4.5's on 2. 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/glm-5-3-flash-vs-grok-4-5">LLMBenchmark.ai, GLM 5.3 Flash vs Grok 4.5</a></p>