Enter opens the highlighted result. Esc closes.

Claude Fable 5 vs GLM 5.3

Updated October 21, 2026. 92 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Fable 5 Replace GLM 5.3
Claude Fable 5Anthropic
Coding
82.1
Overall
49.6
Output $/M
$50.00
82
GLM 5.3Z.ai
Coding
73.1
Overall
44.8
Output $/M
$1.40
10
vs boards won of 92 shared

Decision reading

Pick Claude Fable 5 for coding: it scores 82.1 on the Vibe Coding Index against 73.1 for GLM 5.3.

Pick GLM 5.3 when output tokens cost 35.7x less, or when a solved task costs $0.36 against $2.16.

Model AClaude Fable 5Anthropic82.1/1002 independent benchmarks$2.16 per solved taskModel BGLM 5.3Z.ai73.1/1002 independent benchmarks$0.36 per solved task
Shared results
92
Claude Fable 5 only
34
GLM 5.3 only
8
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
Claude Fable 5 82.1 from 2 benchmarks, GLM 5.3 73.1 from 2 benchmarks.
Widest category
Math, 23.4 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5 92.0% against GLM 5.3 0.0%, 92.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against GLM 5.3 $1.40 per million output tokens, 35.7x apart.
Context window
Claude Fable 5 takes 1M tokens, GLM 5.3 1.05M.

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
CategoryClaude Fable 5BarsGLM 5.3Ties
Coding172
Intelligence20
Agentic work113
Reasoning91
Math60
Knowledge81
Web design81
General212
All shared boards8210
CodingLike-for-likeFour of these boards feed the Vibe Coding Index172
Coding benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
LiveBench coding98.3%82.8%Claude Fable 5
LMArena WebDev16241621Claude Fable 5
AA Coding Index76.574.8Claude Fable 5
LiveCodeBench (Vals AI)89.8%80.5%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%95.4%GLM 5.3
Terminal-Bench 4 (Vals AI)41.4%38.9%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%78.1%Claude Fable 5
Code migration (Vals AI)55.1%44.2%Claude Fable 5
ProgramBench (Vals AI)2.0%1.5%Claude Fable 5
IOI (Vals AI)Not measured68.4%Only GLM 5.3 measured
Terminal-Bench 2.1 (Vals AI)80.5%71.5%Claude Fable 5
Vibe Code Bench 1-100 (Vals AI)Not measured20.0%Only GLM 5.3 measured
SkillsBench (Vals AI)Not measured47.5%Only GLM 5.3 measured
CyberBench (Vals AI)Not measured72.1%Only GLM 5.3 measured
SciCode61.0%59.0%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%40.1%Claude Fable 5
FrontierSWE47.0%30.2%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%75.4%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.31317.4Claude Fable 5
LMArena Text: coding15181497Claude Fable 5
LMArena Text: software and IT15131493Claude Fable 5
LMArena WebDev: React16311641GLM 5.3
LMArena WebDev: HTML16511595Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
AA Intelligence Index49.644.8Claude Fable 5
Epoch Capabilities Index163.4156.0Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index113
Agentic work benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
AA Agentic Index50.753.1GLM 5.3
Design Arena: agents building web apps1261Not measuredOnly Claude Fable 5 measured
Design Arena: agents building full-stack apps1280Not measuredOnly Claude Fable 5 measured
Design Arena: agents building mobile apps12641194Claude Fable 5
Design Arena: agents building Android apps1289Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games1285Not measuredOnly Claude Fable 5 measured
Design Arena: HTML slides12771189Claude Fable 5
Design Arena: PowerPoint slides12951255Claude Fable 5
LiveBench research86.9%73.2%Claude Fable 5
LiveBench browser92.0%0.0%Claude Fable 5
LiveBench long agentic53.2%35.9%Claude Fable 5
SREBench (Vals AI)Not measured9.2%Only GLM 5.3 measured
Finance Agent (Vals AI)56.3%55.8%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%39.7%GLM 5.3
Legal Research Bench (Vals AI)49.5%49.0%Claude Fable 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured14.6%Only GLM 5.3 measured
Excel Modeling Benchmark (Vals AI)73.7%56.3%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%5.7%Claude Fable 5
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%56.6%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680$8,164GLM 5.3
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index91
Reasoning benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
GPQA Diamond93.2%88.1%Claude Fable 5
LiveBench reasoning89.7%85.8%Claude Fable 5
MysteryMechanism (Vals AI)Not measured23.0%Only GLM 5.3 measured
MMMU Pro (Vals AI)89.3%Not measuredOnly Claude Fable 5 measured
GPQA Diamond (Artificial Analysis run)92.6%91.7%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%42.3%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%90.9%GLM 5.3
ARC-AGI98.5%Not measuredOnly Claude Fable 5 measured
ARC-AGI-289.2%Not measuredOnly Claude Fable 5 measured
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%37.0%Claude Fable 5
Mystery game puzzles52.0%33.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071490Claude Fable 5
LMArena Text: expert15341514Claude Fable 5
LMArena Text: hard prompts in English15091496Claude Fable 5
LMArena Vision: diagrams1357Not measuredOnly Claude Fable 5 measured
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
OTIS Mock AIME100.0%91.1%Claude Fable 5
FrontierMath, tiers 1 to 387.0%68.8%Claude Fable 5
FrontierMath, tier 490.2%29.3%Claude Fable 5
ProofBench95.0%49.0%Claude Fable 5
LMArena Text: math15161495Claude Fable 5
LMArena Text: mathematical work15151497Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index81
Knowledge benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
MMLU Pro91.5%86.8%Claude Fable 5
LegalBench (Vals AI)88.6%84.8%Claude Fable 5
CorpFin (Vals AI)71.8%Not measuredOnly Claude Fable 5 measured
TaxEval (Vals AI)76.9%72.4%Claude Fable 5
MortgageTax (Vals AI)68.9%Not measuredOnly Claude Fable 5 measured
MedCode (Vals AI)56.1%42.9%Claude Fable 5
SimpleQA Verified70.7%41.0%Claude Fable 5
LMArena Text: science15061498Claude Fable 5
LMArena Text: medicine and healthcare14801481GLM 5.3
LMArena Text: legal and government14981473Claude Fable 5
LMArena Text: business and finance14801459Claude Fable 5
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index81
Web design benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
Design Arena: websites12961295Claude Fable 5
Design Arena: UI components13181314Claude Fable 5
Design Arena: game dev13361311Claude Fable 5
Design Arena: data viz13041260Claude Fable 5
Design Arena: 3D13191332GLM 5.3
Design Arena: all code categories13101304Claude Fable 5
Design Arena: SVG13021292Claude Fable 5
Design Arena: ASCII art13281213Claude Fable 5
LiveBench design84.7%77.3%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index212
General benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
Vals IndexNot measured59.7%Only GLM 5.3 measured
LiveBench data analysis80.5%70.2%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%68.5%Claude Fable 5
SAGE (Vals AI)51.9%Not measuredOnly Claude Fable 5 measured
MedScribe (Vals AI)88.5%88.8%GLM 5.3
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%79.7%Claude Fable 5
DTBench98.4%87.7%Claude Fable 5
LMCA61.2%55.5%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
LMArena Text14911474Claude Fable 5
LMArena Text: instruction following15021479Claude Fable 5
LMArena Text: creative writing14941458Claude Fable 5
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981482Claude Fable 5
LMArena Text: non-English14821459Claude Fable 5
LMArena Text: Chinese15431532Claude Fable 5
LMArena Text: German14861488GLM 5.3
LMArena Text: Japanese15041460Claude Fable 5
LMArena Text: Korean14871460Claude Fable 5
LMArena Text: French15051503Claude Fable 5
LMArena Text: Spanish14981462Claude Fable 5
LMArena Text: Russian15031469Claude Fable 5
LMArena Text: Polish14941466Claude Fable 5
LMArena Text: multi-turn15041472Claude Fable 5
LMArena Text: longer queries15101483Claude Fable 5
LMArena Text: writing and language15011469Claude Fable 5
LMArena Text: entertainment and media14821447Claude Fable 5
LMArena Vision: English1323Not measuredOnly Claude Fable 5 measured
LMArena Vision: Chinese1373Not measuredOnly Claude Fable 5 measured
LMArena Vision: reading text1337Not measuredOnly Claude Fable 5 measured
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing1338Not measuredOnly Claude Fable 5 measured
LMArena Document1496Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 10 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Fable 5 and GLM 5.3
BenchmarkClaude Fable 5GLM 5.3Leader
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

Claude Fable 5$0.035Fits in one request
GLM 5.3$0.0008Fits in one request

GLM 5.3 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
GLM 5.3$0.0081Fits in one request

GLM 5.3 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
GLM 5.3$0.030Fits in one request

GLM 5.3 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 Claude Fable 5 and GLM 5.3
SpecificationAnthropic Claude Fable 5Z.ai GLM 5.3
MakerAnthropicZ.ai
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026August 18, 2026
Context window1M1.05M
Input $/Mtok$10.00$0.079
Output $/Mtok$50.00$1.40
Coding index82.173.1
Independent measurements behind it22
Cost per solved task$2.16$0.36
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than GLM 5.3 for coding?

Pick Claude Fable 5 for coding: it scores 82.1 on the Vibe Coding Index against 73.1 for GLM 5.3. Pick GLM 5.3 when output tokens cost 35.7x less, or when a solved task costs $0.36 against $2.16.

Which is cheaper, Claude Fable 5 or GLM 5.3?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GLM 5.3 costs $0.079 and $1.40. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and GLM 5.3 $0.36.

Which has the bigger context window, Claude Fable 5 or GLM 5.3?

GLM 5.3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5 vs GLM 5.3 comparison based on?

92 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5's coding index rests on 2 independent benchmarks and GLM 5.3'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/claude-fable-5-vs-glm-5-3" title="Claude Fable 5 vs GLM 5.3, 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/claude-fable-5-vs-glm-5-3">LLMBenchmark.ai, Claude Fable 5 vs GLM 5.3</a></p>