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Claude Fable 5.1 vs GLM 5.3

Claude Fable 5.1 leads GLM 5.3 on coding, 84.2 to 70.6 on the Vibe Coding Index, and GLM 5.3 costs 11.4x less per output token ($4.40 vs $50.00 per million). Updated October 22, 2026; 95 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace GLM 5.3
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
93
GLM 5.3Z.ai
Coding
70.6
Overall
67.9
Output $/M
$4.40
2
vs boards won of 95 shared

Claude Fable 5.1 or GLM 5.3: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 70.6 for GLM 5.3, though on 5 benchmarks against 6.

Pick GLM 5.3 for output tokens 11.4x cheaper ($4.40 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BGLM 5.3Z.ai70.6/1006 independent benchmarks$0.36 per solved task
Shared results
95
Claude Fable 5.1 only
29
GLM 5.3 only
5
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
Claude Fable 5.1 84.2 from 5 benchmarks, GLM 5.3 70.6 from 6 benchmarks.
Widest category
Math, 25.5 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5.1 100.0% against GLM 5.3 0.0%, 100.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against GLM 5.3 $4.40 per million output tokens, 11.4x apart.
Context window
Claude Fable 5.1 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 5.1BarsGLM 5.3Ties
Coding211
Intelligence20
Agentic work131
Reasoning100
Math60
Knowledge90
Web design90
General230
All shared boards932
CodingLike-for-likeSix of these boards feed the Vibe Coding Index211
Coding benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
LiveBench coding97.7%82.8%Claude Fable 5.1
LMArena WebDev17431621Claude Fable 5.1
AA Coding Index81.674.8Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%80.5%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured95.4%Only GLM 5.3 measured
Terminal-Bench 4 (Vals AI)58.1%38.9%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%78.1%Claude Fable 5.1
Code migration (Vals AI)54.6%44.2%Claude Fable 5.1
ProgramBench (Vals AI)7.0%1.5%Claude Fable 5.1
IOI (Vals AI)90.8%68.4%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%71.5%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench 1-100 (Vals AI)28.0%20.0%Claude Fable 5.1
SkillsBench (Vals AI)61.5%47.5%Claude Fable 5.1
CyberBench (Vals AI)70.4%72.1%GLM 5.3
SciCode63.1%59.0%Claude Fable 5.1
FrontierCode50.9%40.1%Claude Fable 5.1
FrontierSWE56.3%30.2%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%75.4%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.21317.4Claude Fable 5.1
LMArena Text: coding15321497Claude Fable 5.1
LMArena Text: software and IT15301493Claude Fable 5.1
LMArena WebDev: React17921641Claude Fable 5.1
LMArena WebDev: HTML16841595Claude Fable 5.1
LMArena WebDev: from an image1722Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
AA Intelligence Index53.444.8Claude Fable 5.1
Epoch Capabilities Index166.5156.0Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index131
Agentic work benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
AA Agentic Index57.953.1Claude Fable 5.1
Design Arena: agents building web apps1318Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building full-stack apps1326Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building mobile apps12671194Claude Fable 5.1
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: HTML slidesNot measured1189Only GLM 5.3 measured
Design Arena: PowerPoint slides13051230Claude Fable 5.1
Design Arena: spreadsheets1380Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%73.2%Claude Fable 5.1
LiveBench browser100.0%0.0%Claude Fable 5.1
LiveBench long agentic80.8%35.9%Claude Fable 5.1
SREBench (Vals AI)22.9%9.2%Claude Fable 5.1
Finance Agent (Vals AI)58.9%55.8%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%39.7%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%49.0%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured14.6%Only GLM 5.3 measured
Excel Modeling Benchmark (Vals AI)76.7%56.3%Claude Fable 5.1
Terminal-Bench-Science (Vals AI)40.0%5.7%Claude Fable 5.1
Time Horizon Index (Vals AI)63.3%Not measuredOnly Claude Fable 5.1 measured
CUA-bench (Vals AI)13.2%Not measuredOnly Claude Fable 5.1 measured
Robo-bench (Vals AI)5.8%Not measuredOnly Claude Fable 5.1 measured
APEX-Agents68.6%56.6%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$8,164GLM 5.3
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index100
Reasoning benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
GPQA Diamond93.4%88.1%Claude Fable 5.1
LiveBench reasoning91.7%85.8%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%23.0%Claude Fable 5.1
MMMU Pro (Vals AI)90.6%Not measuredOnly Claude Fable 5.1 measured
GPQA Diamond (Artificial Analysis run)93.7%91.7%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%42.3%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured90.9%Only GLM 5.3 measured
ARC-AGI97.5%Not measuredOnly Claude Fable 5.1 measured
ARC-AGI-290.0%Not measuredOnly Claude Fable 5.1 measured
Chess puzzles48.0%37.0%Claude Fable 5.1
Mystery game puzzles58.0%33.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281490Claude Fable 5.1
LMArena Text: expert15441514Claude Fable 5.1
LMArena Text: hard prompts in English15221496Claude Fable 5.1
LMArena Vision: diagrams1343Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: homework1345Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
OTIS Mock AIME100.0%91.1%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%68.8%Claude Fable 5.1
FrontierMath, tier 487.8%29.3%Claude Fable 5.1
ProofBench100.0%49.0%Claude Fable 5.1
LMArena Text: math15311495Claude Fable 5.1
LMArena Text: mathematical work15411497Claude Fable 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
MMLU Pro92.4%86.8%Claude Fable 5.1
LegalBench (Vals AI)88.5%84.8%Claude Fable 5.1
TaxEval (Vals AI)76.0%72.4%Claude Fable 5.1
MortgageTax (Vals AI)70.8%Not measuredOnly Claude Fable 5.1 measured
MedCode (Vals AI)53.5%42.9%Claude Fable 5.1
SimpleQA Verified70.8%41.0%Claude Fable 5.1
LMArena Text: science15321498Claude Fable 5.1
LMArena Text: medicine and healthcare15311481Claude Fable 5.1
LMArena Text: legal and government15141473Claude Fable 5.1
LMArena Text: business and finance14931459Claude Fable 5.1
Neither model has a result on the other 8 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
Design Arena: websites13121295Claude Fable 5.1
Design Arena: UI components13361314Claude Fable 5.1
Design Arena: game dev13811311Claude Fable 5.1
Design Arena: data viz13441260Claude Fable 5.1
Design Arena: 3D13921332Claude Fable 5.1
Design Arena: all code categories13351304Claude Fable 5.1
Design Arena: SVG13001294Claude Fable 5.1
Design Arena: ASCII art13231208Claude Fable 5.1
LiveBench design83.4%77.3%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index230
General benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 5.3Leader
Vals IndexNot measured59.7%Only GLM 5.3 measured
LiveBench data analysis80.3%70.2%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%68.5%Claude Fable 5.1
SAGE (Vals AI)48.5%Not measuredOnly Claude Fable 5.1 measured
MedScribe (Vals AI)91.3%88.8%Claude Fable 5.1
Long context reasoning (AA-LCR)85.3%79.7%Claude Fable 5.1
DTBench97.6%87.7%Claude Fable 5.1
LMCA65.5%55.5%Claude Fable 5.1
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text15121474Claude Fable 5.1
LMArena Text: instruction following15181479Claude Fable 5.1
LMArena Text: creative writing15091458Claude Fable 5.1
LMArena Vision1319Not measuredOnly Claude Fable 5.1 measured
LMArena Text: English15061482Claude Fable 5.1
LMArena Text: non-English15081459Claude Fable 5.1
LMArena Text: Chinese15841532Claude Fable 5.1
LMArena Text: German14991488Claude Fable 5.1
LMArena Text: Japanese15621460Claude Fable 5.1
LMArena Text: Korean15171460Claude Fable 5.1
LMArena Text: French15231503Claude Fable 5.1
LMArena Text: Spanish15201462Claude Fable 5.1
LMArena Text: Russian15201469Claude Fable 5.1
LMArena Text: Polish15251466Claude Fable 5.1
LMArena Text: multi-turn14931472Claude Fable 5.1
LMArena Text: longer queries15241483Claude Fable 5.1
LMArena Text: writing and language15101469Claude Fable 5.1
LMArena Text: entertainment and media14971447Claude Fable 5.1
LMArena Vision: English1313Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text1327Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing1330Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 14 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Fable 5.1 and GLM 5.3
BenchmarkClaude Fable 5.1GLM 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 5.1$0.035Fits in one request
GLM 5.3$0.0036Fits in one request

GLM 5.3 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
GLM 5.3$0.083Fits in one request

GLM 5.3 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
GLM 5.3$0.324Fits 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 5.1 and GLM 5.3
SpecificationAnthropic Claude Fable 5.1Z.ai GLM 5.3
MakerAnthropicZ.ai
WeightsNo public weights listedOpen weights
ReleasedSeptember 1, 2026August 18, 2026
Context window1M1.05M
Input $/Mtok$10.00$1.40
Output $/Mtok$50.00$4.40
Coding index84.270.6
Independent measurements behind it56
Cost per solved taskNot computable$0.36
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than GLM 5.3 for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 70.6 for GLM 5.3, though on 5 benchmarks against 6. Pick GLM 5.3 for output tokens 11.4x cheaper ($4.40 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5.1 or GLM 5.3?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; GLM 5.3 costs $1.40 and $4.40. Cost per solved task is known for GLM 5.3 only.

Which has the bigger context window, Claude Fable 5.1 or GLM 5.3?

GLM 5.3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs GLM 5.3 comparison based on?

95 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5.1's coding index rests on 5 independent benchmarks and GLM 5.3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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