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Claude Fable 5 vs GLM 5.1

Claude Fable 5 leads GLM 5.1 on coding, 79.3 to 49.2 on the Vibe Coding Index, and GLM 5.1 costs 11.4x less per output token ($4.40 vs $50.00 per million). Updated October 21, 2026; 85 benchmarks have a result for both.

Replace Claude Fable 5 Replace GLM 5.1
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
81
GLM 5.1Z.ai
Coding
49.2
Overall
57.5
Output $/M
$4.40
4
vs boards won of 85 shared

Claude Fable 5 or GLM 5.1: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 49.2 for GLM 5.1.

Pick GLM 5.1 for output tokens 11.4x cheaper ($4.40 vs $50.00 per million) and a lower cost per solved task ($0.60 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGLM 5.1Z.ai49.2/1003 independent benchmarks$0.60 per solved task
Shared results
85
Claude Fable 5 only
42
GLM 5.1 only
4
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 79.3 from 6 benchmarks, GLM 5.1 49.2 from 3 benchmarks.
Widest category
Math, 28.9 points apart on average over 5 shared benchmarks.
Widest single gap
ProofBench: Claude Fable 5 95.0% against GLM 5.1 22.2%, 72.8 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against GLM 5.1 $4.40 per million output tokens, 11.4x apart.
Context window
Claude Fable 5 takes 1M tokens, GLM 5.1 205K.

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 5.1Ties
Coding160
Intelligence20
Agentic work140
Reasoning81
Math50
Knowledge100
Web design62
General201
All shared boards814
CodingLike-for-likeSix of these boards feed the Vibe Coding Index160
Coding benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
LiveBench coding98.3%Not measuredOnly Claude Fable 5 measured
LMArena WebDev16241508Claude Fable 5
AA Coding Index76.555.8Claude Fable 5
LiveCodeBench (Vals AI)89.8%81.4%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%76.4%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%31.5%Claude Fable 5
Code migration (Vals AI)55.1%25.8%Claude Fable 5
ProgramBench (Vals AI)2.0%0.0%Claude Fable 5
Terminal-Bench 2.1 (Vals AI)80.5%56.9%Claude Fable 5
SciCode61.0%44.8%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%43.2%Claude Fable 5
FrontierCode53.5%Not measuredOnly Claude Fable 5 measured
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%57.1%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3887.1Claude Fable 5
LMArena Text: coding15181485Claude Fable 5
LMArena Text: software and IT15131484Claude Fable 5
LMArena WebDev: React16311505Claude Fable 5
LMArena WebDev: HTML16511508Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 16 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
AA Intelligence Index49.626.1Claude Fable 5
Epoch Capabilities Index163.4149.8Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index140
Agentic work benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
AA Agentic Index50.723.9Claude Fable 5
Design Arena: agents building web apps12611175Claude Fable 5
Design Arena: agents building full-stack apps12801167Claude Fable 5
Design Arena: agents building mobile apps12641162Claude Fable 5
Design Arena: agents building Android apps12831180Claude Fable 5
Design Arena: agents building Godot games12921053Claude Fable 5
Design Arena: agents building games12851164Claude Fable 5
Design Arena: HTML slides12771170Claude Fable 5
Design Arena: PowerPoint slides12951188Claude Fable 5
Design Arena: spreadsheetsNot measured1315Only GLM 5.1 measured
LiveBench research86.9%Not measuredOnly Claude Fable 5 measured
LiveBench browser92.0%Not measuredOnly Claude Fable 5 measured
LiveBench long agentic53.2%Not measuredOnly Claude Fable 5 measured
Finance Agent (Vals AI)56.3%44.8%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%Not measuredOnly Claude Fable 5 measured
Legal Research Bench (Vals AI)49.5%27.9%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%Not measuredOnly Claude Fable 5 measured
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%97.7%Claude Fable 5
APEX-Agents63.6%40.9%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$5,634Claude Fable 5
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index81
Reasoning benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
GPQA Diamond93.2%84.5%Claude Fable 5
LiveBench reasoning89.7%Not measuredOnly Claude Fable 5 measured
MMMU Pro (Vals AI)89.3%Not measuredOnly Claude Fable 5 measured
GPQA Diamond (Artificial Analysis run)92.6%86.8%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%30.1%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%89.9%GLM 5.1
ARC-AGI98.5%Not measuredOnly Claude Fable 5 measured
ARC-AGI-289.2%Not measuredOnly Claude Fable 5 measured
SimpleBench81.9%55.1%Claude Fable 5
Chess puzzles47.0%20.0%Claude Fable 5
Mystery game puzzles52.0%Not measuredOnly Claude Fable 5 measured
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071473Claude Fable 5
LMArena Text: expert15341478Claude Fable 5
LMArena Text: hard prompts in English15091482Claude Fable 5
LMArena Vision: diagrams1357Not measuredOnly Claude Fable 5 measured
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
Kagi LLM Benchmark91.4%Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index50
Math benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
AIMENot measured91.9%Only GLM 5.1 measured
OTIS Mock AIME100.0%93.3%Claude Fable 5
FrontierMath, tiers 1 to 387.0%36.8%Claude Fable 5
FrontierMath, tier 490.2%Not measuredOnly Claude Fable 5 measured
ProofBench95.0%22.2%Claude Fable 5
LMArena Text: math15161473Claude Fable 5
LMArena Text: mathematical work15151470Claude Fable 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
MMLU Pro91.5%86.9%Claude Fable 5
LegalBench (Vals AI)88.6%84.4%Claude Fable 5
CaseLaw (Vals AI)Not measured51.5%Only GLM 5.1 measured
CorpFin (Vals AI)71.8%64.5%Claude Fable 5
TaxEval (Vals AI)76.9%71.2%Claude Fable 5
MortgageTax (Vals AI)68.9%Not measuredOnly Claude Fable 5 measured
MedCode (Vals AI)56.1%41.6%Claude Fable 5
SimpleQA Verified70.7%34.0%Claude Fable 5
LMArena Text: science15061478Claude Fable 5
LMArena Text: medicine and healthcare14801474Claude Fable 5
LMArena Text: legal and government14981465Claude Fable 5
LMArena Text: business and finance14801452Claude 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 index62
Web design benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
Design Arena: websites12961290Claude Fable 5
Design Arena: UI components13191292Claude Fable 5
Design Arena: game dev13351265Claude Fable 5
Design Arena: data viz13041366GLM 5.1
Design Arena: 3D13191336GLM 5.1
Design Arena: all code categories13101268Claude Fable 5
Design Arena: SVG13021218Claude Fable 5
Design Arena: ASCII art13291142Claude Fable 5
LiveBench design84.7%Not measuredOnly Claude Fable 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index201
General benchmarks for Claude Fable 5 and GLM 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
LiveBench data analysis80.5%Not measuredOnly Claude Fable 5 measured
Public Benefits Bench (Vals AI)70.4%61.8%Claude Fable 5
SAGE (Vals AI)51.9%Not measuredOnly Claude Fable 5 measured
MedScribe (Vals AI)88.5%72.3%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%76.3%GLM 5.1
Long context reasoning (AA-LCR)82.3%73.7%Claude Fable 5
DTBench98.4%Not measuredOnly Claude Fable 5 measured
LMCA61.2%Not measuredOnly Claude Fable 5 measured
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
ExploitBenchNot measured18.1%Only GLM 5.1 measured
LMArena Text14911463Claude Fable 5
LMArena Text: instruction following15021453Claude Fable 5
LMArena Text: creative writing14941453Claude Fable 5
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981476Claude Fable 5
LMArena Text: non-English14821448Claude Fable 5
LMArena Text: Chinese15431515Claude Fable 5
LMArena Text: German14861467Claude Fable 5
LMArena Text: Japanese15041435Claude Fable 5
LMArena Text: Korean14871424Claude Fable 5
LMArena Text: French15051470Claude Fable 5
LMArena Text: Spanish14981468Claude Fable 5
LMArena Text: Russian15031454Claude Fable 5
LMArena Text: Polish14941449Claude Fable 5
LMArena Text: multi-turn15041473Claude Fable 5
LMArena Text: longer queries15101467Claude Fable 5
LMArena Text: writing and language15011454Claude Fable 5
LMArena Text: entertainment and media14821442Claude 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 5.1
BenchmarkClaude Fable 5GLM 5.1Leader
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 5.1$0.0036Fits in one request

GLM 5.1 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
GLM 5.1$0.083Fits in one request

GLM 5.1 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
GLM 5.1$0.324Exceeds the context window

GLM 5.1 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 5.1
SpecificationAnthropic Claude Fable 5Z.ai GLM 5.1
MakerAnthropicZ.ai
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026April 7, 2026
Context window1M205K
Input $/Mtok$10.00$1.40
Output $/Mtok$50.00$4.40
Coding index79.349.2
Independent measurements behind it63
Cost per solved task$2.16$0.60
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than GLM 5.1 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 49.2 for GLM 5.1. Pick GLM 5.1 for output tokens 11.4x cheaper ($4.40 vs $50.00 per million) and a lower cost per solved task ($0.60 against $2.16).

Which is cheaper, Claude Fable 5 or GLM 5.1?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GLM 5.1 costs $1.40 and $4.40. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and GLM 5.1 $0.60.

Which has the bigger context window, Claude Fable 5 or GLM 5.1?

Claude Fable 5, with 1M tokens against 205K.

How many benchmarks is the Claude Fable 5 vs GLM 5.1 comparison based on?

85 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and GLM 5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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