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Claude Fable 5 vs GPT-5

Claude Fable 5 leads GPT-5 on coding, 79.3 to 38.8 on the Vibe Coding Index, and GPT-5 costs 5.0x less per output token ($10.00 vs $50.00 per million). Updated October 22, 2026; 87 benchmarks have a result for both.

Replace Claude Fable 5 Replace GPT-5
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
85
GPT-5OpenAI
Coding
38.8
Overall
51.5
Output $/M
$10.00
2
vs boards won of 87 shared

Claude Fable 5 or GPT-5: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 38.8 for GPT-5.

Pick GPT-5 for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and a lower cost per solved task ($0.39 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BGPT-5OpenAI38.8/1003 independent benchmarks$0.39 per solved task
Shared results
87
Claude Fable 5 only
40
GPT-5 only
26
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, GPT-5 38.8 from 3 benchmarks.
Widest category
Math, 37.0 points apart on average over 6 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Fable 5 89.2% against GPT-5 9.9%, 79.3 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against GPT-5 $10.00 per million output tokens, 5.0x apart.
Context window
Claude Fable 5 takes 1M tokens, GPT-5 400K.

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 5BarsGPT-5Ties
Coding120
Intelligence20
Agentic work20
Reasoning161
Math60
Knowledge110
Web design80
General281
All shared boards852
CodingLike-for-likeSix of these boards feed the Vibe Coding Index120
Coding benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
Aider polyglotNot measured88.0%Only GPT-5 measured
SWE-bench VerifiedNot measured74.4%Only GPT-5 measured
LiveBench coding98.3%Not measuredOnly Claude Fable 5 measured
LMArena WebDev16241418Claude Fable 5
AA Coding Index76.537.8Claude Fable 5
LiveCodeBench (Vals AI)89.8%85.9%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%69.0%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%20.1%Claude Fable 5
Code migration (Vals AI)55.1%Not measuredOnly Claude Fable 5 measured
ProgramBench (Vals AI)2.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 2.1 (Vals AI)80.5%Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Artificial Analysis run)Not measured84.6%Only GPT-5 measured
SciCode61.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench Hard (Artificial Analysis run)62.9%37.9%Claude Fable 5
Terminal-BenchNot measured49.6%Only GPT-5 measured
FrontierCode53.5%Not measuredOnly Claude Fable 5 measured
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%6.9%Claude Fable 5
WeirdML91.9%60.7%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3807.6Claude Fable 5
LMArena Text: coding15181436Claude Fable 5
LMArena Text: software and IT15131420Claude Fable 5
LMArena WebDev: React1631Not measuredOnly Claude Fable 5 measured
LMArena WebDev: HTML16511427Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 measured
SciCodeNot measured0.0%Only GPT-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 GPT-5
BenchmarkClaude Fable 5GPT-5Leader
AA Intelligence Index49.623.0Claude Fable 5
Epoch Capabilities Index163.4150.0Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index20
Agentic work benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
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 apps1264Not measuredOnly Claude Fable 5 measured
Design Arena: agents building Android apps1284Not 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 slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1270Not measuredOnly Claude Fable 5 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%Not measuredOnly Claude Fable 5 measured
Tax Agent Bench (Vals AI)38.3%Not measuredOnly Claude Fable 5 measured
Legal Research Bench (Vals AI)49.5%Not measuredOnly Claude Fable 5 measured
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%86.5%Claude Fable 5
APEX-Agents63.6%Not measuredOnly Claude Fable 5 measured
METR time horizonsNot measured69.6%Only GPT-5 measured
Remote Labor Index16.1%1.7%Claude Fable 5
GDPvalNot measured34.8%Only GPT-5 measured
BALROGNot measured32.8%Only GPT-5 measured
DeepResearch BenchNot measured49.6%Only GPT-5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680Not measuredOnly Claude Fable 5 measured
LMArena Search1229Not measuredOnly Claude Fable 5 measured
BrowseComp-PlusNot measured80.0%Only GPT-5 measured
Neither model has a result on the other 13 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index161
Reasoning benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
GPQA Diamond93.2%85.6%Claude Fable 5
LiveBench reasoning89.7%Not measuredOnly Claude Fable 5 measured
MMMU Pro (Vals AI)89.3%81.5%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%85.4%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%28.5%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%86.2%GPT-5
ARC-AGI98.5%65.7%Claude Fable 5
ARC-AGI-289.2%9.9%Claude Fable 5
SimpleBench81.9%56.7%Claude Fable 5
Chess puzzles47.0%36.0%Claude Fable 5
Mystery game puzzles52.0%23.0%Claude Fable 5
EBR-bench39.5%12.7%Claude Fable 5
VPCTNot measured66.0%Only GPT-5 measured
LMArena Text: hard prompts15071415Claude Fable 5
LMArena Text: expert15341419Claude Fable 5
LMArena Text: hard prompts in English15091419Claude Fable 5
LMArena Vision: diagrams13571252Claude Fable 5
LMArena Vision: homework13611278Claude Fable 5
Kagi LLM Benchmark91.4%72.7%Claude Fable 5
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 GPT-5
BenchmarkClaude Fable 5GPT-5Leader
AIMENot measured93.4%Only GPT-5 measured
MATH 500 (Vals AI)Not measured96.0%Only GPT-5 measured
MGSM (Vals AI)Not measured92.8%Only GPT-5 measured
AA Math IndexNot measured94.3Only GPT-5 measured
AIME 2025 (Artificial Analysis run)Not measured94.3%Only GPT-5 measured
OTIS Mock AIME100.0%91.4%Claude Fable 5
FrontierMath, tiers 1 to 387.0%55.4%Claude Fable 5
FrontierMath, tier 490.2%22.0%Claude Fable 5
ProofBench95.0%18.0%Claude Fable 5
MATH level 5Not measured98.1%Only GPT-5 measured
LMArena Text: math15161407Claude Fable 5
LMArena Text: mathematical work15151405Claude Fable 5
Neither model has a result on the other 1 board here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
MMLU Pro91.5%86.5%Claude Fable 5
LegalBench (Vals AI)88.6%86.0%Claude Fable 5
CaseLaw (Vals AI)Not measured66.5%Only GPT-5 measured
CorpFin (Vals AI)71.8%61.1%Claude Fable 5
TaxEval (Vals AI)76.9%73.4%Claude Fable 5
MortgageTax (Vals AI)68.9%65.5%Claude Fable 5
MedQA (Vals AI)Not measured96.3%Only GPT-5 measured
MedCode (Vals AI)56.1%49.6%Claude Fable 5
MMLU Pro (Artificial Analysis run)Not measured87.1%Only GPT-5 measured
SimpleQA Verified70.7%50.1%Claude Fable 5
GeoBenchNot measured81.0%Only GPT-5 measured
LMArena Text: science15061416Claude Fable 5
LMArena Text: medicine and healthcare14801413Claude Fable 5
LMArena Text: legal and government14981431Claude Fable 5
LMArena Text: business and finance14801400Claude Fable 5
FACTS Benchmark SuiteNot measured56.5%Only GPT-5 measured
Neither model has a result on the other 2 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
Design Arena: websites12951184Claude Fable 5
Design Arena: UI components13161177Claude Fable 5
Design Arena: game dev13351185Claude Fable 5
Design Arena: data viz13041221Claude Fable 5
Design Arena: 3D13181055Claude Fable 5
Design Arena: all code categories13101167Claude Fable 5
Design Arena: SVG13021188Claude Fable 5
Design Arena: ASCII art13291141Claude Fable 5
LiveBench design84.7%Not measuredOnly Claude Fable 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index281
General benchmarks for Claude Fable 5 and GPT-5
BenchmarkClaude Fable 5GPT-5Leader
LiveBench data analysis80.5%Not measuredOnly Claude Fable 5 measured
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%43.7%Claude Fable 5
MedScribe (Vals AI)88.5%83.7%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%73.1%GPT-5
Long context reasoning (AA-LCR)82.3%78.2%Claude Fable 5
DTBench98.4%90.7%Claude Fable 5
LMCA61.2%40.0%Claude Fable 5
Fiction.LiveBenchNot measured97.2%Only GPT-5 measured
Creative writing (Lech Mazur)Not measured86.0%Only GPT-5 measured
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
LMArena Text14911406Claude Fable 5
LMArena Text: instruction following15021388Claude Fable 5
LMArena Text: creative writing14941365Claude Fable 5
LMArena Vision13251232Claude Fable 5
LMArena Text: English14981409Claude Fable 5
LMArena Text: non-English14821397Claude Fable 5
LMArena Text: Chinese15431422Claude Fable 5
LMArena Text: German14861416Claude Fable 5
LMArena Text: Japanese15041409Claude Fable 5
LMArena Text: Korean14871360Claude Fable 5
LMArena Text: French15051409Claude Fable 5
LMArena Text: Spanish14981399Claude Fable 5
LMArena Text: Russian15031407Claude Fable 5
LMArena Text: Polish14941431Claude Fable 5
LMArena Text: multi-turn15041426Claude Fable 5
LMArena Text: longer queries15101399Claude Fable 5
LMArena Text: writing and language15011384Claude Fable 5
LMArena Text: entertainment and media14821379Claude Fable 5
LMArena Vision: English13231231Claude Fable 5
LMArena Vision: Chinese13731267Claude Fable 5
LMArena Vision: reading text13371246Claude Fable 5
LMArena Vision: humor13411219Claude Fable 5
LMArena Vision: captioningNot measured1212Only GPT-5 measured
LMArena Vision: recognizing thingsNot measured1263Only GPT-5 measured
LMArena Vision: creative writing13381210Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 7 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 GPT-5
BenchmarkClaude Fable 5GPT-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

Claude Fable 5$0.035Fits in one request
GPT-5$0.0063Fits in one request

GPT-5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
GPT-5$0.092Fits in one request

GPT-5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
GPT-5$0.350Fits in one request

GPT-5 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 GPT-5
SpecificationAnthropic Claude Fable 5OpenAI GPT-5
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026August 7, 2025
Context window1M400K
Input $/Mtok$10.00$1.25
Output $/Mtok$50.00$10.00
Coding index79.338.8
Independent measurements behind it63
Cost per solved task$2.16$0.39
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than GPT-5 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 38.8 for GPT-5. Pick GPT-5 for output tokens 5.0x cheaper ($10.00 vs $50.00 per million) and a lower cost per solved task ($0.39 against $2.16).

Which is cheaper, Claude Fable 5 or GPT-5?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-5 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and GPT-5 $0.39.

Which has the bigger context window, Claude Fable 5 or GPT-5?

Claude Fable 5, with 1M tokens against 400K.

How many benchmarks is the Claude Fable 5 vs GPT-5 comparison based on?

87 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and GPT-5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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