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Claude Fable 5 vs Claude Opus 4.6

Claude Fable 5 leads Claude Opus 4.6 on coding, 79.3 to 57.2 on the Vibe Coding Index, and Claude Opus 4.6 costs 2.0x less per output token ($25.00 vs $50.00 per million). Updated October 22, 2026; 97 benchmarks have a result for both.

Replace Claude Fable 5 Replace Claude Opus 4.6
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
68
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
29
vs boards won of 97 shared

Claude Fable 5 or Claude Opus 4.6: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.2 for Claude Opus 4.6.

Pick Claude Opus 4.6 for output tokens 2.0x cheaper ($25.00 vs $50.00 per million) and a lower cost per solved task ($1.56 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved task
Shared results
97
Claude Fable 5 only
30
Claude Opus 4.6 only
13
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, Claude Opus 4.6 57.2 from 4 benchmarks.
Widest category
Math, 22.8 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Fable 5 90.2% against Claude Opus 4.6 26.8%, 63.4 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Claude Opus 4.6 $25.00 per million output tokens, 2.0x apart.
Context window
Both take 1M tokens.

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 5BarsClaude Opus 4.6Ties
Coding112
Intelligence20
Agentic work81
Reasoning134
Math42
Knowledge74
Web design80
General1516
All shared boards6829
CodingLike-for-likeSix of these boards feed the Vibe Coding Index112
Coding benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
SWE-bench VerifiedNot measured75.6%Only Claude Opus 4.6 measured
SWE-bench MultilingualNot measured72.0%Only Claude Opus 4.6 measured
LiveBench coding98.3%Not measuredOnly Claude Fable 5 measured
LMArena WebDev16241547Claude Fable 5
AA Coding Index76.5Not measuredOnly Claude Fable 5 measured
LiveCodeBench (Vals AI)89.8%84.7%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%78.2%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%57.6%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
SciCode61.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench Hard (Artificial Analysis run)62.9%48.5%Claude Fable 5
Terminal-BenchNot measured79.8%Only Claude Opus 4.6 measured
FrontierCode53.5%26.6%Claude Fable 5
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%41.2%Claude Fable 5
WeirdML91.9%78.0%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
CybenchNot measured93.0%Only Claude Opus 4.6 measured
ALE-Bench2041.3Not measuredOnly Claude Fable 5 measured
LMArena Text: coding15181534Claude Opus 4.6
LMArena Text: software and IT15131527Claude Opus 4.6
LMArena WebDev: React16311539Claude Fable 5
LMArena WebDev: HTML16511559Claude Fable 5
LMArena WebDev: from an image16231543Claude Fable 5
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 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
AA Intelligence Index49.631.9Claude Fable 5
Epoch Capabilities Index163.4155.7Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index81
Agentic work benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps12611206Claude Fable 5
Design Arena: agents building full-stack apps12801220Claude Fable 5
Design Arena: agents building mobile apps12641207Claude Fable 5
Design Arena: agents building Android apps12841197Claude Fable 5
Design Arena: agents building Godot games1292Not measuredOnly Claude Fable 5 measured
Design Arena: agents building games12851212Claude Fable 5
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%92.1%Claude Fable 5
APEX-Agents63.6%46.3%Claude Fable 5
METR time horizonsNot measured78.9%Only Claude Opus 4.6 measured
Remote Labor Index16.1%4.2%Claude Fable 5
DeepResearch BenchNot measured55.3%Only Claude Opus 4.6 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
Vending-Bench 2$5,680$8,018Claude Opus 4.6
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index134
Reasoning benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
GPQA Diamond93.2%89.7%Claude Fable 5
LiveBench reasoning89.7%Not measuredOnly Claude Fable 5 measured
MMMU Pro (Vals AI)89.3%83.9%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%89.6%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%39.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%90.5%Claude Opus 4.6
ARC-AGI98.5%94.0%Claude Fable 5
ARC-AGI-289.2%69.2%Claude Fable 5
SimpleBench81.9%67.6%Claude Fable 5
Chess puzzles47.0%21.0%Claude Fable 5
Mystery game puzzles52.0%25.0%Claude Fable 5
EBR-bench39.5%12.7%Claude Fable 5
LMArena Text: hard prompts15071525Claude Opus 4.6
LMArena Text: expert15341544Claude Opus 4.6
LMArena Text: hard prompts in English15091530Claude Opus 4.6
LMArena Vision: diagrams13571340Claude Fable 5
LMArena Vision: homework13611337Claude Fable 5
Kagi LLM Benchmark91.4%83.6%Claude Fable 5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
AIMENot measured95.6%Only Claude Opus 4.6 measured
OTIS Mock AIME100.0%94.4%Claude Fable 5
FrontierMath, tiers 1 to 387.0%66.0%Claude Fable 5
FrontierMath, tier 490.2%26.8%Claude Fable 5
ProofBench95.0%50.0%Claude Fable 5
LMArena Text: math15161518Claude Opus 4.6
LMArena Text: mathematical work15151525Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index74
Knowledge benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
MMLU Pro91.5%89.1%Claude Fable 5
LegalBench (Vals AI)88.6%85.3%Claude Fable 5
CaseLaw (Vals AI)Not measured62.1%Only Claude Opus 4.6 measured
CorpFin (Vals AI)71.8%67.0%Claude Fable 5
TaxEval (Vals AI)76.9%76.0%Claude Fable 5
MortgageTax (Vals AI)68.9%68.5%Claude Fable 5
MedQA (Vals AI)Not measured95.4%Only Claude Opus 4.6 measured
MedCode (Vals AI)56.1%49.1%Claude Fable 5
SimpleQA Verified70.7%47.0%Claude Fable 5
LMArena Text: science15061519Claude Opus 4.6
LMArena Text: medicine and healthcare14801504Claude Opus 4.6
LMArena Text: legal and government14981512Claude Opus 4.6
LMArena Text: business and finance14801497Claude Opus 4.6
FACTS Benchmark SuiteNot measured41.5%Only Claude Opus 4.6 measured
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
Design Arena: websites12951291Claude Fable 5
Design Arena: UI components13161281Claude Fable 5
Design Arena: game dev13351277Claude Fable 5
Design Arena: data viz13041279Claude Fable 5
Design Arena: 3D13181273Claude Fable 5
Design Arena: all code categories13101288Claude Fable 5
Design Arena: SVG13021227Claude Fable 5
Design Arena: ASCII art13291255Claude Fable 5
LiveBench design84.7%Not measuredOnly Claude Fable 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1516
General benchmarks for Claude Fable 5 and Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
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%51.6%Claude Fable 5
MedScribe (Vals AI)88.5%86.7%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%53.1%Claude Fable 5
Long context reasoning (AA-LCR)82.3%78.0%Claude Fable 5
DTBench98.4%91.2%Claude Fable 5
LMCA61.2%55.8%Claude Fable 5
CL-benchNot measured20.7%Only Claude Opus 4.6 measured
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%28.3%Claude Fable 5
CL-bench LifeNot measured17.0%Only Claude Opus 4.6 measured
LMArena Text14911501Claude Opus 4.6
LMArena Text: instruction following15021521Claude Opus 4.6
LMArena Text: creative writing14941505Claude Opus 4.6
LMArena Vision13251316Claude Fable 5
LMArena Text: English14981511Claude Opus 4.6
LMArena Text: non-English14821488Claude Opus 4.6
LMArena Text: Chinese15431551Claude Opus 4.6
LMArena Text: German14861500Claude Opus 4.6
LMArena Text: Japanese15041488Claude Fable 5
LMArena Text: Korean14871464Claude Fable 5
LMArena Text: French15051512Claude Opus 4.6
LMArena Text: Spanish14981510Claude Opus 4.6
LMArena Text: Russian15031497Claude Fable 5
LMArena Text: Polish14941499Claude Opus 4.6
LMArena Text: multi-turn15041511Claude Opus 4.6
LMArena Text: longer queries15101518Claude Opus 4.6
LMArena Text: writing and language15011502Claude Opus 4.6
LMArena Text: entertainment and media14821492Claude Opus 4.6
LMArena Vision: English13231324Claude Opus 4.6
LMArena Vision: Chinese13731370Claude Fable 5
LMArena Vision: reading text13371326Claude Fable 5
LMArena Vision: humor13411314Claude Fable 5
LMArena Vision: recognizing thingsNot measured1274Only Claude Opus 4.6 measured
LMArena Vision: creative writing13381331Claude Fable 5
LMArena Document14961507Claude Opus 4.6
Neither model has a result on the other 8 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 Claude Opus 4.6
BenchmarkClaude Fable 5Claude Opus 4.6Leader
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
Claude Opus 4.6$0.018Fits in one request

Claude Opus 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Claude Opus 4.6$0.325Fits in one request

Claude Opus 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Claude Opus 4.6$1.25Fits in one request

Claude Opus 4.6 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 Claude Opus 4.6
SpecificationAnthropic Claude Fable 5Anthropic Claude Opus 4.6
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026February 4, 2026
Context window1M1M
Input $/Mtok$10.00$5.00
Output $/Mtok$50.00$25.00
Coding index79.357.2
Independent measurements behind it64
Cost per solved task$2.16$1.56
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Claude Opus 4.6 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.2 for Claude Opus 4.6. Pick Claude Opus 4.6 for output tokens 2.0x cheaper ($25.00 vs $50.00 per million) and a lower cost per solved task ($1.56 against $2.16).

Which is cheaper, Claude Fable 5 or Claude Opus 4.6?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Opus 4.6 costs $5.00 and $25.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Claude Opus 4.6 $1.56.

Which has the bigger context window, Claude Fable 5 or Claude Opus 4.6?

Neither: both take 1M tokens.

How many benchmarks is the Claude Fable 5 vs Claude Opus 4.6 comparison based on?

97 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Claude Opus 4.6's on 4. 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/claude-fable-5-vs-claude-opus-4-6">LLMBenchmark.ai, Claude Fable 5 vs Claude Opus 4.6</a></p>