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Claude Fable 5 vs Claude Sonnet 4.6

Claude Fable 5 leads Claude Sonnet 4.6 on coding, 79.3 to 57.3 on the Vibe Coding Index, and Claude Sonnet 4.6 costs 3.3x less per output token ($15.00 vs $50.00 per million). Updated October 22, 2026; 107 benchmarks have a result for both.

Replace Claude Fable 5 Replace Claude Sonnet 4.6
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
104
Claude Sonnet 4.6Anthropic
Coding
57.3
Overall
60.3
Output $/M
$15.00
3
vs boards won of 107 shared

Claude Fable 5 or Claude Sonnet 4.6: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.3 for Claude Sonnet 4.6.

Pick Claude Sonnet 4.6 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a lower cost per solved task ($1.68 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BClaude Sonnet 4.6Anthropic57.3/1005 independent benchmarks$1.68 per solved task
Shared results
107
Claude Fable 5 only
20
Claude Sonnet 4.6 only
11
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 Sonnet 4.6 57.3 from 5 benchmarks.
Widest category
Math, 19.7 points apart on average over 4 shared benchmarks.
Widest single gap
ProofBench: Claude Fable 5 95.0% against Claude Sonnet 4.6 45.0%, 50.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Claude Sonnet 4.6 $15.00 per million output tokens, 3.3x 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 Sonnet 4.6Ties
Coding180
Intelligence20
Agentic work161
Reasoning141
Math40
Knowledge91
Web design90
General320
All shared boards1043
CodingLike-for-likeSix of these boards feed the Vibe Coding Index180
Coding benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
LiveBench coding98.3%66.6%Claude Fable 5
LMArena WebDev16241523Claude Fable 5
AA Coding Index76.563.0Claude Fable 5
LiveCodeBench (Vals AI)89.8%82.1%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%77.4%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%55.8%Claude Fable 5
Code migration (Vals AI)55.1%39.9%Claude Fable 5
ProgramBench (Vals AI)2.0%0.5%Claude Fable 5
Terminal-Bench 2.1 (Vals AI)80.5%57.3%Claude Fable 5
SkillsBench (Vals AI)Not measured49.0%Only Claude Sonnet 4.6 measured
SciCode61.0%50.1%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%53.0%Claude Fable 5
Terminal-BenchNot measured53.4%Only Claude Sonnet 4.6 measured
FrontierCode53.5%24.3%Claude Fable 5
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%66.1%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3Not measuredOnly Claude Fable 5 measured
LMArena Text: coding15181503Claude Fable 5
LMArena Text: software and IT15131491Claude Fable 5
LMArena WebDev: React16311512Claude Fable 5
LMArena WebDev: HTML16511527Claude Fable 5
LMArena WebDev: from an image16231529Claude Fable 5
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
AA Intelligence Index49.630.1Claude Fable 5
Epoch Capabilities Index163.4152.8Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index161
Agentic work benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
AA Agentic Index50.731.8Claude Fable 5
Design Arena: agents building web apps12611190Claude Fable 5
Design Arena: agents building full-stack apps12801213Claude Fable 5
Design Arena: agents building mobile apps12641212Claude Fable 5
Design Arena: agents building Android apps12841197Claude Fable 5
Design Arena: agents building Godot games12921226Claude Fable 5
Design Arena: agents building games12851177Claude Fable 5
Design Arena: HTML slides1227Not measuredOnly Claude Fable 5 measured
Design Arena: PowerPoint slides1270Not measuredOnly Claude Fable 5 measured
LiveBench research86.9%63.6%Claude Fable 5
LiveBench browser92.0%68.0%Claude Fable 5
LiveBench long agentic53.2%23.1%Claude Fable 5
Finance Agent (Vals AI)56.3%51.0%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%25.8%Claude Fable 5
Legal Research Bench (Vals AI)49.5%38.5%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%60.2%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%79.5%Claude Fable 5
APEX-Agents63.6%43.0%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
OSWorld 2.0Not measured9.3%Only Claude Sonnet 4.6 measured
DeepResearch BenchNot measured54.9%Only Claude Sonnet 4.6 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
OSWorldNot measured72.1%Only Claude Sonnet 4.6 measured
Vending-Bench 2$5,680$7,204Claude Sonnet 4.6
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index141
Reasoning benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
GPQA Diamond93.2%85.6%Claude Fable 5
LiveBench reasoning89.7%86.4%Claude Fable 5
MMMU Pro (Vals AI)89.3%83.6%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%87.5%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%33.6%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%87.4%Claude Sonnet 4.6
ARC-AGI98.5%86.5%Claude Fable 5
ARC-AGI-289.2%60.4%Claude Fable 5
SimpleBench81.9%Not measuredOnly Claude Fable 5 measured
Chess puzzles47.0%23.0%Claude Fable 5
Mystery game puzzles52.0%16.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071485Claude Fable 5
LMArena Text: expert15341500Claude Fable 5
LMArena Text: hard prompts in English15091493Claude Fable 5
LMArena Vision: diagrams13571306Claude Fable 5
LMArena Vision: homework13611311Claude Fable 5
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 index40
Math benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
AIMENot measured92.3%Only Claude Sonnet 4.6 measured
OTIS Mock AIME100.0%85.8%Claude Fable 5
FrontierMath, tiers 1 to 387.0%Not measuredOnly Claude Fable 5 measured
FrontierMath, tier 490.2%Not measuredOnly Claude Fable 5 measured
ProofBench95.0%45.0%Claude Fable 5
LMArena Text: math15161462Claude Fable 5
LMArena Text: mathematical work15151483Claude Fable 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index91
Knowledge benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
MMLU Pro91.5%87.3%Claude Fable 5
LegalBench (Vals AI)88.6%82.1%Claude Fable 5
CaseLaw (Vals AI)Not measured64.0%Only Claude Sonnet 4.6 measured
CorpFin (Vals AI)71.8%65.3%Claude Fable 5
TaxEval (Vals AI)76.9%77.1%Claude Sonnet 4.6
MortgageTax (Vals AI)68.9%67.7%Claude Fable 5
MedQA (Vals AI)Not measured92.1%Only Claude Sonnet 4.6 measured
MedCode (Vals AI)56.1%Not measuredOnly Claude Fable 5 measured
SimpleQA Verified70.7%35.5%Claude Fable 5
LMArena Text: science15061474Claude Fable 5
LMArena Text: medicine and healthcare14801451Claude Fable 5
LMArena Text: legal and government14981470Claude Fable 5
LMArena Text: business and finance14801464Claude Fable 5
FACTS Benchmark SuiteNot measured37.0%Only Claude Sonnet 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 index90
Web design benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
Design Arena: websites12951284Claude Fable 5
Design Arena: UI components13161269Claude Fable 5
Design Arena: game dev13351258Claude Fable 5
Design Arena: data viz13041278Claude Fable 5
Design Arena: 3D13181234Claude Fable 5
Design Arena: all code categories13101275Claude Fable 5
Design Arena: SVG13021196Claude Fable 5
Design Arena: ASCII art13291235Claude Fable 5
LiveBench design84.7%71.8%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index320
General benchmarks for Claude Fable 5 and Claude Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 4.6Leader
LiveBench data analysis80.5%76.1%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%62.5%Claude Fable 5
SAGE (Vals AI)51.9%46.6%Claude Fable 5
MedScribe (Vals AI)88.5%Not measuredOnly Claude Fable 5 measured
Vals Multimodal Index74.2%60.6%Claude Fable 5
IFBench63.5%56.6%Claude Fable 5
Long context reasoning (AA-LCR)82.3%80.0%Claude Fable 5
DTBench98.4%89.9%Claude Fable 5
LMCA61.2%46.5%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
ExploitBenchNot measured23.6%Only Claude Sonnet 4.6 measured
LMArena Text14911458Claude Fable 5
LMArena Text: instruction following15021476Claude Fable 5
LMArena Text: creative writing14941435Claude Fable 5
LMArena Vision13251283Claude Fable 5
LMArena Text: English14981472Claude Fable 5
LMArena Text: non-English14821440Claude Fable 5
LMArena Text: Chinese15431491Claude Fable 5
LMArena Text: German14861428Claude Fable 5
LMArena Text: Japanese15041420Claude Fable 5
LMArena Text: Korean14871410Claude Fable 5
LMArena Text: French15051465Claude Fable 5
LMArena Text: Spanish14981464Claude Fable 5
LMArena Text: Russian15031440Claude Fable 5
LMArena Text: Polish14941443Claude Fable 5
LMArena Text: multi-turn15041464Claude Fable 5
LMArena Text: longer queries15101479Claude Fable 5
LMArena Text: writing and language15011444Claude Fable 5
LMArena Text: entertainment and media14821431Claude Fable 5
LMArena Vision: English13231298Claude Fable 5
LMArena Vision: Chinese13731307Claude Fable 5
LMArena Vision: reading text13371296Claude Fable 5
LMArena Vision: humor13411248Claude Fable 5
LMArena Vision: recognizing thingsNot measured1195Only Claude Sonnet 4.6 measured
LMArena Vision: creative writing13381272Claude Fable 5
LMArena Document14961482Claude Fable 5
Neither model has a result on the other 9 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 Sonnet 4.6
BenchmarkClaude Fable 5Claude Sonnet 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 Sonnet 4.6$0.011Fits in one request

Claude Sonnet 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Claude Sonnet 4.6$0.195Fits in one request

Claude Sonnet 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Claude Sonnet 4.6$0.750Fits in one request

Claude Sonnet 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 Sonnet 4.6
SpecificationAnthropic Claude Fable 5Anthropic Claude Sonnet 4.6
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedJune 9, 2026February 17, 2026
Context window1M1M
Input $/Mtok$10.00$3.00
Output $/Mtok$50.00$15.00
Coding index79.357.3
Independent measurements behind it65
Cost per solved task$2.16$1.68
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 57.3 for Claude Sonnet 4.6. Pick Claude Sonnet 4.6 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a lower cost per solved task ($1.68 against $2.16).

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

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Sonnet 4.6 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Claude Sonnet 4.6 $1.68.

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

Neither: both take 1M tokens.

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

107 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 Sonnet 4.6's on 5. 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-sonnet-4-6">LLMBenchmark.ai, Claude Fable 5 vs Claude Sonnet 4.6</a></p>