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Claude Fable 5.1 vs Claude Sonnet 4.6

Claude Fable 5.1 leads Claude Sonnet 4.6 on coding, 84.2 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; 98 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Claude Sonnet 4.6
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
96
Claude Sonnet 4.6Anthropic
Coding
57.3
Overall
60.3
Output $/M
$15.00
2
vs boards won of 98 shared

Claude Fable 5.1 or Claude Sonnet 4.6: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 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 work measured by Vending-Bench 2 or TaxEval (Vals AI), where it leads.

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BClaude Sonnet 4.6Anthropic57.3/1005 independent benchmarks$1.68 per solved task
Shared results
98
Claude Fable 5.1 only
26
Claude Sonnet 4.6 only
20
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, Claude Sonnet 4.6 57.3 from 5 benchmarks.
Widest category
Math, 22.6 points apart on average over 4 shared benchmarks.
Widest single gap
LiveBench long agentic: Claude Fable 5.1 80.8% against Claude Sonnet 4.6 23.1%, 57.7 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $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 5.1BarsClaude Sonnet 4.6Ties
Coding170
Intelligence20
Agentic work131
Reasoning140
Math40
Knowledge81
Web design90
General290
All shared boards962
CodingLike-for-likeSix of these boards feed the Vibe Coding Index170
Coding benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
LiveBench coding97.7%66.6%Claude Fable 5.1
LMArena WebDev17431523Claude Fable 5.1
AA Coding Index81.663.0Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%82.1%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured77.4%Only Claude Sonnet 4.6 measured
Terminal-Bench 4 (Vals AI)58.1%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench (Vals AI)90.3%55.8%Claude Fable 5.1
Code migration (Vals AI)54.6%39.9%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.5%Claude Fable 5.1
IOI (Vals AI)90.8%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 2.1 (Vals AI)85.0%57.3%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%Not measuredOnly Claude Fable 5.1 measured
SkillsBench (Vals AI)61.5%49.0%Claude Fable 5.1
CyberBench (Vals AI)70.4%Not measuredOnly Claude Fable 5.1 measured
SciCode63.1%50.1%Claude Fable 5.1
Terminal-Bench Hard (Artificial Analysis run)Not measured53.0%Only Claude Sonnet 4.6 measured
Terminal-BenchNot measured53.4%Only Claude Sonnet 4.6 measured
FrontierCode50.9%24.3%Claude Fable 5.1
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%66.1%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2Not measuredOnly Claude Fable 5.1 measured
LMArena Text: coding15321503Claude Fable 5.1
LMArena Text: software and IT15301491Claude Fable 5.1
LMArena WebDev: React17921512Claude Fable 5.1
LMArena WebDev: HTML16841527Claude Fable 5.1
LMArena WebDev: from an image17221529Claude Fable 5.1
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
AA Intelligence Index53.430.1Claude Fable 5.1
Epoch Capabilities Index166.5152.8Claude 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 Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
AA Agentic Index57.931.8Claude Fable 5.1
Design Arena: agents building web apps13181190Claude Fable 5.1
Design Arena: agents building full-stack apps13261213Claude Fable 5.1
Design Arena: agents building mobile apps12671212Claude Fable 5.1
Design Arena: agents building Android appsNot measured1197Only Claude Sonnet 4.6 measured
Design Arena: agents building Godot games13271226Claude Fable 5.1
Design Arena: agents building gamesNot measured1177Only Claude Sonnet 4.6 measured
Design Arena: PowerPoint slides1305Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets1380Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%63.6%Claude Fable 5.1
LiveBench browser100.0%68.0%Claude Fable 5.1
LiveBench long agentic80.8%23.1%Claude Fable 5.1
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%51.0%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%25.8%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%38.5%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%60.2%Claude Fable 5.1
Terminal-Bench-Science (Vals AI)40.0%Not measuredOnly Claude Fable 5.1 measured
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
τ²-Bench TelecomNot measured79.5%Only Claude Sonnet 4.6 measured
APEX-Agents68.6%43.0%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
OSWorld 2.0Not measured9.3%Only Claude Sonnet 4.6 measured
DeepResearch BenchNot measured54.9%Only Claude Sonnet 4.6 measured
OSWorldNot measured72.1%Only Claude Sonnet 4.6 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$7,204Claude Sonnet 4.6
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 11 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index140
Reasoning benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
GPQA Diamond93.4%85.6%Claude Fable 5.1
LiveBench reasoning91.7%86.4%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%83.6%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%87.5%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%33.6%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured87.4%Only Claude Sonnet 4.6 measured
ARC-AGI97.5%86.5%Claude Fable 5.1
ARC-AGI-290.0%60.4%Claude Fable 5.1
Chess puzzles48.0%23.0%Claude Fable 5.1
Mystery game puzzles58.0%16.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281485Claude Fable 5.1
LMArena Text: expert15441500Claude Fable 5.1
LMArena Text: hard prompts in English15221493Claude Fable 5.1
LMArena Vision: diagrams13431306Claude Fable 5.1
LMArena Vision: homework13451311Claude Fable 5.1
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index40
Math benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
AIMENot measured92.3%Only Claude Sonnet 4.6 measured
OTIS Mock AIME100.0%85.8%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%Not measuredOnly Claude Fable 5.1 measured
FrontierMath, tier 487.8%Not measuredOnly Claude Fable 5.1 measured
ProofBench100.0%45.0%Claude Fable 5.1
LMArena Text: math15311462Claude Fable 5.1
LMArena Text: mathematical work15411483Claude Fable 5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index81
Knowledge benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
MMLU Pro92.4%87.3%Claude Fable 5.1
LegalBench (Vals AI)88.5%82.1%Claude Fable 5.1
CaseLaw (Vals AI)Not measured64.0%Only Claude Sonnet 4.6 measured
CorpFin (Vals AI)Not measured65.3%Only Claude Sonnet 4.6 measured
TaxEval (Vals AI)76.0%77.1%Claude Sonnet 4.6
MortgageTax (Vals AI)70.8%67.7%Claude Fable 5.1
MedQA (Vals AI)Not measured92.1%Only Claude Sonnet 4.6 measured
MedCode (Vals AI)53.5%Not measuredOnly Claude Fable 5.1 measured
SimpleQA Verified70.8%35.5%Claude Fable 5.1
LMArena Text: science15321474Claude Fable 5.1
LMArena Text: medicine and healthcare15311451Claude Fable 5.1
LMArena Text: legal and government15141470Claude Fable 5.1
LMArena Text: business and finance14931464Claude Fable 5.1
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 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
Design Arena: websites13121284Claude Fable 5.1
Design Arena: UI components13361269Claude Fable 5.1
Design Arena: game dev13811258Claude Fable 5.1
Design Arena: data viz13441278Claude Fable 5.1
Design Arena: 3D13921234Claude Fable 5.1
Design Arena: all code categories13351275Claude Fable 5.1
Design Arena: SVG13001196Claude Fable 5.1
Design Arena: ASCII art13231235Claude Fable 5.1
LiveBench design83.4%71.8%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index290
General benchmarks for Claude Fable 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude Sonnet 4.6Leader
LiveBench data analysis80.3%76.1%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%62.5%Claude Fable 5.1
SAGE (Vals AI)48.5%46.6%Claude Fable 5.1
MedScribe (Vals AI)91.3%Not measuredOnly Claude Fable 5.1 measured
Vals Multimodal IndexNot measured60.6%Only Claude Sonnet 4.6 measured
IFBenchNot measured56.6%Only Claude Sonnet 4.6 measured
Long context reasoning (AA-LCR)85.3%80.0%Claude Fable 5.1
DTBench97.6%89.9%Claude Fable 5.1
LMCA65.5%46.5%Claude Fable 5.1
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
ExploitBenchNot measured23.6%Only Claude Sonnet 4.6 measured
LMArena Text15121458Claude Fable 5.1
LMArena Text: instruction following15181476Claude Fable 5.1
LMArena Text: creative writing15091435Claude Fable 5.1
LMArena Vision13191283Claude Fable 5.1
LMArena Text: English15061472Claude Fable 5.1
LMArena Text: non-English15081440Claude Fable 5.1
LMArena Text: Chinese15841491Claude Fable 5.1
LMArena Text: German14991428Claude Fable 5.1
LMArena Text: Japanese15621420Claude Fable 5.1
LMArena Text: Korean15171410Claude Fable 5.1
LMArena Text: French15231465Claude Fable 5.1
LMArena Text: Spanish15201464Claude Fable 5.1
LMArena Text: Russian15201440Claude Fable 5.1
LMArena Text: Polish15251443Claude Fable 5.1
LMArena Text: multi-turn14931464Claude Fable 5.1
LMArena Text: longer queries15241479Claude Fable 5.1
LMArena Text: writing and language15101444Claude Fable 5.1
LMArena Text: entertainment and media14971431Claude Fable 5.1
LMArena Vision: English13131298Claude Fable 5.1
LMArena Vision: Chinese13911307Claude Fable 5.1
LMArena Vision: reading text13271296Claude Fable 5.1
LMArena Vision: humor13181248Claude Fable 5.1
LMArena Vision: recognizing thingsNot measured1195Only Claude Sonnet 4.6 measured
LMArena Vision: creative writing13301272Claude Fable 5.1
LMArena DocumentNot measured1482Only Claude Sonnet 4.6 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 5.1 and Claude Sonnet 4.6
BenchmarkClaude Fable 5.1Claude 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 5.1$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 5.1$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 5.1$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 5.1 and Claude Sonnet 4.6
SpecificationAnthropic Claude Fable 5.1Anthropic Claude Sonnet 4.6
MakerAnthropicAnthropic
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 1, 2026February 17, 2026
Context window1M1M
Input $/Mtok$10.00$3.00
Output $/Mtok$50.00$15.00
Coding index84.257.3
Independent measurements behind it55
Cost per solved taskNot computable$1.68
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Claude Sonnet 4.6 for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 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 work measured by Vending-Bench 2 or TaxEval (Vals AI), where it leads.

Which is cheaper, Claude Fable 5.1 or Claude Sonnet 4.6?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Claude Sonnet 4.6 costs $3.00 and $15.00. Cost per solved task is known for Claude Sonnet 4.6 only.

Which has the bigger context window, Claude Fable 5.1 or Claude Sonnet 4.6?

Neither: both take 1M tokens.

How many benchmarks is the Claude Fable 5.1 vs Claude Sonnet 4.6 comparison based on?

98 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 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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