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Claude Fable 5.1 vs Inkling

Claude Fable 5.1 leads Inkling on coding, 84.2 to 31.5 on the Vibe Coding Index, and Inkling costs 12.3x less per output token ($4.05 vs $50.00 per million). Updated October 22, 2026; 95 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Inkling
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
95
T InklingThinking Machines
Coding
31.5
Overall
46.5
Output $/M
$4.05
0
vs boards won of 95 shared

Claude Fable 5.1 or Inkling: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 31.5 for Inkling, though on 5 benchmarks against 6.

Pick Inkling for output tokens 12.3x cheaper ($4.05 vs $50.00 per million).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BInklingThinking Machines31.5/1006 independent benchmarks$0.76 per solved task
Shared results
95
Claude Fable 5.1 only
29
Inkling only
7
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, Inkling 31.5 from 6 benchmarks.
Widest category
Math, 45.5 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Fable 5.1 100.0% against Inkling 0.0%, 100.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Inkling $4.05 per million output tokens, 12.3x apart.
Context window
Claude Fable 5.1 takes 1M tokens, Inkling 524K.

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 5.1BarsInklingTies
Coding220
Intelligence20
Agentic work110
Reasoning110
Math60
Knowledge100
Web design90
General240
All shared boards950
CodingLike-for-likeSix of these boards feed the Vibe Coding Index220
Coding benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
LiveBench coding97.7%64.0%Claude Fable 5.1
LMArena WebDev17431414Claude Fable 5.1
AA Coding Index81.652.1Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%85.5%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured77.6%Only Inkling measured
Terminal-Bench 4 (Vals AI)58.1%0.5%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%19.2%Claude Fable 5.1
Code migration (Vals AI)54.6%11.8%Claude Fable 5.1
ProgramBench (Vals AI)7.0%0.0%Claude Fable 5.1
IOI (Vals AI)90.8%14.9%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%47.6%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%7.3%Claude Fable 5.1
SkillsBench (Vals AI)61.5%26.1%Claude Fable 5.1
CyberBench (Vals AI)70.4%66.8%Claude Fable 5.1
SciCode63.1%47.0%Claude Fable 5.1
FrontierCode50.9%14.0%Claude Fable 5.1
FrontierSWE56.3%4.1%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%32.3%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2946.0Claude Fable 5.1
LMArena Text: coding15321466Claude Fable 5.1
LMArena Text: software and IT15301465Claude Fable 5.1
LMArena WebDev: React17921404Claude Fable 5.1
LMArena WebDev: HTML16841399Claude Fable 5.1
LMArena WebDev: from an image1722Not measuredOnly Claude Fable 5.1 measured
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 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
AA Intelligence Index53.425.0Claude Fable 5.1
Epoch Capabilities Index166.5148.4Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index110
Agentic work benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
AA Agentic Index57.922.5Claude Fable 5.1
Design Arena: agents building web apps13181196Claude Fable 5.1
Design Arena: agents building full-stack apps1326Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building mobile apps1267Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building Godot games1327Not measuredOnly Claude Fable 5.1 measured
Design Arena: PowerPoint slides1305Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets1380Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%59.9%Claude Fable 5.1
LiveBench browser100.0%16.0%Claude Fable 5.1
LiveBench long agentic80.8%14.1%Claude Fable 5.1
SREBench (Vals AI)22.9%0.0%Claude Fable 5.1
Finance Agent (Vals AI)58.9%46.6%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%15.3%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%28.4%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured3.8%Only Inkling measured
Excel Modeling Benchmark (Vals AI)76.7%38.4%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
APEX-Agents68.6%33.8%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422Not measuredOnly Claude Fable 5.1 measured
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
GPQA Diamond93.4%87.1%Claude Fable 5.1
LiveBench reasoning91.7%78.3%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%78.5%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%87.2%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%31.9%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured88.3%Only Inkling measured
ARC-AGI97.5%79.5%Claude Fable 5.1
ARC-AGI-290.0%36.5%Claude Fable 5.1
SimpleBenchNot measured50.0%Only Inkling measured
Chess puzzles48.0%21.0%Claude Fable 5.1
Mystery game puzzles58.0%Not measuredOnly Claude Fable 5.1 measured
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281451Claude Fable 5.1
LMArena Text: expert15441466Claude Fable 5.1
LMArena Text: hard prompts in English15221448Claude Fable 5.1
LMArena Vision: diagrams1343Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: homework1345Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
OTIS Mock AIME100.0%88.9%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%33.3%Claude Fable 5.1
FrontierMath, tier 487.8%4.9%Claude Fable 5.1
ProofBench100.0%0.0%Claude Fable 5.1
LMArena Text: math15311479Claude Fable 5.1
LMArena Text: mathematical work15411460Claude Fable 5.1
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
MMLU Pro92.4%86.3%Claude Fable 5.1
LegalBench (Vals AI)88.5%83.0%Claude Fable 5.1
CorpFin (Vals AI)Not measured68.6%Only Inkling measured
TaxEval (Vals AI)76.0%75.3%Claude Fable 5.1
MortgageTax (Vals AI)70.8%64.0%Claude Fable 5.1
MedCode (Vals AI)53.5%41.2%Claude Fable 5.1
SimpleQA Verified70.8%40.3%Claude Fable 5.1
LMArena Text: science15321455Claude Fable 5.1
LMArena Text: medicine and healthcare15311447Claude Fable 5.1
LMArena Text: legal and government15141448Claude Fable 5.1
LMArena Text: business and finance14931438Claude Fable 5.1
Neither model has a result on the other 7 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index90
Web design benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
Design Arena: websites13121224Claude Fable 5.1
Design Arena: UI components13361198Claude Fable 5.1
Design Arena: game dev13811165Claude Fable 5.1
Design Arena: data viz13441156Claude Fable 5.1
Design Arena: 3D13921160Claude Fable 5.1
Design Arena: all code categories13351205Claude Fable 5.1
Design Arena: SVG13001108Claude Fable 5.1
Design Arena: ASCII art13231089Claude Fable 5.1
LiveBench design83.4%58.3%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index240
General benchmarks for Claude Fable 5.1 and Inkling
BenchmarkClaude Fable 5.1InklingLeader
Vals IndexNot measured29.0%Only Inkling measured
LiveBench data analysis80.3%72.8%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%58.5%Claude Fable 5.1
SAGE (Vals AI)48.5%36.5%Claude Fable 5.1
MedScribe (Vals AI)91.3%85.4%Claude Fable 5.1
Vals Multimodal IndexNot measured49.4%Only Inkling measured
Long context reasoning (AA-LCR)85.3%77.3%Claude Fable 5.1
DTBench97.6%87.5%Claude Fable 5.1
LMCA65.5%37.6%Claude Fable 5.1
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text15121442Claude Fable 5.1
LMArena Text: instruction following15181425Claude Fable 5.1
LMArena Text: creative writing15091390Claude Fable 5.1
LMArena Vision1319Not measuredOnly Claude Fable 5.1 measured
LMArena Text: English15061442Claude Fable 5.1
LMArena Text: non-English15081434Claude Fable 5.1
LMArena Text: Chinese15841493Claude Fable 5.1
LMArena Text: German14991445Claude Fable 5.1
LMArena Text: Japanese15621429Claude Fable 5.1
LMArena Text: Korean15171403Claude Fable 5.1
LMArena Text: French15231455Claude Fable 5.1
LMArena Text: Spanish15201449Claude Fable 5.1
LMArena Text: Russian15201430Claude Fable 5.1
LMArena Text: Polish15251450Claude Fable 5.1
LMArena Text: multi-turn14931437Claude Fable 5.1
LMArena Text: longer queries15241435Claude Fable 5.1
LMArena Text: writing and language15101404Claude Fable 5.1
LMArena Text: entertainment and media14971394Claude Fable 5.1
LMArena Vision: English1313Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: Chinese1391Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: reading text1327Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: humor1318Not measuredOnly Claude Fable 5.1 measured
LMArena Vision: creative writing1330Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 13 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 Inkling
BenchmarkClaude Fable 5.1InklingLeader
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
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Inkling$0.061Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Inkling$0.235Fits in one request

Inkling 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 Inkling
SpecificationAnthropic Claude Fable 5.1Thinking Machines Inkling
MakerAnthropicThinking Machines
WeightsNo public weights listedOpen weights
ReleasedSeptember 1, 2026July 17, 2026
Context window1M524K
Input $/Mtok$10.00$0.975
Output $/Mtok$50.00$4.05
Coding index84.231.5
Independent measurements behind it56
Cost per solved taskNot computable$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Inkling for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 31.5 for Inkling, though on 5 benchmarks against 6. Pick Inkling for output tokens 12.3x cheaper ($4.05 vs $50.00 per million).

Which is cheaper, Claude Fable 5.1 or Inkling?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Inkling costs $0.975 and $4.05. Cost per solved task is known for Inkling only.

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

Claude Fable 5.1, with 1M tokens against 524K.

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

95 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 Inkling's on 6. 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-5-1-vs-thinkingmachines-inkling">LLMBenchmark.ai, Claude Fable 5.1 vs Inkling</a></p>