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Claude Fable 5 vs Inkling

Claude Fable 5 leads Inkling on coding, 79.3 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 Replace Inkling
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
94
T InklingThinking Machines
Coding
31.5
Overall
46.5
Output $/M
$4.05
1
vs boards won of 95 shared

Claude Fable 5 or Inkling: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 31.5 for Inkling.

Pick Inkling for output tokens 12.3x cheaper ($4.05 vs $50.00 per million) and a lower cost per solved task ($0.76 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BInklingThinking Machines31.5/1006 independent benchmarks$0.76 per solved task
Shared results
95
Claude Fable 5 only
32
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 79.3 from 6 benchmarks, Inkling 31.5 from 6 benchmarks.
Widest category
Math, 43.4 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: Claude Fable 5 95.0% against Inkling 0.0%, 95.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Inkling $4.05 per million output tokens, 12.3x apart.
Context window
Claude Fable 5 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 5BarsInklingTies
Coding190
Intelligence20
Agentic work100
Reasoning121
Math60
Knowledge110
Web design90
General250
All shared boards941
CodingLike-for-likeSix of these boards feed the Vibe Coding Index190
Coding benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
LiveBench coding98.3%64.0%Claude Fable 5
LMArena WebDev16241414Claude Fable 5
AA Coding Index76.552.1Claude Fable 5
LiveCodeBench (Vals AI)89.8%85.5%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%77.6%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%0.5%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%19.2%Claude Fable 5
Code migration (Vals AI)55.1%11.8%Claude Fable 5
ProgramBench (Vals AI)2.0%0.0%Claude Fable 5
IOI (Vals AI)Not measured14.9%Only Inkling measured
Terminal-Bench 2.1 (Vals AI)80.5%47.6%Claude Fable 5
Vibe Code Bench 1-100 (Vals AI)Not measured7.3%Only Inkling measured
SkillsBench (Vals AI)Not measured26.1%Only Inkling measured
CyberBench (Vals AI)Not measured66.8%Only Inkling measured
SciCode61.0%47.0%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%14.0%Claude Fable 5
FrontierSWE47.0%4.1%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%32.3%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3946.0Claude Fable 5
LMArena Text: coding15181466Claude Fable 5
LMArena Text: software and IT15131465Claude Fable 5
LMArena WebDev: React16311404Claude Fable 5
LMArena WebDev: HTML16511399Claude Fable 5
LMArena WebDev: from an image1623Not measuredOnly Claude Fable 5 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 and Inkling
BenchmarkClaude Fable 5InklingLeader
AA Intelligence Index49.625.0Claude Fable 5
Epoch Capabilities Index163.4148.4Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index100
Agentic work benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
AA Agentic Index50.722.5Claude Fable 5
Design Arena: agents building web apps12611196Claude Fable 5
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%59.9%Claude Fable 5
LiveBench browser92.0%16.0%Claude Fable 5
LiveBench long agentic53.2%14.1%Claude Fable 5
SREBench (Vals AI)Not measured0.0%Only Inkling measured
Finance Agent (Vals AI)56.3%46.6%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%15.3%Claude Fable 5
Legal Research Bench (Vals AI)49.5%28.4%Claude Fable 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured3.8%Only Inkling measured
Excel Modeling Benchmark (Vals AI)73.7%38.4%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%33.8%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 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
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
GPQA Diamond93.2%87.1%Claude Fable 5
LiveBench reasoning89.7%78.3%Claude Fable 5
MMMU Pro (Vals AI)89.3%78.5%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%87.2%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%31.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%88.3%Inkling
ARC-AGI98.5%79.5%Claude Fable 5
ARC-AGI-289.2%36.5%Claude Fable 5
SimpleBench81.9%50.0%Claude Fable 5
Chess puzzles47.0%21.0%Claude Fable 5
Mystery game puzzles52.0%Not measuredOnly Claude Fable 5 measured
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071451Claude Fable 5
LMArena Text: expert15341466Claude Fable 5
LMArena Text: hard prompts in English15091448Claude Fable 5
LMArena Vision: diagrams1357Not measuredOnly Claude Fable 5 measured
LMArena Vision: homework1361Not measuredOnly Claude Fable 5 measured
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 index60
Math benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
OTIS Mock AIME100.0%88.9%Claude Fable 5
FrontierMath, tiers 1 to 387.0%33.3%Claude Fable 5
FrontierMath, tier 490.2%4.9%Claude Fable 5
ProofBench95.0%0.0%Claude Fable 5
LMArena Text: math15161479Claude Fable 5
LMArena Text: mathematical work15151460Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index110
Knowledge benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
MMLU Pro91.5%86.3%Claude Fable 5
LegalBench (Vals AI)88.6%83.0%Claude Fable 5
CorpFin (Vals AI)71.8%68.6%Claude Fable 5
TaxEval (Vals AI)76.9%75.3%Claude Fable 5
MortgageTax (Vals AI)68.9%64.0%Claude Fable 5
MedCode (Vals AI)56.1%41.2%Claude Fable 5
SimpleQA Verified70.7%40.3%Claude Fable 5
LMArena Text: science15061455Claude Fable 5
LMArena Text: medicine and healthcare14801447Claude Fable 5
LMArena Text: legal and government14981448Claude Fable 5
LMArena Text: business and finance14801438Claude Fable 5
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 and Inkling
BenchmarkClaude Fable 5InklingLeader
Design Arena: websites12951224Claude Fable 5
Design Arena: UI components13161198Claude Fable 5
Design Arena: game dev13351165Claude Fable 5
Design Arena: data viz13041156Claude Fable 5
Design Arena: 3D13181160Claude Fable 5
Design Arena: all code categories13101205Claude Fable 5
Design Arena: SVG13021108Claude Fable 5
Design Arena: ASCII art13291089Claude Fable 5
LiveBench design84.7%58.3%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index250
General benchmarks for Claude Fable 5 and Inkling
BenchmarkClaude Fable 5InklingLeader
Vals IndexNot measured29.0%Only Inkling measured
LiveBench data analysis80.5%72.8%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%58.5%Claude Fable 5
SAGE (Vals AI)51.9%36.5%Claude Fable 5
MedScribe (Vals AI)88.5%85.4%Claude Fable 5
Vals Multimodal Index74.2%49.4%Claude Fable 5
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%77.3%Claude Fable 5
DTBench98.4%87.5%Claude Fable 5
LMCA61.2%37.6%Claude Fable 5
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
LMArena Text14911442Claude Fable 5
LMArena Text: instruction following15021425Claude Fable 5
LMArena Text: creative writing14941390Claude Fable 5
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981442Claude Fable 5
LMArena Text: non-English14821434Claude Fable 5
LMArena Text: Chinese15431493Claude Fable 5
LMArena Text: German14861445Claude Fable 5
LMArena Text: Japanese15041429Claude Fable 5
LMArena Text: Korean14871403Claude Fable 5
LMArena Text: French15051455Claude Fable 5
LMArena Text: Spanish14981449Claude Fable 5
LMArena Text: Russian15031430Claude Fable 5
LMArena Text: Polish14941450Claude Fable 5
LMArena Text: multi-turn15041437Claude Fable 5
LMArena Text: longer queries15101435Claude Fable 5
LMArena Text: writing and language15011404Claude Fable 5
LMArena Text: entertainment and media14821394Claude Fable 5
LMArena Vision: English1323Not measuredOnly Claude Fable 5 measured
LMArena Vision: Chinese1373Not measuredOnly Claude Fable 5 measured
LMArena Vision: reading text1337Not measuredOnly Claude Fable 5 measured
LMArena Vision: humor1341Not measuredOnly Claude Fable 5 measured
LMArena Vision: creative writing1338Not measuredOnly Claude Fable 5 measured
LMArena Document1496Not measuredOnly Claude Fable 5 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 and Inkling
BenchmarkClaude Fable 5InklingLeader
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
Inkling$0.0030Fits in one request

Inkling costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Inkling$0.061Fits in one request

Inkling costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$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 and Inkling
SpecificationAnthropic Claude Fable 5Thinking Machines Inkling
MakerAnthropicThinking Machines
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026July 17, 2026
Context window1M524K
Input $/Mtok$10.00$0.975
Output $/Mtok$50.00$4.05
Coding index79.331.5
Independent measurements behind it66
Cost per solved task$2.16$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Inkling for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 31.5 for Inkling. Pick Inkling for output tokens 12.3x cheaper ($4.05 vs $50.00 per million) and a lower cost per solved task ($0.76 against $2.16).

Which is cheaper, Claude Fable 5 or Inkling?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Inkling costs $0.975 and $4.05. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Inkling $0.76.

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

Claude Fable 5, with 1M tokens against 524K.

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

95 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 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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<iframe src="https://llmbenchmark.ai/embed/compare/claude-fable-5-vs-thinkingmachines-inkling" title="Claude Fable 5 vs Inkling, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/claude-fable-5-vs-thinkingmachines-inkling">LLMBenchmark.ai, Claude Fable 5 vs Inkling</a></p>