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Claude Fable 5.1 vs Kimi K3

Claude Fable 5.1 leads Kimi K3 on coding, 84.2 to 62.3 on the Vibe Coding Index, and Kimi K3 costs 3.3x less per output token ($15.00 vs $50.00 per million). Updated October 22, 2026; 104 benchmarks have a result for both.

Replace Claude Fable 5.1 Replace Kimi K3
Claude Fable 5.1Anthropic
Coding
84.2
Overall
84.7
Output $/M
$50.00
95
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
9
vs boards won of 104 shared

Claude Fable 5.1 or Kimi K3: which to pick

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.3 for Kimi K3, though on 5 benchmarks against 6.

Pick Kimi K3 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Fable 5.1Anthropic84.2/1005 independent benchmarksNo cost per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
104
Claude Fable 5.1 only
20
Kimi K3 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 5.1 84.2 from 5 benchmarks, Kimi K3 62.3 from 6 benchmarks.
Widest category
Agentic work, 19.5 points apart on average over 18 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5.1 100.0% against Kimi K3 16.0%, 84.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Kimi K3 $15.00 per million output tokens, 3.3x apart.
Context window
Claude Fable 5.1 takes 1M tokens, Kimi K3 1.05M.

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 5.1BarsKimi K3Ties
Coding221
Intelligence20
Agentic work171
Reasoning120
Math60
Knowledge100
Web design35
General232
All shared boards959
CodingLike-for-likeSix of these boards feed the Vibe Coding Index221
Coding benchmarks for Claude Fable 5.1 and Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
LiveBench coding97.7%59.3%Claude Fable 5.1
LMArena WebDev17431655Claude Fable 5.1
AA Coding Index81.676.2Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%87.2%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured93.4%Only Kimi K3 measured
Terminal-Bench 4 (Vals AI)58.1%17.2%Claude Fable 5.1
Vibe Code Bench (Vals AI)90.3%85.0%Claude Fable 5.1
Code migration (Vals AI)54.6%16.1%Claude Fable 5.1
ProgramBench (Vals AI)7.0%2.0%Claude Fable 5.1
IOI (Vals AI)90.8%48.9%Claude Fable 5.1
Terminal-Bench 2.1 (Vals AI)85.0%80.9%Claude Fable 5.1
SWE-bench Multimodal (Vals AI)61.3%44.2%Claude Fable 5.1
Vibe Code Bench 1-100 (Vals AI)28.0%18.2%Claude Fable 5.1
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%75.2%Kimi K3
SciCode63.1%59.5%Claude Fable 5.1
FrontierCode50.9%44.2%Claude Fable 5.1
FrontierSWE56.3%25.9%Claude Fable 5.1
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%82.6%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.21524.5Claude Fable 5.1
LMArena Text: coding15321508Claude Fable 5.1
LMArena Text: software and IT15301499Claude Fable 5.1
LMArena WebDev: React17921670Claude Fable 5.1
LMArena WebDev: HTML16841644Claude Fable 5.1
LMArena WebDev: from an image17221579Claude Fable 5.1
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 Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
AA Intelligence Index53.443.6Claude Fable 5.1
Epoch Capabilities Index166.5157.9Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index171
Agentic work benchmarks for Claude Fable 5.1 and Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
AA Agentic Index57.950.0Claude Fable 5.1
Design Arena: agents building web apps13181295Claude Fable 5.1
Design Arena: agents building full-stack apps13261315Claude Fable 5.1
Design Arena: agents building mobile apps12671269Kimi K3
Design Arena: agents building Android appsNot measured1253Only Kimi K3 measured
Design Arena: agents building Godot games13271223Claude Fable 5.1
Design Arena: agents building gamesNot measured1252Only Kimi K3 measured
Design Arena: HTML slidesNot measured1206Only Kimi K3 measured
Design Arena: PowerPoint slides13051247Claude Fable 5.1
Design Arena: spreadsheets13801070Claude Fable 5.1
LiveBench research82.0%79.0%Claude Fable 5.1
LiveBench browser100.0%16.0%Claude Fable 5.1
LiveBench long agentic80.8%42.8%Claude Fable 5.1
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%53.1%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%33.4%Claude Fable 5.1
Legal Research Bench (Vals AI)55.3%46.1%Claude Fable 5.1
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)76.7%66.7%Claude Fable 5.1
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)40.0%1.4%Claude Fable 5.1
Time Horizon Index (Vals AI)63.3%10.5%Claude Fable 5.1
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%47.8%Claude Fable 5.1
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
PostTrainBenchNot measured32.0%Only Kimi K3 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$5,165Claude Fable 5.1
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 index120
Reasoning benchmarks for Claude Fable 5.1 and Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
GPQA Diamond93.4%92.9%Claude Fable 5.1
LiveBench reasoning91.7%90.7%Claude Fable 5.1
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%88.2%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%93.5%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%46.9%Claude Fable 5.1
GPQA Diamond (Epoch AI run)Not measured93.1%Only Kimi K3 measured
ARC-AGI97.5%94.5%Claude Fable 5.1
ARC-AGI-290.0%60.4%Claude Fable 5.1
SimpleBenchNot measured60.7%Only Kimi K3 measured
Chess puzzles48.0%37.0%Claude Fable 5.1
Mystery game puzzles58.0%26.0%Claude Fable 5.1
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281495Claude Fable 5.1
LMArena Text: expert15441520Claude Fable 5.1
LMArena Text: hard prompts in English15221496Claude 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 Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
OTIS Mock AIME100.0%97.2%Claude Fable 5.1
FrontierMath, tiers 1 to 390.2%72.2%Claude Fable 5.1
FrontierMath, tier 487.8%39.0%Claude Fable 5.1
ProofBench100.0%87.0%Claude Fable 5.1
LMArena Text: math15311494Claude Fable 5.1
LMArena Text: mathematical work15411505Claude 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 Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
MMLU Pro92.4%88.0%Claude Fable 5.1
LegalBench (Vals AI)88.5%86.2%Claude Fable 5.1
CorpFin (Vals AI)Not measured71.6%Only Kimi K3 measured
TaxEval (Vals AI)76.0%75.7%Claude Fable 5.1
MortgageTax (Vals AI)70.8%66.3%Claude Fable 5.1
MedCode (Vals AI)53.5%49.4%Claude Fable 5.1
SimpleQA Verified70.8%50.6%Claude Fable 5.1
LMArena Text: science15321508Claude Fable 5.1
LMArena Text: medicine and healthcare15311489Claude Fable 5.1
LMArena Text: legal and government15141503Claude Fable 5.1
LMArena Text: business and finance14931470Claude 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 index35
Web design benchmarks for Claude Fable 5.1 and Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
Design Arena: websites13121334Kimi K3
Design Arena: UI components13361341Kimi K3
Design Arena: game dev13811358Claude Fable 5.1
Design Arena: data viz13441351Kimi K3
Design Arena: 3D13921387Claude Fable 5.1
Design Arena: all code categories13351360Kimi K3
Design Arena: SVG13001302Kimi K3
Design Arena: ASCII art1323Not measuredOnly Claude Fable 5.1 measured
LiveBench design83.4%77.2%Claude Fable 5.1
GeneralLike-for-likePublic boards, shown as published, kept out of the index232
General benchmarks for Claude Fable 5.1 and Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysis80.3%78.7%Claude Fable 5.1
Public Benefits Bench (Vals AI)74.9%68.2%Claude Fable 5.1
SAGE (Vals AI)48.5%52.8%Kimi K3
MedScribe (Vals AI)91.3%88.0%Claude Fable 5.1
Vals Multimodal IndexNot measured73.4%Only Kimi K3 measured
Long context reasoning (AA-LCR)85.3%88.7%Kimi K3
DTBench97.6%91.2%Claude Fable 5.1
LMCA65.5%52.7%Claude Fable 5.1
Surface Evolver BenchNot measured95.0%Only Kimi K3 measured
Furniture assembly70.0%34.2%Claude Fable 5.1
LMArena Text15121476Claude Fable 5.1
LMArena Text: instruction following15181485Claude Fable 5.1
LMArena Text: creative writing15091457Claude Fable 5.1
LMArena Vision1319Not measuredOnly Claude Fable 5.1 measured
LMArena Text: English15061481Claude Fable 5.1
LMArena Text: non-English15081466Claude Fable 5.1
LMArena Text: Chinese15841529Claude Fable 5.1
LMArena Text: German14991490Claude Fable 5.1
LMArena Text: Japanese15621494Claude Fable 5.1
LMArena Text: Korean15171460Claude Fable 5.1
LMArena Text: French15231492Claude Fable 5.1
LMArena Text: Spanish15201472Claude Fable 5.1
LMArena Text: Russian15201485Claude Fable 5.1
LMArena Text: Polish15251458Claude Fable 5.1
LMArena Text: multi-turn14931489Claude Fable 5.1
LMArena Text: longer queries15241494Claude Fable 5.1
LMArena Text: writing and language15101471Claude Fable 5.1
LMArena Text: entertainment and media14971453Claude 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 12 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 Kimi K3
BenchmarkClaude Fable 5.1Kimi K3Leader
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
Kimi K3$0.011Fits in one request

Kimi K3 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Kimi K3$0.195Fits in one request

Kimi K3 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Kimi K3$0.750Fits in one request

Kimi K3 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 Kimi K3
SpecificationAnthropic Claude Fable 5.1MoonshotAI Kimi K3
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 1, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$10.00$3.00
Output $/Mtok$50.00$15.00
Coding index84.262.3
Independent measurements behind it56
Cost per solved taskNot computable$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Kimi K3 for coding?

Pick Claude Fable 5.1 for coding: it scores 84.2 on the Vibe Coding Index against 62.3 for Kimi K3, though on 5 benchmarks against 6. Pick Kimi K3 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Fable 5.1 or Kimi K3?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Cost per solved task is known for Kimi K3 only.

Which has the bigger context window, Claude Fable 5.1 or Kimi K3?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5.1 vs Kimi K3 comparison based on?

104 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 Kimi K3's on 6. Where only one model has a result, the page says so instead of naming a winner.

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