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Claude Fable 5 vs Kimi K3

Claude Fable 5 leads Kimi K3 on coding, 79.3 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 21, 2026; 108 benchmarks have a result for both.

Replace Claude Fable 5 Replace Kimi K3
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
84
Kimi K3Moonshot AI
Coding
62.3
Overall
66.5
Output $/M
$15.00
21
vs boards won of 108 shared, 3 tied

Claude Fable 5 or Kimi K3: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 62.3 for Kimi K3.

Pick Kimi K3 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a lower cost per solved task ($0.81 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BKimi K3Moonshot AI62.3/1006 independent benchmarks$0.81 per solved task
Shared results
108
Claude Fable 5 only
19
Kimi K3 only
9
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, Kimi K3 62.3 from 6 benchmarks.
Widest category
Math, 13.7 points apart on average over 6 shared benchmarks.
Widest single gap
LiveBench browser: Claude Fable 5 92.0% against Kimi K3 16.0%, 76.0 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Kimi K3 $15.00 per million output tokens, 3.3x apart.
Context window
Claude Fable 5 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 5BarsKimi K3Ties
Coding1631 tie
Intelligence20
Agentic work173
Reasoning113
Math60
Knowledge83
Web design161 tie
General2331 tie
All shared boards84213 ties
CodingLike-for-likeSix of these boards feed the Vibe Coding Index163
Coding benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
LiveBench coding98.3%59.3%Claude Fable 5
LMArena WebDev16241655Kimi K3
AA Coding Index76.576.2Claude Fable 5
LiveCodeBench (Vals AI)89.8%87.2%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%93.4%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%17.2%Claude Fable 5
Vibe Code Bench (Vals AI)90.3%85.0%Claude Fable 5
Code migration (Vals AI)55.1%16.1%Claude Fable 5
ProgramBench (Vals AI)2.0%2.0%Tie
IOI (Vals AI)Not measured48.9%Only Kimi K3 measured
Terminal-Bench 2.1 (Vals AI)80.5%80.9%Kimi K3
SWE-bench Multimodal (Vals AI)Not measured44.2%Only Kimi K3 measured
Vibe Code Bench 1-100 (Vals AI)Not measured18.2%Only Kimi K3 measured
CyberBench (Vals AI)Not measured75.2%Only Kimi K3 measured
SciCode61.0%59.5%Claude Fable 5
Terminal-Bench Hard (Artificial Analysis run)62.9%Not measuredOnly Claude Fable 5 measured
FrontierCode53.5%44.2%Claude Fable 5
FrontierSWE47.0%25.9%Claude Fable 5
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%82.6%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.31524.5Claude Fable 5
LMArena Text: coding15181508Claude Fable 5
LMArena Text: software and IT15131499Claude Fable 5
LMArena WebDev: React16311670Kimi K3
LMArena WebDev: HTML16511644Claude Fable 5
LMArena WebDev: from an image16231579Claude Fable 5
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 Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
AA Intelligence Index49.643.6Claude Fable 5
Epoch Capabilities Index163.4157.9Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index173
Agentic work benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
AA Agentic Index50.750.0Claude Fable 5
Design Arena: agents building web apps12611295Kimi K3
Design Arena: agents building full-stack apps12801315Kimi K3
Design Arena: agents building mobile apps12641269Kimi K3
Design Arena: agents building Android apps12831250Claude Fable 5
Design Arena: agents building Godot games12921223Claude Fable 5
Design Arena: agents building games12851252Claude Fable 5
Design Arena: HTML slides12771256Claude Fable 5
Design Arena: PowerPoint slides12951273Claude Fable 5
Design Arena: spreadsheetsNot measured1058Only Kimi K3 measured
LiveBench research86.9%79.0%Claude Fable 5
LiveBench browser92.0%16.0%Claude Fable 5
LiveBench long agentic53.2%42.8%Claude Fable 5
Finance Agent (Vals AI)56.3%53.1%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%33.4%Claude Fable 5
Legal Research Bench (Vals AI)49.5%46.1%Claude Fable 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured12.9%Only Kimi K3 measured
Excel Modeling Benchmark (Vals AI)73.7%66.7%Claude Fable 5
BioMysteryBench (Vals AI)Not measured72.6%Only Kimi K3 measured
Terminal-Bench-Science (Vals AI)15.7%1.4%Claude Fable 5
Time Horizon Index (Vals AI)Not measured10.5%Only Kimi K3 measured
τ²-Bench Telecom98.5%Not measuredOnly Claude Fable 5 measured
APEX-Agents63.6%47.8%Claude Fable 5
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%32.0%Claude Fable 5
Vending-Bench 2$5,680$5,165Claude Fable 5
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index113
Reasoning benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
GPQA Diamond93.2%92.9%Claude Fable 5
LiveBench reasoning89.7%90.7%Kimi K3
MMMU Pro (Vals AI)89.3%88.2%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%93.5%Kimi K3
Humanity's Last Exam (Artificial Analysis run)55.5%46.9%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%93.1%Kimi K3
ARC-AGI98.5%94.5%Claude Fable 5
ARC-AGI-289.2%60.4%Claude Fable 5
SimpleBench81.9%60.7%Claude Fable 5
Chess puzzles47.0%37.0%Claude Fable 5
Mystery game puzzles52.0%26.0%Claude Fable 5
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071495Claude Fable 5
LMArena Text: expert15341520Claude Fable 5
LMArena Text: hard prompts in English15091496Claude 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 Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
OTIS Mock AIME100.0%97.2%Claude Fable 5
FrontierMath, tiers 1 to 387.0%72.2%Claude Fable 5
FrontierMath, tier 490.2%39.0%Claude Fable 5
ProofBench95.0%87.0%Claude Fable 5
LMArena Text: math15161494Claude Fable 5
LMArena Text: mathematical work15151505Claude Fable 5
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index83
Knowledge benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
MMLU Pro91.5%88.0%Claude Fable 5
LegalBench (Vals AI)88.6%86.2%Claude Fable 5
CorpFin (Vals AI)71.8%71.6%Claude Fable 5
TaxEval (Vals AI)76.9%75.7%Claude Fable 5
MortgageTax (Vals AI)68.9%66.3%Claude Fable 5
MedCode (Vals AI)56.1%49.4%Claude Fable 5
SimpleQA Verified70.7%50.6%Claude Fable 5
LMArena Text: science15061508Kimi K3
LMArena Text: medicine and healthcare14801489Kimi K3
LMArena Text: legal and government14981503Kimi K3
LMArena Text: business and finance14801470Claude 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 index16
Web design benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
Design Arena: websites12961335Kimi K3
Design Arena: UI components13191344Kimi K3
Design Arena: game dev13351359Kimi K3
Design Arena: data viz13041351Kimi K3
Design Arena: 3D13191388Kimi K3
Design Arena: all code categories13101360Kimi K3
Design Arena: SVG13021302Tie
Design Arena: ASCII art1329Not measuredOnly Claude Fable 5 measured
LiveBench design84.7%77.2%Claude Fable 5
GeneralLike-for-likePublic boards, shown as published, kept out of the index233
General benchmarks for Claude Fable 5 and Kimi K3
BenchmarkClaude Fable 5Kimi K3Leader
Vals IndexNot measured53.0%Only Kimi K3 measured
LiveBench data analysis80.5%78.7%Claude Fable 5
Public Benefits Bench (Vals AI)70.4%68.2%Claude Fable 5
SAGE (Vals AI)51.9%52.8%Kimi K3
MedScribe (Vals AI)88.5%88.0%Claude Fable 5
Vals Multimodal Index74.2%73.4%Claude Fable 5
IFBench63.5%Not measuredOnly Claude Fable 5 measured
Long context reasoning (AA-LCR)82.3%88.7%Kimi K3
DTBench98.4%91.2%Claude Fable 5
LMCA61.2%52.7%Claude Fable 5
Surface Evolver Bench95.0%95.0%Tie
Furniture assembly35.8%34.2%Claude Fable 5
LMArena Text14911476Claude Fable 5
LMArena Text: instruction following15021485Claude Fable 5
LMArena Text: creative writing14941457Claude Fable 5
LMArena Vision1325Not measuredOnly Claude Fable 5 measured
LMArena Text: English14981481Claude Fable 5
LMArena Text: non-English14821466Claude Fable 5
LMArena Text: Chinese15431529Claude Fable 5
LMArena Text: German14861490Kimi K3
LMArena Text: Japanese15041494Claude Fable 5
LMArena Text: Korean14871460Claude Fable 5
LMArena Text: French15051492Claude Fable 5
LMArena Text: Spanish14981472Claude Fable 5
LMArena Text: Russian15031485Claude Fable 5
LMArena Text: Polish14941458Claude Fable 5
LMArena Text: multi-turn15041489Claude Fable 5
LMArena Text: longer queries15101494Claude Fable 5
LMArena Text: writing and language15011471Claude Fable 5
LMArena Text: entertainment and media14821453Claude 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 Kimi K3
BenchmarkClaude Fable 5Kimi 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$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$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$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 and Kimi K3
SpecificationAnthropic Claude Fable 5MoonshotAI Kimi K3
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026July 16, 2026
Context window1M1.05M
Input $/Mtok$10.00$3.00
Output $/Mtok$50.00$15.00
Coding index79.362.3
Independent measurements behind it66
Cost per solved task$2.16$0.81
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Kimi K3 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 62.3 for Kimi K3. Pick Kimi K3 for output tokens 3.3x cheaper ($15.00 vs $50.00 per million) and a lower cost per solved task ($0.81 against $2.16).

Which is cheaper, Claude Fable 5 or Kimi K3?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K3 costs $3.00 and $15.00. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Kimi K3 $0.81.

Which has the bigger context window, Claude Fable 5 or Kimi K3?

Kimi K3, with 1.05M tokens against 1M.

How many benchmarks is the Claude Fable 5 vs Kimi K3 comparison based on?

108 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5's coding index rests on 6 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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