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Claude Fable 5 vs Kimi K2.5

Claude Fable 5 leads Kimi K2.5 on coding, 79.3 to 38.6 on the Vibe Coding Index, and Kimi K2.5 costs 17.5x less per output token ($2.85 vs $50.00 per million). Updated October 22, 2026; 87 benchmarks have a result for both.

Replace Claude Fable 5 Replace Kimi K2.5
Claude Fable 5Anthropic
Coding
79.3
Overall
79.0
Output $/M
$50.00
86
Kimi K2.5Moonshot AI
Coding
38.6
Overall
44.8
Output $/M
$2.85
1
vs boards won of 87 shared

Claude Fable 5 or Kimi K2.5: which to pick

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 38.6 for Kimi K2.5.

Pick Kimi K2.5 for output tokens 17.5x cheaper ($2.85 vs $50.00 per million) and a lower cost per solved task ($0.24 against $2.16).

Model AClaude Fable 5Anthropic79.3/1006 independent benchmarks$2.16 per solved taskModel BKimi K2.5Moonshot AI38.6/1003 independent benchmarks$0.24 per solved task
Shared results
87
Claude Fable 5 only
40
Kimi K2.5 only
12
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 K2.5 38.6 from 3 benchmarks.
Widest category
Coding, 30.6 points apart on average over 15 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Fable 5 89.2% against Kimi K2.5 11.8%, 77.4 points apart on a 0 to 100 scale.
Output price
Claude Fable 5 $50.00 against Kimi K2.5 $2.85 per million output tokens, 17.5x apart.
Context window
Claude Fable 5 takes 1M tokens, Kimi K2.5 262K.

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 K2.5Ties
Coding150
Intelligence20
Agentic work100
Reasoning130
Math20
Knowledge100
Web design80
General261
All shared boards861
CodingLike-for-likeSix of these boards feed the Vibe Coding Index150
Coding benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LiveBench coding98.3%Not measuredOnly Claude Fable 5 measured
LMArena WebDev16241437Claude Fable 5
AA Coding Index76.546.8Claude Fable 5
LiveCodeBench (Vals AI)89.8%83.9%Claude Fable 5
SWE-bench Verified (Vals AI)95.0%70.0%Claude Fable 5
Terminal-Bench 4 (Vals AI)41.4%Not measuredOnly Claude Fable 5 measured
Vibe Code Bench (Vals AI)90.3%17.5%Claude Fable 5
Code migration (Vals AI)55.1%7.0%Claude Fable 5
ProgramBench (Vals AI)2.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench 2.1 (Vals AI)80.5%42.0%Claude Fable 5
SciCode61.0%Not measuredOnly Claude Fable 5 measured
Terminal-Bench Hard (Artificial Analysis run)62.9%34.8%Claude Fable 5
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
FrontierCode53.5%Not measuredOnly Claude Fable 5 measured
FrontierSWE47.0%Not measuredOnly Claude Fable 5 measured
GSO-Bench78.4%Not measuredOnly Claude Fable 5 measured
WeirdML91.9%45.6%Claude Fable 5
MirrorCode63.9%Not measuredOnly Claude Fable 5 measured
ALE-Bench2041.3821.6Claude Fable 5
LMArena Text: coding15181483Claude Fable 5
LMArena Text: software and IT15131471Claude Fable 5
LMArena WebDev: React16311429Claude Fable 5
LMArena WebDev: HTML16511426Claude Fable 5
LMArena WebDev: from an image16231439Claude Fable 5
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
AA Intelligence Index49.623.5Claude Fable 5
Epoch Capabilities Index163.4148.1Claude Fable 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index100
Agentic work benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
AA Agentic Index50.7Not measuredOnly Claude Fable 5 measured
Design Arena: agents building web apps12611136Claude Fable 5
Design Arena: agents building full-stack apps12801114Claude Fable 5
Design Arena: agents building mobile apps12641147Claude Fable 5
Design Arena: agents building Android apps12841118Claude Fable 5
Design Arena: agents building Godot games12921219Claude Fable 5
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%Not measuredOnly Claude Fable 5 measured
LiveBench browser92.0%Not measuredOnly Claude Fable 5 measured
LiveBench long agentic53.2%Not measuredOnly Claude Fable 5 measured
Finance Agent (Vals AI)56.3%35.8%Claude Fable 5
Tax Agent Bench (Vals AI)38.3%Not measuredOnly Claude Fable 5 measured
Legal Research Bench (Vals AI)49.5%15.9%Claude Fable 5
Excel Modeling Benchmark (Vals AI)73.7%28.5%Claude Fable 5
Terminal-Bench-Science (Vals AI)15.7%Not measuredOnly Claude Fable 5 measured
τ²-Bench Telecom98.5%95.9%Claude Fable 5
APEX-Agents63.6%Not measuredOnly Claude Fable 5 measured
Remote Labor Index16.1%Not measuredOnly Claude Fable 5 measured
PostTrainBench41.8%Not measuredOnly Claude Fable 5 measured
OSWorldNot measured63.3%Only Kimi K2.5 measured
Vending-Bench 2$5,680$1,198Claude Fable 5
LMArena Search1229Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index130
Reasoning benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
GPQA Diamond93.2%84.1%Claude Fable 5
LiveBench reasoning89.7%Not measuredOnly Claude Fable 5 measured
MMMU Pro (Vals AI)89.3%84.3%Claude Fable 5
GPQA Diamond (Artificial Analysis run)92.6%87.9%Claude Fable 5
Humanity's Last Exam (Artificial Analysis run)55.5%30.7%Claude Fable 5
GPQA Diamond (Epoch AI run)85.9%Not measuredOnly Claude Fable 5 measured
ARC-AGI98.5%65.3%Claude Fable 5
ARC-AGI-289.2%11.8%Claude Fable 5
SimpleBench81.9%46.8%Claude Fable 5
Chess puzzles47.0%Not measuredOnly Claude Fable 5 measured
Mystery game puzzles52.0%Not measuredOnly Claude Fable 5 measured
EBR-bench39.5%Not measuredOnly Claude Fable 5 measured
LMArena Text: hard prompts15071453Claude Fable 5
LMArena Text: expert15341466Claude Fable 5
LMArena Text: hard prompts in English15091460Claude Fable 5
LMArena Vision: diagrams13571282Claude Fable 5
LMArena Vision: homework13611297Claude Fable 5
Kagi LLM Benchmark91.4%78.5%Claude Fable 5
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index20
Math benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
AIMENot measured95.6%Only Kimi K2.5 measured
OTIS Mock AIME100.0%Not measuredOnly Claude Fable 5 measured
FrontierMath, tiers 1 to 387.0%Not measuredOnly Claude Fable 5 measured
FrontierMath, tier 490.2%Not measuredOnly Claude Fable 5 measured
ProofBench95.0%Not measuredOnly Claude Fable 5 measured
LMArena Text: math15161470Claude Fable 5
LMArena Text: mathematical work15151473Claude Fable 5
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index100
Knowledge benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
MMLU Pro91.5%85.9%Claude Fable 5
LegalBench (Vals AI)88.6%Not measuredOnly Claude Fable 5 measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)71.8%68.3%Claude Fable 5
TaxEval (Vals AI)76.9%74.2%Claude Fable 5
MortgageTax (Vals AI)68.9%66.5%Claude Fable 5
MedQA (Vals AI)Not measured94.4%Only Kimi K2.5 measured
MedCode (Vals AI)56.1%39.3%Claude Fable 5
SimpleQA Verified70.7%34.3%Claude Fable 5
LMArena Text: science15061459Claude Fable 5
LMArena Text: medicine and healthcare14801448Claude Fable 5
LMArena Text: legal and government14981441Claude Fable 5
LMArena Text: business and finance14801427Claude Fable 5
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
Design Arena: websites12951248Claude Fable 5
Design Arena: UI components13161234Claude Fable 5
Design Arena: game dev13351206Claude Fable 5
Design Arena: data viz13041219Claude Fable 5
Design Arena: 3D13181204Claude Fable 5
Design Arena: all code categories13101236Claude Fable 5
Design Arena: SVG13021149Claude Fable 5
Design Arena: ASCII art13291166Claude Fable 5
LiveBench design84.7%Not measuredOnly Claude Fable 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index261
General benchmarks for Claude Fable 5 and Kimi K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
LiveBench data analysis80.5%Not measuredOnly Claude Fable 5 measured
Public Benefits Bench (Vals AI)70.4%Not measuredOnly Claude Fable 5 measured
SAGE (Vals AI)51.9%49.9%Claude Fable 5
MedScribe (Vals AI)88.5%76.4%Claude Fable 5
Vals Multimodal Index74.2%Not measuredOnly Claude Fable 5 measured
IFBench63.5%70.2%Kimi K2.5
Long context reasoning (AA-LCR)82.3%78.0%Claude Fable 5
DTBench98.4%Not measuredOnly Claude Fable 5 measured
LMCA61.2%Not measuredOnly Claude Fable 5 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
Surface Evolver Bench95.0%Not measuredOnly Claude Fable 5 measured
Furniture assembly35.8%Not measuredOnly Claude Fable 5 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text14911445Claude Fable 5
LMArena Text: instruction following15021431Claude Fable 5
LMArena Text: creative writing14941422Claude Fable 5
LMArena Vision13251269Claude Fable 5
LMArena Text: English14981453Claude Fable 5
LMArena Text: non-English14821433Claude Fable 5
LMArena Text: Chinese15431494Claude Fable 5
LMArena Text: German14861441Claude Fable 5
LMArena Text: Japanese15041423Claude Fable 5
LMArena Text: Korean14871412Claude Fable 5
LMArena Text: French15051454Claude Fable 5
LMArena Text: Spanish14981450Claude Fable 5
LMArena Text: Russian15031435Claude Fable 5
LMArena Text: Polish14941445Claude Fable 5
LMArena Text: multi-turn15041444Claude Fable 5
LMArena Text: longer queries15101445Claude Fable 5
LMArena Text: writing and language15011425Claude Fable 5
LMArena Text: entertainment and media14821417Claude Fable 5
LMArena Vision: English13231274Claude Fable 5
LMArena Vision: Chinese13731328Claude Fable 5
LMArena Vision: reading text13371276Claude Fable 5
LMArena Vision: humor13411284Claude Fable 5
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing thingsNot measured1285Only Kimi K2.5 measured
LMArena Vision: creative writing13381269Claude Fable 5
LMArena Document1496Not measuredOnly Claude Fable 5 measured
Neither model has a result on the other 6 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 K2.5
BenchmarkClaude Fable 5Kimi K2.5Leader
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 K2.5$0.0020Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5$0.650Fits in one request
Kimi K2.5$0.035Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5$2.50Fits in one request
Kimi K2.5$0.135Fits in one request

Kimi K2.5 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 K2.5
SpecificationAnthropic Claude Fable 5MoonshotAI Kimi K2.5
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedJune 9, 2026January 27, 2026
Context window1M262K
Input $/Mtok$10.00$0.532
Output $/Mtok$50.00$2.85
Coding index79.338.6
Independent measurements behind it63
Cost per solved task$2.16$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5 better than Kimi K2.5 for coding?

Pick Claude Fable 5 for coding: it scores 79.3 on the Vibe Coding Index against 38.6 for Kimi K2.5. Pick Kimi K2.5 for output tokens 17.5x cheaper ($2.85 vs $50.00 per million) and a lower cost per solved task ($0.24 against $2.16).

Which is cheaper, Claude Fable 5 or Kimi K2.5?

Claude Fable 5 costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K2.5 costs $0.532 and $2.85. Per solved SWE-bench Verified task, Claude Fable 5 costs $2.16 and Kimi K2.5 $0.24.

Which has the bigger context window, Claude Fable 5 or Kimi K2.5?

Claude Fable 5, with 1M tokens against 262K.

How many benchmarks is the Claude Fable 5 vs Kimi K2.5 comparison based on?

87 benchmarks have a result for both models as of October 22, 2026. Claude Fable 5's coding index rests on 6 independent benchmarks and Kimi K2.5's on 3. Where only one model has a result, the page says so instead of naming a winner.

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