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Claude Fable 5.1 vs Kimi K2.5

Updated October 21, 2026. 79 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Fable 5.1 Replace Kimi K2.5
Claude Fable 5.1Anthropic
Coding
89.1
Overall
53.4
Output $/M
$50.00
78
Kimi K2.5Moonshot AI
Coding
58.5
Overall
23.5
Output $/M
$2.50
1
vs boards won of 79 shared

Decision reading

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 58.5 for Kimi K2.5.

Pick Kimi K2.5 when output tokens cost 20.0x less, or when the benchmark that matters is SAGE (Vals AI), where it leads.

Model AClaude Fable 5.1Anthropic89.1/1002 independent benchmarksNo cost per solved taskModel BKimi K2.5Moonshot AI58.5/1002 independent benchmarks$0.24 per solved task
Shared results
79
Claude Fable 5.1 only
45
Kimi K2.5 only
19
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 89.1 from 2 benchmarks, Kimi K2.5 58.5 from 2 benchmarks.
Widest category
Coding, 34.0 points apart on average over 13 shared benchmarks.
Widest single gap
ARC-AGI-2: Claude Fable 5.1 90.0% against Kimi K2.5 11.8%, 78.2 points apart on a 0 to 100 scale.
Output price
Claude Fable 5.1 $50.00 against Kimi K2.5 $2.50 per million output tokens, 20.0x apart.
Context window
Claude Fable 5.1 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 5.1BarsKimi K2.5Ties
Coding130
Intelligence20
Agentic work80
Reasoning110
Math20
Knowledge90
Web design80
General251
All shared boards781
CodingLike-for-likeFour of these boards feed the Vibe Coding Index130
Coding benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
SWE-bench VerifiedNot measured70.8%Only Kimi K2.5 measured
SWE-bench MultilingualNot measured67.3%Only Kimi K2.5 measured
LiveBench coding97.7%Not measuredOnly Claude Fable 5.1 measured
LMArena WebDev17431437Claude Fable 5.1
AA Coding Index81.646.8Claude Fable 5.1
LiveCodeBench (Vals AI)90.5%83.9%Claude Fable 5.1
SWE-bench Verified (Vals AI)Not measured70.0%Only Kimi K2.5 measured
Terminal-Bench 4 (Vals AI)58.1%Not measuredOnly Claude Fable 5.1 measured
Vibe Code Bench (Vals AI)90.3%17.5%Claude Fable 5.1
Code migration (Vals AI)54.6%7.0%Claude Fable 5.1
ProgramBench (Vals AI)7.0%Not measuredOnly Claude Fable 5.1 measured
IOI (Vals AI)90.8%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench 2.1 (Vals AI)85.0%42.0%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%Not measuredOnly Claude Fable 5.1 measured
SkillsBench (Vals AI)61.5%Not measuredOnly Claude Fable 5.1 measured
CyberBench (Vals AI)70.4%Not measuredOnly Claude Fable 5.1 measured
SciCode63.1%Not measuredOnly Claude Fable 5.1 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured34.8%Only Kimi K2.5 measured
Terminal-BenchNot measured43.2%Only Kimi K2.5 measured
FrontierCode50.9%Not measuredOnly Claude Fable 5.1 measured
FrontierSWE56.3%Not measuredOnly Claude Fable 5.1 measured
GSO-Bench88.2%Not measuredOnly Claude Fable 5.1 measured
WeirdML92.9%45.6%Claude Fable 5.1
MirrorCode73.3%Not measuredOnly Claude Fable 5.1 measured
ALE-Bench2143.2821.6Claude Fable 5.1
LMArena Text: coding15321483Claude Fable 5.1
LMArena Text: software and IT15301471Claude Fable 5.1
LMArena WebDev: React17921429Claude Fable 5.1
LMArena WebDev: HTML16841426Claude Fable 5.1
LMArena WebDev: from an image17221439Claude Fable 5.1
Neither model has a result on the other 7 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
AA Intelligence Index53.423.5Claude Fable 5.1
Epoch Capabilities Index166.5148.1Claude Fable 5.1
Agentic workLike-for-likePublic boards, shown as published, kept out of the index80
Agentic work benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
AA Agentic Index57.9Not measuredOnly Claude Fable 5.1 measured
Design Arena: agents building web apps13181136Claude Fable 5.1
Design Arena: agents building full-stack apps13261114Claude Fable 5.1
Design Arena: agents building mobile apps12671147Claude Fable 5.1
Design Arena: agents building Android appsNot measured1124Only Kimi K2.5 measured
Design Arena: agents building Godot games13271219Claude Fable 5.1
Design Arena: PowerPoint slides1328Not measuredOnly Claude Fable 5.1 measured
Design Arena: spreadsheets1374Not measuredOnly Claude Fable 5.1 measured
LiveBench research82.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench browser100.0%Not measuredOnly Claude Fable 5.1 measured
LiveBench long agentic80.8%Not measuredOnly Claude Fable 5.1 measured
SREBench (Vals AI)22.9%Not measuredOnly Claude Fable 5.1 measured
Finance Agent (Vals AI)58.9%35.8%Claude Fable 5.1
Tax Agent Bench (Vals AI)49.2%Not measuredOnly Claude Fable 5.1 measured
Legal Research Bench (Vals AI)55.3%15.9%Claude Fable 5.1
Excel Modeling Benchmark (Vals AI)76.7%28.5%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
τ²-Bench TelecomNot measured95.9%Only Kimi K2.5 measured
APEX-Agents68.6%Not measuredOnly Claude Fable 5.1 measured
Remote Labor Index17.9%Not measuredOnly Claude Fable 5.1 measured
OSWorldNot measured63.3%Only Kimi K2.5 measured
SpireClimb2.0%Not measuredOnly Claude Fable 5.1 measured
Vending-Bench 2$5,422$1,198Claude Fable 5.1
LMArena Search1246Not measuredOnly Claude Fable 5.1 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
Reasoning benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
GPQA Diamond93.4%84.1%Claude Fable 5.1
LiveBench reasoning91.7%Not measuredOnly Claude Fable 5.1 measured
MysteryMechanism (Vals AI)47.8%Not measuredOnly Claude Fable 5.1 measured
MMMU Pro (Vals AI)90.6%84.3%Claude Fable 5.1
GPQA Diamond (Artificial Analysis run)93.7%87.9%Claude Fable 5.1
Humanity's Last Exam (Artificial Analysis run)59.1%30.7%Claude Fable 5.1
ARC-AGI97.5%65.3%Claude Fable 5.1
ARC-AGI-290.0%11.8%Claude Fable 5.1
SimpleBenchNot measured46.8%Only Kimi K2.5 measured
Chess puzzles48.0%Not measuredOnly Claude Fable 5.1 measured
Mystery game puzzles58.0%Not measuredOnly Claude Fable 5.1 measured
EBR-bench57.1%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: hard prompts15281453Claude Fable 5.1
LMArena Text: expert15441466Claude Fable 5.1
LMArena Text: hard prompts in English15221460Claude Fable 5.1
LMArena Vision: diagrams13431282Claude Fable 5.1
LMArena Vision: homework13451297Claude Fable 5.1
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 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
AIMENot measured95.6%Only Kimi K2.5 measured
OTIS Mock AIME100.0%Not measuredOnly Claude Fable 5.1 measured
FrontierMath, tiers 1 to 390.2%Not measuredOnly Claude Fable 5.1 measured
FrontierMath, tier 487.8%Not measuredOnly Claude Fable 5.1 measured
ProofBench100.0%Not measuredOnly Claude Fable 5.1 measured
LMArena Text: math15311470Claude Fable 5.1
LMArena Text: mathematical work15411473Claude Fable 5.1
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index90
Knowledge benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
MMLU Pro92.4%85.9%Claude Fable 5.1
LegalBench (Vals AI)88.5%Not measuredOnly Claude Fable 5.1 measured
CaseLaw (Vals AI)Not measured58.7%Only Kimi K2.5 measured
CorpFin (Vals AI)Not measured68.3%Only Kimi K2.5 measured
TaxEval (Vals AI)76.0%74.2%Claude Fable 5.1
MortgageTax (Vals AI)70.8%66.5%Claude Fable 5.1
MedQA (Vals AI)Not measured94.4%Only Kimi K2.5 measured
MedCode (Vals AI)53.5%39.3%Claude Fable 5.1
SimpleQA Verified70.8%34.3%Claude Fable 5.1
LMArena Text: science15321459Claude Fable 5.1
LMArena Text: medicine and healthcare15311448Claude Fable 5.1
LMArena Text: legal and government15141441Claude Fable 5.1
LMArena Text: business and finance14931427Claude Fable 5.1
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
Design Arena: websites13131249Claude Fable 5.1
Design Arena: UI components13381236Claude Fable 5.1
Design Arena: game dev13821207Claude Fable 5.1
Design Arena: data viz13441219Claude Fable 5.1
Design Arena: 3D13931205Claude Fable 5.1
Design Arena: all code categories13361236Claude Fable 5.1
Design Arena: SVG13011149Claude Fable 5.1
Design Arena: ASCII art13241165Claude Fable 5.1
LiveBench design83.4%Not measuredOnly Claude Fable 5.1 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index251
General benchmarks for Claude Fable 5.1 and Kimi K2.5
BenchmarkClaude Fable 5.1Kimi K2.5Leader
LiveBench data analysis80.3%Not measuredOnly Claude Fable 5.1 measured
Public Benefits Bench (Vals AI)74.9%Not measuredOnly Claude Fable 5.1 measured
SAGE (Vals AI)48.5%49.9%Kimi K2.5
MedScribe (Vals AI)91.3%76.4%Claude Fable 5.1
IFBenchNot measured70.2%Only Kimi K2.5 measured
Long context reasoning (AA-LCR)85.3%78.0%Claude Fable 5.1
DTBench97.6%Not measuredOnly Claude Fable 5.1 measured
LMCA65.5%Not measuredOnly Claude Fable 5.1 measured
Fiction.LiveBenchNot measured86.1%Only Kimi K2.5 measured
CL-benchNot measured19.3%Only Kimi K2.5 measured
Furniture assembly70.0%Not measuredOnly Claude Fable 5.1 measured
CL-bench LifeNot measured13.2%Only Kimi K2.5 measured
LMArena Text15121445Claude Fable 5.1
LMArena Text: instruction following15181431Claude Fable 5.1
LMArena Text: creative writing15091422Claude Fable 5.1
LMArena Vision13191269Claude Fable 5.1
LMArena Text: English15061453Claude Fable 5.1
LMArena Text: non-English15081433Claude Fable 5.1
LMArena Text: Chinese15841494Claude Fable 5.1
LMArena Text: German14991441Claude Fable 5.1
LMArena Text: Japanese15621423Claude Fable 5.1
LMArena Text: Korean15171412Claude Fable 5.1
LMArena Text: French15231454Claude Fable 5.1
LMArena Text: Spanish15201450Claude Fable 5.1
LMArena Text: Russian15201435Claude Fable 5.1
LMArena Text: Polish15251445Claude Fable 5.1
LMArena Text: multi-turn14931444Claude Fable 5.1
LMArena Text: longer queries15241445Claude Fable 5.1
LMArena Text: writing and language15101425Claude Fable 5.1
LMArena Text: entertainment and media14971417Claude Fable 5.1
LMArena Vision: English13131274Claude Fable 5.1
LMArena Vision: Chinese13911328Claude Fable 5.1
LMArena Vision: reading text13271276Claude Fable 5.1
LMArena Vision: humor13181284Claude Fable 5.1
LMArena Vision: captioningNot measured1257Only Kimi K2.5 measured
LMArena Vision: recognizing thingsNot measured1285Only Kimi K2.5 measured
LMArena Vision: creative writing13301269Claude Fable 5.1
Neither model has a result on the other 9 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 K2.5
BenchmarkClaude Fable 5.1Kimi 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 5.1$0.035Fits in one request
Kimi K2.5$0.0018Fits in one request

Kimi K2.5 costs less

Repository review

50K input + 3K output tokens

Claude Fable 5.1$0.650Fits in one request
Kimi K2.5$0.033Fits in one request

Kimi K2.5 costs less

Agent loop

200K input + 10K output tokens

Claude Fable 5.1$2.50Fits in one request
Kimi K2.5$0.125Fits 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 5.1 and Kimi K2.5
SpecificationAnthropic Claude Fable 5.1MoonshotAI Kimi K2.5
MakerAnthropicMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 1, 2026January 27, 2026
Context window1M262K
Input $/Mtok$10.00$0.50
Output $/Mtok$50.00$2.50
Coding index89.158.5
Independent measurements behind it22
Cost per solved taskNot computable$0.24
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Fable 5.1 better than Kimi K2.5 for coding?

Pick Claude Fable 5.1 for coding: it scores 89.1 on the Vibe Coding Index against 58.5 for Kimi K2.5. Pick Kimi K2.5 when output tokens cost 20.0x less, or when the benchmark that matters is SAGE (Vals AI), where it leads.

Which is cheaper, Claude Fable 5.1 or Kimi K2.5?

Claude Fable 5.1 costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K2.5 costs $0.50 and $2.50. Cost per solved task is known for Kimi K2.5 only.

Which has the bigger context window, Claude Fable 5.1 or Kimi K2.5?

Claude Fable 5.1, with 1M tokens against 262K.

How many benchmarks is the Claude Fable 5.1 vs Kimi K2.5 comparison based on?

79 benchmarks have a result for both models as of October 21, 2026. Claude Fable 5.1's coding index rests on 2 independent benchmarks and Kimi K2.5's on 2. Where only one model has a result, the page says so instead of naming a winner.

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