Head-to-head comparison

Claude Opus 4.5 vs. Kimi K3

Compare published benchmark results from matching versions and cohorts, API pricing, and technical specifications. Any documented test setup differences remain visible.

shared result series: 46
distinct benchmark metrics: 11
latest retrieval: 2026-10-16

First modelSecond model

Specifications

General specifications

Release date, availability, context window, architecture, and published parameter counts at a glance. Undisclosed details remain marked as unavailable.

Specifications for Claude Opus 4.5 and Kimi K3
Attribute	Claude Opus 4.5	Kimi K3
Provider	Anthropic	Moonshot AI
Released	Nov 2025	Jul 16, 2026
Availability	Active	Active
Model type	Proprietary	Open Weights
Parameters	Not published	2.8T, 104B active
Architecture	Not published	Mixture of Experts
Context window	200,000 tokens	1,048,576 tokens
Knowledge cutoff	May 2025	Not published
Technical sources	Model, Context	Model

Pricing

API pricing compared

The table compares official standard API rates per 1M tokens, including published cache pricing. Batch, fast, priority, regional surcharges, tool calls, and cloud platform pricing are excluded.

API pricing for Claude Opus 4.5 and Kimi K3
Price type	Claude Opus 4.5	Kimi K3
API input	$5	$3
API output	$25	$15
Cache read	$0.5	$0.3
Cache write (5 min.)	$6.25	Not listed
Cache write (1 hr.)	$10	Not listed
Price verified	09/22/2026 Source	09/22/2026 Source

Claude Opus 4.5Kimi K3

API inputUSD per 1M tokens, base tier

Claude Opus 4.5$5

Kimi K3$3

API outputUSD per 1M tokens, base tier

Claude Opus 4.5$25

Kimi K3$15

Cache readUSD per 1M tokens, base tier

Claude Opus 4.5$0.5

Kimi K3$0.3

Key to the marks:better valuebetter, but not conclusivetie

Pricing by provider

Direct developer pricing and provider endpoint tariffs routed through OpenRouter are listed separately. Prices are in USD per 1M tokens. Context-dependent direct tiers plus regional, Flex, Priority, and other OpenRouter tariffs remain individually identifiable.

Provider pricing for Claude Opus 4.5 and Kimi K3
Model	Provider	Purchase route and tariff	Input per 1M tokens	Output per 1M tokens	Source
Claude Opus 4.5	Anthropic	Direct from developerStandard API	Lowest listed price: $5	Lowest listed price: $25	Source09/22/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/eu-west-1	$5.5	$27.5	Source10/26/2026
	Anthropic	Via OpenRouteranthropic	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Azure	Via OpenRouterazure/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Claude Platform on AWS	Via OpenRouterclaude-on-aws	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
	Google	Via OpenRoutergoogle-vertex/global	Lowest listed price: $5	Lowest listed price: $25	Source10/26/2026
Kimi K3	Moonshot AI	Direct from developerStandard API	$3	$15	Source09/22/2026
	AkashML	Via OpenRouterakashml/fp4	$1.2	$14	Source10/26/2026
	Alibaba	Via OpenRouteralibaba	$3.45	$17.25	Source10/26/2026
	Amazon Bedrock	Via OpenRouteramazon-bedrock/us-east-2	$3	$15	Source10/26/2026
	BaseTen	Via OpenRouterbaseten/fp8	$3	$15	Source10/26/2026
	Chutes	Via OpenRouterchutes/mxfp4	$1.85	$9.5	Source10/26/2026
	Decart	Via OpenRouterdecart/mxfp4	$1.65	$8.25	Source10/26/2026
	DeepInfra	Via OpenRouterdeepinfra/mxfp4	$2.85	$14.25	Source10/26/2026
	DigitalOcean	Via OpenRouterdigitalocean	$2.55	$12.95	Source10/26/2026
	Fireworks	Via OpenRouterfireworks	$3	$15	Source10/26/2026
	Fireworks	Via OpenRouterfireworks/fast	$4.5	$22.5	Source10/26/2026
	Fireworks	Via OpenRouterfireworks/us	$4.5	$22.5	Source10/26/2026
	InferenceNet	Via OpenRouterinference-net/fast	$0.5	$11.88	Source10/26/2026
	InferenceNet	Via OpenRouterinference-net/fp4	$0.239	$10.8	Source10/26/2026
	InferenceNet	Via OpenRouterinference-net/us	$0.239	$10.8	Source10/26/2026
	InferenceNet	Via OpenRouterinference-net/us/fast	$2.24	$14.519	Source10/26/2026
	Makora	Via OpenRoutermakora/fp4	$0.65	$15	Source10/26/2026
	Modal	Via OpenRoutermodal/mxfp4	$3	$15	Source10/26/2026
	Moonshot AI	Via OpenRoutermoonshotai/mxfp4	$3	$15	Source10/26/2026
	Morph	Via OpenRoutermorph/fp8	$1.17	$18.769	Source10/26/2026
	Parasail	Via OpenRouterparasail/fp4	$3	$15	Source10/26/2026
	ParetoAlpha	Via OpenRouterpareto-alpha/us	$3	$15	Source10/26/2026
	Phala	Via OpenRouterphala	$2.55	$12.75	Source10/26/2026
	Relace	Via OpenRouterrelace/fp4	Lowest listed price: $0.2147	$7.6972	Source10/26/2026
	Sail Research	Via OpenRoutersail-research/fp4	$1.2	Lowest listed price: $5.5	Source10/26/2026
	Sail Research	Via OpenRoutersail-research/fp4/us	$1.2	Lowest listed price: $5.5	Source10/26/2026
	Wafer	Via OpenRouterwafer	$0.226	$20	Source10/26/2026
	Wafer	Via OpenRouterwafer/us	$0.36	$11.9	Source10/26/2026

Benchmark index

Benchmark index compared

The index combines independent benchmarks on a scale from 0 to 100. A lead only counts when a model comes first in at least 95% of 200 recalculations with randomly redrawn test families. Otherwise both count as level.

Open the AI leaderboard

Claude Opus 4.5

Overall index

12.1

Kimi K3

Overall index

62.0

Kimi K3 leads in 9 of 9 shared areas.

Area	Claude Opus 4.5	Kimi K3
Coding	8.1	52.2
Reasoning	7.0	64.0
Knowledge	10.8	49.3
Agents	12.3	61.7
Finance	19.8	70.3
Legal	15.3	73.4
Health	19.6	68.9
Multimodal	10.4	56.3
Education	17.1	69.5

Performance

Shared benchmarks

Only published results with the same benchmark version, task, metric, and comparison cohort are paired. Different reasoning levels, agents, harnesses, or output limits appear directly in the table.

Capability profile from matched benchmarks

Each axis averages directly matched benchmark families. A value of 100 means the stronger value within this pair, not a universal quality score.

Not enough directly matched categories for a reliable radar

Only 0 of at least 5 categories have comparable, direct model measurements. The benchmark tables below show the available evidence without filling missing axes.

Claude Opus 4.5Kimi K3

CorpFin v2Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.561.305 %

Kimi K371.562 %

GPQA DiamondOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.579.546 %

Kimi K392.929 %

LegalBenchOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.582.837 %

Kimi K386.212 %

LiveCodeBench v6Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.575.034 %

Kimi K387.185 %

MedCodeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.545.174 %

Kimi K349.357 %

MedScribeOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.583.246 %

Kimi K388.048 %

MMLU-ProOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.585.59 %

Kimi K387.973 %

MMMU-ProOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.581.098 %

Kimi K388.15 %

MortgageTaxOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.568.68 %

Kimi K366.336 %

SAGEOverall. Higher is better. Test setup not documented as identical

Claude Opus 4.545.002 %

Kimi K352.783 %

TaxEval v2Overall. Higher is better. Test setup not documented as identical

Claude Opus 4.574.325 %

Kimi K375.716 %

CorpFin v2Exact Pages. Higher is better. Test setup not documented as identical

Claude Opus 4.560.839 %

Kimi K369.347 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for Claude Opus 4.5 and Kimi K3
Benchmark and task	Claude Opus 4.5	Kimi K3	Source
CorpFin v2Overall Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	61.305 %	Higher measured value71.562 %	Vals AI Source details Data as of: 08/12/2026
GPQA DiamondOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	79.546 %	Higher measured value92.929 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	82.837 %	Higher measured value86.212 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Overall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	75.034 %	Higher measured value87.185 %	Vals AI Source details Data as of: 09/01/2026
MedCodeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	45.174 %	Higher measured value49.357 %	Vals AI Source details Data as of: 10/13/2026
MedScribeOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	83.246 %	Higher measured value88.048 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	85.59 %	Higher measured value87.973 %	Vals AI Source details Data as of: 09/01/2026
MMMU-ProOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	81.098 %	Higher measured value88.15 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	Higher measured value68.68 %	66.336 %	Vals AI Source details Data as of: 09/01/2026
SAGEOverall Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	45.002 %	Higher measured value52.783 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Overall Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	74.325 %	Higher measured value75.716 %	Vals AI Source details Data as of: 09/01/2026
CorpFin v2Exact Pages Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	60.839 %	Higher measured value69.347 %	Vals AI Source details Data as of: 08/12/2026
GPQA DiamondFew-Shot CoT Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	79.293 %	Higher measured value93.434 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchConclusion Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	87.7 %	Higher measured value90.076 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Easy Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value99.068 %	98.758 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProBiology Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value94.003 %	93.863 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxNumerical Extraction Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	77.424 %	Higher measured value78.855 %	Vals AI Source details Data as of: 09/01/2026
SAGEAutomata Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	29.365 %	Higher measured value43.254 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Correctness Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	63.123 %	Higher measured value65.331 %	Vals AI Source details Data as of: 09/01/2026
CorpFin v2Max Fitting Context Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	60.723 %	Higher measured value72.727 %	Vals AI Source details Data as of: 08/12/2026
GPQA DiamondZero-Shot CoT Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	79.798 %	Higher measured value92.424 %	Vals AI Source details Data as of: 09/01/2026
LegalBenchInterpretation Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	82.235 %	Higher measured value84.092 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Hard Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	44.571 %	Higher measured value74.286 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProBusiness Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	80.862 %	Higher measured value92.015 %	Vals AI Source details Data as of: 09/01/2026
MortgageTaxSemantic Extraction Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	Higher measured value59.936 %	53.816 %	Vals AI Source details Data as of: 09/01/2026
SAGECalculus Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	58.333 %	Higher measured value79.938 %	Vals AI Source details Data as of: 10/08/2026
TaxEval v2Stepwise Reasoning Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	85.527 %	Higher measured value86.1 %	Vals AI Source details Data as of: 09/01/2026
CorpFin v2Shared Max Context Test details Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Temperature: 1, Output limit: 262,144 tokens	62.354 %	Higher measured value72.611 %	Vals AI Source details Data as of: 08/12/2026
LegalBenchIssue Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	84.152 %	Higher measured value90.911 %	Vals AI Source details Data as of: 10/13/2026
LiveCodeBench v6Medium Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	81.462 %	Higher measured value88.512 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProChemistry Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	89.488 %	Higher measured value91.784 %	Vals AI Source details Data as of: 09/01/2026
SAGELinear Algebra Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	64.372 %	Higher measured value72.238 %	Vals AI Source details Data as of: 10/08/2026
LegalBenchRhetoric Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	79.777 %	Higher measured value81.933 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProComputer Science Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	84.146 %	Higher measured value91.22 %	Vals AI Source details Data as of: 09/01/2026
SAGEPartial Differential Equations Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 30,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	41.27 %	Higher measured value42.857 %	Vals AI Source details Data as of: 10/08/2026
LegalBenchRule Tasks Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Temperature: 1, Top P: 0.95, Output limit: 262,144 tokens	80.32 %	Higher measured value84.05 %	Vals AI Source details Data as of: 10/13/2026
MMLU-ProEconomics Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	89.573 %	Higher measured value91.588 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProEngineering Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	76.161 %	Higher measured value86.894 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProHealth Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value83.985 %	82.029 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProHistory Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	78.478 %	Higher measured value79.265 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProLaw Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value78.292 %	77.021 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProMath Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	92.302 %	Higher measured value95.633 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProOthers Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value84.632 %	83.983 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPhilosophy Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value87.776 %	85.371 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPhysics Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	89.838 %	Higher measured value92.61 %	Vals AI Source details Data as of: 09/01/2026
MMLU-ProPsychology Test details Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Opus 4.5: Snapshot: claude-opus-4-5-20251101, Compute: high, Temperature: 1, Output limit: 64,000 tokens Kimi K3: Reasoning: max, Output limit: 262,144 tokens	Higher measured value88.722 %	88.346 %	Vals AI Source details Data as of: 09/01/2026
Key to the marks:better valuebetter, but not conclusivetie

Our model tests

Our tests

SVG short test

One SVG prompt and fixed output settings. Captures are shown only with 0 reported reasoning tokens or documented lack of reasoning controls. Identical test conditions do not make the models' internal compute identical.

Shared test round: 43b8c5c46830

Claude Opus 4.5

Unavailable in this round

Kimi K3

Earlier tests

Pelican on a bicycle

A community classic for free-form SVG drawing.

Claude Opus 4.5

Reasoning (requested): high

Current attempt

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: anthropic/claude-opus-4.5
API model reported in response: anthropic/claude-opus-4.5
Reasoning setting: high
Pinned endpoint: Anthropic | anthropic/claude-4.5-opus-20251124
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 21.6 s

Visually reviewed. This individual test does not establish overall model quality.

Kimi K3

Reasoning (requested): high

Current attempt

Run date: Oct 1, 2026
API provider: openrouter
Requested API model: moonshotai/kimi-k3
API model reported in response: moonshotai/kimi-k3
Reasoning setting: high
Pinned endpoint: Moonshot AI | moonshotai/kimi-k3-20260715
Temperature: Provider default
Token limit including reasoning: 8,192 tokens
Test protocol: community-visual-tests-v1
Technical checks: Passed, not a quality rating
Response time: 173.4 s

Visually reviewed. This individual test does not establish overall model quality.

Earlier attempts (1)

Sep 7, 2026API request failedReasoning setting: high

Prompt and test conditions

Generate an SVG of a pelican riding a bicycle

Token limit including reasoning: 8,192 tokens

Task origin (Simon Willison)

How to read this comparison

Winning one benchmark is not an overall verdict

Your workload, budget, and required context length matter most. A coding benchmark says little about visual understanding or agent performance.

The standard price table uses direct developer rates. The provider comparison labels OpenRouter endpoints, regions, and special tariffs separately.

Every result links to its measurement source and retrieval date. Labels distinguish vendor reports, official benchmark leaderboards, and independent evaluations. Disputed or archived results are excluded.

More matchups

Compare Claude Opus 4.5 and Kimi K3 with other leading models using the same data and benchmark logic.

View the complete LLM comparison

Claude Opus 4.5 vs. Kimi K3

Change model selection

General specifications

API pricing compared

Benchmark index compared

Shared benchmarks

Capability profile from matched benchmarks

Our tests

SVG short test

Claude Opus 4.5

Kimi K3

Pelican on a bicycle

Winning one benchmark is not an overall verdict

Related LLM comparisons