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Head-to-head comparison

Claude Sonnet 5 vs. Grok 4.3

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

shared result series
199
distinct benchmarks
25
latest retrieval
2026-09-04

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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 Sonnet 5 and Grok 4.3
AttributeClaude Sonnet 5Grok 4.3
ProviderAnthropicxAI
ReleasedJun 30, 2026May 6, 2026
AvailabilityActiveActive
Model typeProprietaryProprietary
ParametersNot publishedNot published
ArchitectureNot publishedNot published
Context window1,000,000 tokens1,000,000 tokens
Knowledge cutoffJanuary 2026Not published
Technical sourcesModel, ContextModel

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 Sonnet 5 and Grok 4.3
Price typeClaude Sonnet 5Grok 4.3
API input$2$1.25 ≤200K / $2.5 >200K
API output$10$2.5 ≤200K / $5 >200K
Cache read$0.2$0.2 ≤200K / $0.4 >200K
Cache write (5 min.)$2.5Not listed
Cache write (1 hr.)$4Not listed
Price verified09/02/2026 Source08/11/2026 Source
Claude Sonnet 5Grok 4.3
API inputUSD per 1M tokens, base tier
Claude Sonnet 5$2
Grok 4.3Lower price$1.25
API outputUSD per 1M tokens, base tier
Claude Sonnet 5$10
Grok 4.3Lower price$2.5
Cache readUSD per 1M tokens, base tier
Claude Sonnet 5Tie$0.2
Grok 4.3Tie$0.2

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 Sonnet 5 and Grok 4.3
ModelProviderPurchase route and tariffInput per 1M tokensOutput per 1M tokensSource
Claude Sonnet 5AnthropicDirect from developerStandard APILowest listed price: $2Lowest listed price: $10Source09/02/2026
Amazon BedrockVia OpenRouteramazon-bedrock/globalLowest listed price: $2Lowest listed price: $10Source09/07/2026
Amazon BedrockVia OpenRouteramazon-bedrock/us-east-1$2.2$11Source09/07/2026
AnthropicVia OpenRouteranthropicLowest listed price: $2Lowest listed price: $10Source09/07/2026
AzureVia OpenRouterazure/globalLowest listed price: $2Lowest listed price: $10Source09/07/2026
AzureVia OpenRouterazure/usLowest listed price: $2Lowest listed price: $10Source09/07/2026
Claude Platform on AWSVia OpenRouterclaude-on-awsLowest listed price: $2Lowest listed price: $10Source09/07/2026
GoogleVia OpenRoutergoogle-vertex/europe$2.2$11Source09/07/2026
GoogleVia OpenRoutergoogle-vertex/globalLowest listed price: $2Lowest listed price: $10Source09/07/2026
GoogleVia OpenRoutergoogle-vertex/us$2.2$11Source09/07/2026
Grok 4.3xAIDirect from developerUp to 200,000 context tokensLowest listed price: $1.25Lowest listed price: $2.5Source08/11/2026
xAIDirect from developerAbove 200,000 context tokens$2.5$5Source08/11/2026
xAIVia OpenRouterxaiLowest listed price: $1.25Lowest listed price: $2.5Source09/07/2026
xAIVia OpenRouterxai/priority$2.5$5Source09/07/2026
xAIVia OpenRouterxai/zdrLowest listed price: $1.25Lowest listed price: $2.5Source09/07/2026
xAIVia OpenRouterxai/zdr/priority$2.5$5Source09/07/2026

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.

255075100CodingReasoningKnowledgeFinanceLegalAgentic tasksMultimodalProductivity
Claude Sonnet 5
Grok 4.3
Coding: 99.5 / 65.8 (5 benchmark families)
Reasoning: 97.2 / 100 (1 benchmark family)
Knowledge: 100 / 98.1 (1 benchmark family)
Finance: 99.5 / 72 (5 benchmark families)
Legal: 99.8 / 48.4 (3 benchmark families)
Agentic tasks: 100 / 71.9 (2 benchmark families)
Multimodal: 99.9 / 100 (1 benchmark family)
Productivity: 100 / 78.3 (1 benchmark family)

26 matched rows from 24 benchmark families were considered. The radar shows 8 of 11 comparable categories.

Claude Sonnet 5Grok 4.3
Code MigrationOverall. Higher is better. No documented setup difference
Claude Sonnet 5Winner44.392 %
Grok 4.36.795 %
CorpFin v2Overall. Higher is better. No documented setup difference
Claude Sonnet 566.977 %
Grok 4.3Winner68.532 %
EMBOverall. Higher is better. No documented setup difference
Claude Sonnet 5Winner66.316 %
Grok 4.318.394 %
Finance Agent (v2)Overall. Higher is better. No documented setup difference
Claude Sonnet 5Winner53.909 %
Grok 4.337.728 %
GPQA DiamondOverall. Higher is better. No documented setup difference
Claude Sonnet 588.889 %
Grok 4.3Winner91.414 %
Harvey's Legal Agent BenchmarkOverall · Task fully resolved. Higher is better. No documented setup difference
Claude Sonnet 5Winner5 %
Grok 4.30.417 %
Legal Research BenchOverall · All-pass. Higher is better. No documented setup difference
Claude Sonnet 5Winner41.827 %
Grok 4.315.385 %
LegalBenchOverall. Higher is better. No documented setup difference
Claude Sonnet 583.922 %
Grok 4.3Winner84.458 %
LiveCodeBench v6Overall. Higher is better. No documented setup difference
Claude Sonnet 582.429 %
Grok 4.3Winner84.494 %
LMArena Text, Style ControlOverall. Higher is better. Test setup not documented as identical
Claude Sonnet 5Higher measured value1,462.16
Grok 4.31,442.599
MedCodeOverall. Higher is better. No documented setup difference
Claude Sonnet 5Winner47.54 %
Grok 4.338.068 %
MedScribeOverall. Higher is better. No documented setup difference
Claude Sonnet 5Winner76.054 %
Grok 4.374.399 %

Key to the marks:better valuebetter, but not conclusivetie

Benchmark scores for Claude Sonnet 5 and Grok 4.3
Benchmark and taskClaude Sonnet 5Grok 4.3Source
Code MigrationOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner44.392 %
6.795 %
Vals AI
Source details
Data as of: 09/03/2026
CorpFin v2Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
66.977 %
Winner68.532 %
Vals AI
Source details
Data as of: 08/12/2026
EMBOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner66.316 %
18.394 %
Vals AI
Source details
Data as of: 09/03/2026
Finance Agent (v2)Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner53.909 %
37.728 %
Vals AI
Source details
Data as of: 09/03/2026
GPQA DiamondOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
88.889 %
Winner91.414 %
Vals AI
Source details
Data as of: 09/01/2026
Harvey's Legal Agent BenchmarkOverall · Task fully resolved
Test details
No documented difference in the test setupVersion: 1Metric: task resolution rateScoring: Higher is better
Winner5 %
0.417 %
Vals AI
Source details
Data as of: 09/03/2026
Legal Research BenchOverall · All-pass
Test details
No documented difference in the test setupVersion: 1Metric: all-pass rateScoring: Higher is better
Winner41.827 %
15.385 %
Vals AI
Source details
Data as of: 09/03/2026
LegalBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
83.922 %
Winner84.458 %
Vals AI
Source details
Data as of: 09/01/2026
LiveCodeBench v6Overall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
82.429 %
Winner84.494 %
Vals AI
Source details
Data as of: 09/01/2026
LMArena Text, Style ControlOverall
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Sonnet 5: Snapshot: claude-sonnet-5-high, Reasoning: high, Harness: Arena text, style control
Grok 4.3: Snapshot: grok-4.3, Harness: Arena text, style controlClaude Sonnet 5: Style-controlled Arena rating from 31,096 anonymous pairwise votes.Grok 4.3: Style-controlled Arena rating from 65,024 anonymous pairwise votes.
Higher measured value1,462.16
95% confidence interval: ±4.745The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,442.599
95% confidence interval: ±3.771The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.		LMArena
Source details
Data as of: 09/01/2026
MedCodeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner47.54 %
38.068 %
Vals AI
Source details
Data as of: 09/03/2026
MedScribeOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner76.054 %
74.399 %
Vals AI
Source details
Data as of: 09/03/2026
MMLU-ProOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner87.545 %
85.838 %
Vals AI
Source details
Data as of: 09/01/2026
MMMU-ProOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
83.006 %
Winner83.064 %
Vals AI
Source details
Data as of: 09/01/2026
MortgageTaxOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner70.032 %
48.252 %
Vals AI
Source details
Data as of: 09/01/2026
ProgramBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Tie0 %
Tie0 %
Vals AI
Source details
Data as of: 09/01/2026
Public Benefits Bench v1.1Overall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is better
Winner66.035 %
51.691 %
Vals AI
Source details
Data as of: 09/01/2026
SAGEOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner48.925 %
19.736 %
Vals AI
Source details
Data as of: 09/03/2026
SkillsBenchOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands
Winner46.476 %
40.638 %
Vals AI
Source details
Data as of: 09/01/2026
SWE-bench VerifiedOverall
Test details
No documented difference in the test setupVersion: 1Metric: accuracyScoring: Higher is better
Winner79.6 %
71.4 %
Vals AI
Source details
Data as of: 09/01/2026
TaxEval v2Overall
Test details
No documented difference in the test setupVersion: 2Metric: accuracyScoring: Higher is better
Winner75.634 %
70.81 %
Vals AI
Source details
Data as of: 09/01/2026
Terminal-Bench 2.1Overall
Test details
No documented difference in the test setupVersion: 2.1Metric: accuracyScoring: Higher is better
Winner74.532 %
41.948 %
Vals AI
Source details
Data as of: 09/03/2026
Vals IndexOverall
Test details
No documented difference in the test setupVersion: 2Metric: weighted index scoreScoring: Higher is better
Winner59.61 %
24.294 %
Vals AI
Source details
Data as of: 09/03/2026
Vals Multimodal IndexOverall
Test details
No documented difference in the test setupVersion: 1.2Metric: weighted index scoreScoring: Higher is better
Winner68.826 %
43.293 %
Vals AI
Source details
Data as of: 08/11/2026
Vibe Code Bench v1.1Overall
Test details
No documented difference in the test setupVersion: 1.1Metric: accuracyScoring: Higher is betterSettings: Harness: OpenHands
Winner81.325 %
19.403 %
Vals AI
Source details
Data as of: 09/03/2026
Code MigrationCLI
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value36.332 %
9.06 %
Vals AI
Source details
Data as of: 08/09/2026
CorpFin v2Exact Pages
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
63.869 %
Higher measured value66.783 %
Vals AI
Source details
Data as of: 08/06/2026
EMBComps
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value69.384 %
16.558 %
Vals AI
Source details
Data as of: 08/06/2026
Finance Agent (v2)Adjustments
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value48.715 %
31.863 %
Vals AI
Source details
Data as of: 08/06/2026
GPQA DiamondFew-Shot CoT
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
87.374 %
Higher measured value92.929 %
Vals AI
Source details
Data as of: 08/09/2026
Harvey's Legal Agent BenchmarkAntitrust Competition · Criteria passed
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: criteria pass rateScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value88.768 %
61.594 %
Vals AI
Source details
Data as of: 08/07/2026
Legal Research BenchAdministrative / Regulatory · All-pass
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: all-pass rateScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value54.545 %
25.758 %
Vals AI
Source details
Data as of: 08/06/2026
LegalBenchConclusion Tasks
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
89.555 %
Higher measured value89.912 %
Vals AI
Source details
Data as of: 08/09/2026
LiveCodeBench v6Easy
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
No direct winner98.447 %
No direct winner98.447 %
Vals AI
Source details
Data as of: 08/09/2026
LMArena Text, Style ControlBusiness, management and finance
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Sonnet 5: Snapshot: claude-sonnet-5-high, Reasoning: high, Harness: Arena text, style control
Grok 4.3: Snapshot: grok-4.3, Harness: Arena text, style controlClaude Sonnet 5: Style-controlled Arena rating from 6,214 anonymous pairwise votes.Grok 4.3: Style-controlled Arena rating from 13,131 anonymous pairwise votes.
Higher measured value1,462.981
95% confidence interval: ±8.229The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,439.103
95% confidence interval: ±6.526The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.		LMArena
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 Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value93.584 %
93.305 %
Vals AI
Source details
Data as of: 08/09/2026
MortgageTaxNumerical Extraction
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95, Output limit: 256,000 tokens
Higher measured value78.696 %
37.52 %
Vals AI
Source details
Data as of: 08/09/2026
ProgramBenchAlmost Resolved
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value13.5 %
0 %
Vals AI
Source details
Data as of: 08/09/2026
SAGEAutomata
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 30,000 tokens
Grok 4.3: Temperature: 1, Top P: 0.95, Output limit: 30,000 tokens
34.92 %
Higher measured value35.318 %
Vals AI
Source details
Data as of: 08/09/2026
SkillsBenchNo Skills
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Harness: OpenHands, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Harness: OpenHands, Temperature: 0.7, Top P: 0.95
Higher measured value35.123 %
19.305 %
Vals AI
Source details
Data as of: 08/07/2026
SWE-bench Verified<15 min fix
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
No direct winner83.505 %
No direct winner83.505 %
Vals AI
Source details
Data as of: 08/08/2026
TaxEval v2Correctness
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value64.023 %
60.589 %
Vals AI
Source details
Data as of: 08/09/2026
Terminal-Bench 2.1Easy
Test details
Test setup not documented as identicalNo direct winnerVersion: 2.1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value100 %
75 %
Vals AI
Source details
Data as of: 08/06/2026
Vals IndexCorpFin v2
Test details
Test setup not documented as identicalNo direct winnerVersion: 1.2Metric: benchmark scoreScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
67.949 %
Higher measured value70.047 %
Vals AI
Source details
Data as of: 08/09/2026
Vals Multimodal IndexCorpFin v2
Test details
Test setup not documented as identicalNo direct winnerVersion: 1.2Metric: benchmark scoreScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
67.949 %
Higher measured value70.047 %
Vals AI
Source details
Data as of: 08/09/2026
Code MigrationCOBOL
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value68.571 %
0 %
Vals AI
Source details
Data as of: 08/09/2026
CorpFin v2Max Fitting Context
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value69.114 %
68.765 %
Vals AI
Source details
Data as of: 08/06/2026
EMBDataroom
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value84.909 %
29.176 %
Vals AI
Source details
Data as of: 08/06/2026
Finance Agent (v2)All-Pass
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value42.084 %
26.373 %
Vals AI
Source details
Data as of: 08/06/2026
GPQA DiamondZero-Shot CoT
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value90.404 %
89.899 %
Vals AI
Source details
Data as of: 08/09/2026
Harvey's Legal Agent BenchmarkAntitrust Competition · Task fully resolved
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: task resolution rateScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
No direct winner0 %
No direct winner0 %
Vals AI
Source details
Data as of: 08/07/2026
Legal Research BenchAdministrative / Regulatory · Weighted partial credit
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: weighted partial-credit scoreScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value87.81 %
73.866 %
Vals AI
Source details
Data as of: 08/06/2026
LegalBenchInterpretation Tasks
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
81.412 %
Higher measured value81.805 %
Vals AI
Source details
Data as of: 08/09/2026
LiveCodeBench v6Hard
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value66.857 %
66 %
Vals AI
Source details
Data as of: 08/09/2026
LMArena Text, Style ControlChinese
Test details
Test setup not documented as identicalNo direct winnerVersion: style-control-v1Metric: style-controlled Bradley-Terry ratingScoring: Higher is betterClaude Sonnet 5: Snapshot: claude-sonnet-5-high, Reasoning: high, Harness: Arena text, style control
Grok 4.3: Snapshot: grok-4.3, Harness: Arena text, style controlClaude Sonnet 5: Style-controlled Arena rating from 2,074 anonymous pairwise votes.Grok 4.3: Style-controlled Arena rating from 3,641 anonymous pairwise votes.
Higher measured value1,499.492
95% confidence interval: ±13.64The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.
1,479.363
95% confidence interval: ±10.781The Arena score measures human preference rather than a fixed capability test. The confidence interval and model configuration are part of the result.		LMArena
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 Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
91.635 %
Higher measured value92.902 %
Vals AI
Source details
Data as of: 08/09/2026
MortgageTaxSemantic Extraction
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95, Output limit: 256,000 tokens
Higher measured value61.367 %
58.983 %
Vals AI
Source details
Data as of: 08/09/2026
ProgramBenchFully Resolved
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
No direct winner0 %
No direct winner0 %
Vals AI
Source details
Data as of: 08/09/2026
SAGELinear Algebra
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 30,000 tokens
Grok 4.3: Temperature: 1, Top P: 0.95, Output limit: 30,000 tokens
Higher measured value68.999 %
18.334 %
Vals AI
Source details
Data as of: 08/09/2026
SkillsBenchWith Skills
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Harness: OpenHands, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Harness: OpenHands, Temperature: 0.7, Top P: 0.95
Higher measured value46.476 %
40.638 %
Vals AI
Source details
Data as of: 08/07/2026
SWE-bench Verified>4 hours
Test details
Test setup not documented as identicalNo direct winnerVersion: 1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value66.667 %
33.333 %
Vals AI
Source details
Data as of: 08/08/2026
TaxEval v2Stepwise Reasoning
Test details
Test setup not documented as identicalNo direct winnerVersion: 2Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Temperature: 0.7, Top P: 0.95
Higher measured value87.244 %
81.03 %
Vals AI
Source details
Data as of: 08/09/2026
Terminal-Bench 2.1Hard
Test details
Test setup not documented as identicalNo direct winnerVersion: 2.1Metric: accuracyScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value57.778 %
14.444 %
Vals AI
Source details
Data as of: 08/06/2026
Vals IndexFinance Agent v2
Test details
Test setup not documented as identicalNo direct winnerVersion: 1.2Metric: benchmark scoreScoring: Higher is betterClaude Sonnet 5: Compute: max, Temperature: 1, Output limit: 128,000 tokens
Grok 4.3: Reasoning: high, Temperature: 0.7, Top P: 0.95
Higher measured value51.979 %
37.766 %
Vals AI
Source details
Data as of: 08/09/2026

Key to the marks:better valuebetter, but not conclusivetie

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.

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