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Model comparison

Claude Sonnet 4.5 vs Grok 4

Data verified

Head-to-head evidence from 3 shared benchmark results across 2 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

53.61/100
Margin
6.8pts
winning →
60.42/100
0 category wins1 category wins

Public leaderboard positions: Claude Sonnet 4.5 #96 (Estimated); Grok 4 #50 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Sonnet 4.5 and Grok 4 share 3 comparable benchmark results. 1 of 8 categories are comparable. 9 results are unique to Claude Sonnet 4.5; 13 to Grok 4.

Updated July 20, 2026
Shared results
3
Claude Sonnet 4.5 only
9
Grok 4 only
13
Comparable categories
1 / 8

Pick Grok 4 if you want the stronger benchmark profile. Claude Sonnet 4.5 only becomes the better choice if you need the larger 200K context window.

Confidence note. This is a partial-evidence comparison with 3 shared benchmark results across 2 evidence categories; 1 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Grok 4 is clearly ahead on the BenchAlign aggregate, 60.42 to 53.61. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Grok 4's sharpest advantage is in mathematics, where it averages 15.3 against 11.2. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 13.495% to 19.655%.

Claude Sonnet 4.5 gives you the larger context window at 200K, compared with 128K for Grok 4.

Category breakdown

Exact category averages are shown below. Not measured means BenchLM does not have enough sourced public coverage for that model and category.

Category scores and score margins for Claude Sonnet 4.5 and Grok 4
CategoryClaude Sonnet 4.5ΔGrok 4
MathClaude Sonnet 4.511.2Margin→ 4.1Grok 415.3
AgenticClaude Sonnet 4.555.4MarginNo overlapGrok 4Not measured
CodingClaude Sonnet 4.577.2MarginNo overlapGrok 4Not measured
ReasoningClaude Sonnet 4.513.6MarginNo overlapGrok 4Not measured
KnowledgeClaude Sonnet 4.583.4MarginNo overlapGrok 4Not measured

Decisive benchmark drivers

The largest measured benchmark gaps in this matchup, with exact reported values.

More
A · Claude Sonnet 4.5B · Grok 4

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 13.495%B 19.655%
    Winner: Grok 4Δ 6.2
    FrontierMath v2 (Tiers 1-3): Claude Sonnet 4.5 scored 13.495%; Grok 4 scored 19.655%. Grok 4 wins this benchmark.

  2. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 4.167%B 2.083%
    Winner: Claude Sonnet 4.5Δ 2.1
    FrontierMath v2 (Tier 4): Claude Sonnet 4.5 scored 4.167%; Grok 4 scored 2.083%. Claude Sonnet 4.5 wins this benchmark.

Operational comparison

Runtime and commercial metrics are compared only when both models have a complete sourced value.

MetricClaude Sonnet 4.5Grok 4Comparison
Input / output priceUSD per 1M tokensClaude Sonnet 4.5$3 input / $15 outputGrok 4Not availableA complete price comparison is not available.
Generation speedtokens per secondClaude Sonnet 4.5Not availableGrok 454 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Sonnet 4.5Not availableGrok 415.60 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Sonnet 4.5200KGrok 4128KClaude Sonnet 4.5 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude Sonnet 4.5Grok 4Result
Terminal-Bench 2.0Source 50%—Not comparable
OSWorld-VerifiedSource 61.4%—Not comparable
VITA-BenchSource 17.0%—Not comparable
Gert LabsSource 48.51%42.34%Claude Sonnet 4.5 leads
JobBenchSource 27.7%—Not comparable
τ²-bench resultsSource —74.9%Not comparable
Coding
BenchmarkClaude Sonnet 4.5Grok 4Result
SWE-bench VerifiedSource 77.2%—Not comparable
React Native EvalsSource —72.6%Not comparable
AA-SciCodeSource —45.7%Not comparable
Reasoning
BenchmarkClaude Sonnet 4.5Grok 4Result
ARC-AGI-2Source 13.6%—Not comparable
AA-LCRSource —68.0%Not comparable
CritPtSource —2.0%Not comparable
Knowledge
BenchmarkClaude Sonnet 4.5Grok 4Result
GPQASource 83.4%—Not comparable
Artificial Analysis Intelligence IndexSource —33.3%Not comparable
AA-GPQA DiamondSource —87.7%Not comparable
AA-HLESource —23.9%Not comparable
AA-Omniscience IndexSource —3.8%Not comparable
AA-Omniscience AccuracySource —41.4%Not comparable
AA-Omniscience Hallucination RateSource —64.2%Not comparable
MathGrok 4 wins
BenchmarkClaude Sonnet 4.5Grok 4Result
AIME 2025Source 87%—Not comparable
FrontierMath v2 (Tiers 1-3)Source 13.495%19.655%Grok 4 leads
FrontierMath v2 (Tier 4)Source 4.167%2.083%Claude Sonnet 4.5 leads
Multimodal
BenchmarkClaude Sonnet 4.5Grok 4Result
Design Arena WebsiteSource 1222—Not comparable
AA-MMMU-ProSource —68.8%Not comparable
Inst. Following
BenchmarkClaude Sonnet 4.5Grok 4Result
AA-IFBenchSource —53.7%Not comparable
Frequently Asked Questions (2)

Which is better, Claude Sonnet 4.5 or Grok 4?

Grok 4 is ahead on BenchLM's BenchAlign leaderboard, 60.42 to 53.61. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 13.495% and 19.655%.

Which is better for math, Claude Sonnet 4.5 or Grok 4?

Grok 4 has the edge for math in this comparison, averaging 15.3 versus 11.2. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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