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Model comparison

Claude Sonnet 5 vs Gemini 2.5 Pro

Data verified

Head-to-head evidence from 17 shared benchmark results across 5 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

65.32/100
Margin
8.1pts
← winning
57.25/100
2 category wins0 category wins

Public leaderboard positions: Claude Sonnet 5 #29 (Estimated); Gemini 2.5 Pro #70 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude Sonnet 5 and Gemini 2.5 Pro share 17 comparable benchmark results. 2 of 8 categories are comparable. 19 results are unique to Claude Sonnet 5; 7 to Gemini 2.5 Pro.

Updated July 23, 2026
Shared results
17
Claude Sonnet 5 only
19
Gemini 2.5 Pro only
7
Comparable categories
2 / 8

Pick Claude Sonnet 5 if you want the stronger benchmark profile. Gemini 2.5 Pro only becomes the better choice if you would rather avoid the extra latency and token burn of a reasoning model.

Confidence note. This is a partial-evidence comparison with 17 shared benchmark results across 5 evidence categories; 2 of 8 categories currently have scoreable aggregates for both models. Treat the verdict as directional until coverage is more balanced.

Why this result

Claude Sonnet 5 is clearly ahead on the BenchAlign aggregate, 65.32 to 57.25. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

Claude Sonnet 5's sharpest advantage is in knowledge, where it averages 57.4 against 27.4. The single biggest benchmark swing on the page is HLE, 57.4% to 18.8%.

Claude Sonnet 5 is the reasoning model in the pair, while Gemini 2.5 Pro is not. That usually helps on harder chain-of-thought-heavy tests, but it can also mean more latency and more token spend in real use.

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 5 and Gemini 2.5 Pro
CategoryClaude Sonnet 5ΔGemini 2.5 Pro
KnowledgeClaude Sonnet 557.4Margin← 30.0Gemini 2.5 Pro27.4
CodingClaude Sonnet 576.7Margin← 12.9Gemini 2.5 Pro63.8
AgenticClaude Sonnet 581.9MarginNo overlapGemini 2.5 ProNot measured
MathClaude Sonnet 5Not measuredMarginNo overlapGemini 2.5 Pro11.6
MultimodalClaude Sonnet 588.3MarginNo overlapGemini 2.5 ProNot measured

Decisive benchmark drivers

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

More
A · Claude Sonnet 5B · Gemini 2.5 Pro

  1. HLE

    Knowledge
    Source ↗
    A 57.4%B 18.8%
    Winner: Claude Sonnet 5Δ 38.6
    HLE: Claude Sonnet 5 scored 57.4%; Gemini 2.5 Pro scored 18.8%. Claude Sonnet 5 wins this benchmark.

  2. SWE-bench Verified

    Coding
    Source ↗
    A 85.2%B 63.8%
    Winner: Claude Sonnet 5Δ 21.4
    SWE-bench Verified: Claude Sonnet 5 scored 85.2%; Gemini 2.5 Pro scored 63.8%. Claude Sonnet 5 wins this benchmark.

Operational comparison

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

MetricClaude Sonnet 5Gemini 2.5 ProComparison
Input / output priceUSD per 1M tokensClaude Sonnet 5$2 input / $10 outputGemini 2.5 Pro$1.25 input / $10 outputGemini 2.5 Pro has the lower combined listed price.
Generation speedtokens per secondClaude Sonnet 5Not availableGemini 2.5 Pro117 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude Sonnet 5Not availableGemini 2.5 Pro21.19 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude Sonnet 51MGemini 2.5 Pro1MListed context windows are equal.

Benchmark Deep Dive

Agentic
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
Terminal-Bench 2.0Source 80.4%—Not comparable
BrowseCompSource 84.7%—Not comparable
HLE w/ toolsSource 57.4%—Not comparable
OSWorld-VerifiedSource 81.2%—Not comparable
GDPval-AASource 1607665Claude Sonnet 5 leads
AA Agentic IndexSource 46.7%7.1%Claude Sonnet 5 leads
GDPval-AASource 55.4%8.3%Claude Sonnet 5 leads
AA BriefcaseSource 1388—Not comparable
AA AutomationBenchSource 39.2%—Not comparable
AA EnterpriseOps-GymSource 44.7%—Not comparable
AA Harvey LABSource 90.1%—Not comparable
AA Tau3 BankingSource 28.2%—Not comparable
aaTerminalBench21Source 80.5%—Not comparable
τ²-bench resultsSource —54.1%Not comparable
Gert LabsSource —42.01%Not comparable
CodingClaude Sonnet 5 wins
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
SWE-bench VerifiedSource 85.2%63.8%Claude Sonnet 5 leads
SWE-bench ProSource 63.2%—Not comparable
SWE MultilingualSource 78.3%—Not comparable
SWE MultimodalSource 28.1%—Not comparable
Terminal-Bench 2.0Source 80.4%—Not comparable
FrontierCode 1.1 MainSource 42.7%—Not comparable
cursorBench32Source 61.5%—Not comparable
AA Coding IndexSource 71.5%33.3%Claude Sonnet 5 leads
AA-SciCodeSource 53.6%42.8%Claude Sonnet 5 leads
Vibe Code BenchSource —0.40%Not comparable
Reasoning
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
AA-LCRSource 70.7%66.0%Claude Sonnet 5 leads
CritPtSource 16.9%2.6%Claude Sonnet 5 leads
KnowledgeClaude Sonnet 5 wins
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
HLESource 57.4%18.8%Claude Sonnet 5 leads
HLE w/o toolsSource 43.2%—Not comparable
Artificial Analysis Intelligence IndexSource 53.4%25.8%Claude Sonnet 5 leads
AA-GPQA DiamondSource 91.1%84.4%Claude Sonnet 5 leads
AA-HLESource 39.6%21.1%Claude Sonnet 5 leads
AA-Omniscience IndexSource 15.3%-14.3%Claude Sonnet 5 leads
AA-Omniscience AccuracySource 38.3%39.0%Gemini 2.5 Pro leads
AA-Omniscience Hallucination RateSource 37.3%87.4%Claude Sonnet 5 leads
GPQASource —83%Not comparable
Math
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
FrontierMath v2 (Tiers 1-3)Source —14.138%Not comparable
FrontierMath v2 (Tier 4)Source —4.167%Not comparable
Multimodal
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
CharXivSource 88.3%—Not comparable
CharXiv w/o toolsSource 77%—Not comparable
AA-MMMU-ProSource 77.3%74.9%Claude Sonnet 5 leads
Design Arena WebsiteSource 13141197Claude Sonnet 5 leads
Inst. Following
BenchmarkClaude Sonnet 5Gemini 2.5 ProResult
AA-IFBenchSource —48.7%Not comparable
Frequently Asked Questions (3)

Which is better, Claude Sonnet 5 or Gemini 2.5 Pro?

Claude Sonnet 5 is ahead on BenchLM's BenchAlign leaderboard, 65.32 to 57.25. The biggest single separator in this matchup is HLE, where the scores are 57.4% and 18.8%.

Which is better for knowledge tasks, Claude Sonnet 5 or Gemini 2.5 Pro?

Claude Sonnet 5 has the edge for knowledge tasks in this comparison, averaging 57.4 versus 27.4. Inside this category, AA-Omniscience Hallucination Rate is the benchmark that creates the most daylight between them.

Which is better for coding, Claude Sonnet 5 or Gemini 2.5 Pro?

Claude Sonnet 5 has the edge for coding in this comparison, averaging 76.7 versus 63.8. Inside this category, AA Coding Index is the benchmark that creates the most daylight between them.

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