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Model comparison

Claude 3.5 Sonnet vs GPT-5.4

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.

47.74/100
Margin
26.5pts
winning →
GPT-5.4
OpenAI
74.24/100
1 category wins2 category wins

Public leaderboard positions: Claude 3.5 Sonnet #132 (Estimated); GPT-5.4 #8 (Supported). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude 3.5 Sonnet and GPT-5.4 share 3 comparable benchmark results. 3 of 8 categories are comparable. 1 result is unique to Claude 3.5 Sonnet; 49 to GPT-5.4.

Updated July 20, 2026
Shared results
3
Claude 3.5 Sonnet only
1
GPT-5.4 only
49
Comparable categories
3 / 8

Pick GPT-5.4 if you want the stronger benchmark profile. Claude 3.5 Sonnet only becomes the better choice if knowledge is the priority or you would rather avoid the extra latency and token burn of a reasoning model.

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

Why this result

GPT-5.4 is clearly ahead on the BenchAlign aggregate, 74.24 to 47.74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.4's sharpest advantage is in mathematics, where it averages 42.5 against 1.6. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 2.069% to 47.600%. Claude 3.5 Sonnet does hit back in knowledge, so the answer changes if that is the part of the workload you care about most.

GPT-5.4 is the reasoning model in the pair, while Claude 3.5 Sonnet 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. GPT-5.4 gives you the larger context window at 1.05M, compared with 200K for Claude 3.5 Sonnet.

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 3.5 Sonnet and GPT-5.4
CategoryClaude 3.5 SonnetΔGPT-5.4
MathClaude 3.5 Sonnet1.6Margin→ 40.9GPT-5.442.5
CodingClaude 3.5 Sonnet49.0Margin→ 8.7GPT-5.457.7
KnowledgeClaude 3.5 Sonnet59.4Margin← 1.8GPT-5.457.6
AgenticClaude 3.5 SonnetNot measuredMarginNo overlapGPT-5.477.2
MultimodalClaude 3.5 SonnetNot measuredMarginNo overlapGPT-5.473.2

Decisive benchmark drivers

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

More
A · Claude 3.5 SonnetB · GPT-5.4

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 2.069%B 47.600%
    Winner: GPT-5.4Δ 45.5
    FrontierMath v2 (Tiers 1-3): Claude 3.5 Sonnet scored 2.069%; GPT-5.4 scored 47.600%. GPT-5.4 wins this benchmark.

  2. GPQA

    Knowledge
    Source ↗
    A 59.4%B 92.8%
    Winner: GPT-5.4Δ 33.4
    GPQA: Claude 3.5 Sonnet scored 59.4%; GPT-5.4 scored 92.8%. GPT-5.4 wins this benchmark.

  3. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 0.000%B 27.100%
    Winner: GPT-5.4Δ 27.1
    FrontierMath v2 (Tier 4): Claude 3.5 Sonnet scored 0.000%; GPT-5.4 scored 27.100%. GPT-5.4 wins this benchmark.

Operational comparison

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

MetricClaude 3.5 SonnetGPT-5.4Comparison
Input / output priceUSD per 1M tokensClaude 3.5 Sonnet$3 input / $15 outputGPT-5.4$2.5 input / $15 outputGPT-5.4 has the lower combined listed price.
Generation speedtokens per secondClaude 3.5 SonnetNot availableGPT-5.474 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude 3.5 SonnetNot availableGPT-5.4151.79 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude 3.5 Sonnet200KGPT-5.41.05MGPT-5.4 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude 3.5 SonnetGPT-5.4Result
Terminal-Bench 2.0Source —75.1%Not comparable
CyberGymSource —79.0%Not comparable
BrowseCompSource —82.7%Not comparable
OSWorld-VerifiedSource —75%Not comparable
MCP AtlasSource —70.6%Not comparable
ToolathlonSource —54.6%Not comparable
τ²-bench resultsSource —87.1%Not comparable
Claw-EvalSource —60.3%Not comparable
DeepSearchQASource —73.6%Not comparable
AA Agentic IndexSource —41.1%Not comparable
APEX-Agents-AASource —33.3%Not comparable
GDPval-AASource —44.7%Not comparable
GDPval-AASource —1395Not comparable
Gert LabsSource —64.89%Not comparable
ResearchClawBenchSource —15.3%Not comparable
JobBenchSource —38.9%Not comparable
ExploitGymSource —6.0%Not comparable
CodingGPT-5.4 wins
BenchmarkClaude 3.5 SonnetGPT-5.4Result
SWE-bench VerifiedSource 49%—Not comparable
LiveCodeBench ProSource —87.5%Not comparable
SWE-bench ProSource —57.7%Not comparable
React Native EvalsSource —85.3%Not comparable
Vibe Code BenchSource —67.42%Not comparable
AA Coding IndexSource —71.0%Not comparable
AA-SciCodeSource —56.6%Not comparable
Reasoning
BenchmarkClaude 3.5 SonnetGPT-5.4Result
AA-LCRSource —74.0%Not comparable
CritPtSource —23.4%Not comparable
KnowledgeClaude 3.5 Sonnet wins
BenchmarkClaude 3.5 SonnetGPT-5.4Result
GPQASource 59.4%92.8%GPT-5.4 leads
HLESource —52.1%Not comparable
HLE w/o toolsSource —39.8%Not comparable
GPQA-DSource —92.8%Not comparable
HealthBench HardSource —40.1%Not comparable
MedXpertQA (Text)Source —59.6%Not comparable
Artificial Analysis Intelligence IndexSource —51.4%Not comparable
AA-GPQA DiamondSource —92.0%Not comparable
AA-HLESource —41.6%Not comparable
AA-Omniscience IndexSource —5.7%Not comparable
AA-Omniscience AccuracySource —50.0%Not comparable
AA-Omniscience Hallucination RateSource —88.6%Not comparable
HealthBench ProfessionalSource —48.1%Not comparable
MathGPT-5.4 wins
BenchmarkClaude 3.5 SonnetGPT-5.4Result
FrontierMath v2 (Tiers 1-3)Source 2.069%47.600%GPT-5.4 leads
FrontierMath v2 (Tier 4)Source 0.000%27.100%GPT-5.4 leads
Multimodal
BenchmarkClaude 3.5 SonnetGPT-5.4Result
MMMU-ProSource —81.2%Not comparable
OfficeQA ProSource —53.2%Not comparable
MMMU-Pro w/ PythonSource —82.1%Not comparable
CharXivSource —82.8%Not comparable
ERQASource —65.4%Not comparable
SimpleVQASource —61.1%Not comparable
ScreenSpot ProSource —85.4%Not comparable
ZeroBenchSource —41.0%Not comparable
MedXpertQA (MM)Source —77.1%Not comparable
AA-MMMU-ProSource —78.4%Not comparable
Design Arena WebsiteSource —1252Not comparable
Inst. Following
BenchmarkClaude 3.5 SonnetGPT-5.4Result
AA-IFBenchSource —73.9%Not comparable
Frequently Asked Questions (4)

Which is better, Claude 3.5 Sonnet or GPT-5.4?

GPT-5.4 is ahead on BenchLM's BenchAlign leaderboard, 74.24 to 47.74. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 2.069% and 47.600%.

Which is better for knowledge tasks, Claude 3.5 Sonnet or GPT-5.4?

Claude 3.5 Sonnet has the edge for knowledge tasks in this comparison, averaging 59.4 versus 57.6. Inside this category, GPQA is the benchmark that creates the most daylight between them.

Which is better for coding, Claude 3.5 Sonnet or GPT-5.4?

GPT-5.4 has the edge for coding in this comparison, averaging 57.7 versus 49. Claude 3.5 Sonnet stays close enough that the answer can still flip depending on your workload.

Which is better for math, Claude 3.5 Sonnet or GPT-5.4?

GPT-5.4 has the edge for math in this comparison, averaging 42.5 versus 1.6. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

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