Skip to main content
BenchLM
Advertise

Model comparison

Claude 3.5 Sonnet vs GPT-5.2

Data verified

Head-to-head evidence from 4 shared benchmark results across 3 categories. Overall scores shown here use the public BenchAlign v5 ranking lane.

47.74/100
Margin
10.7pts
winning →
GPT-5.2
OpenAI
58.43/100
0 category wins3 category wins

Public leaderboard positions: Claude 3.5 Sonnet #132 (Estimated); GPT-5.2 #64 (Estimated). Intervals and evidence labels describe ranking uncertainty, not a guarantee for a specific workload.

Evidence parity. Claude 3.5 Sonnet and GPT-5.2 share 4 comparable benchmark results. 3 of 8 categories are comparable. 0 results are unique to Claude 3.5 Sonnet; 24 to GPT-5.2.

Updated July 20, 2026
Shared results
4
Claude 3.5 Sonnet only
0
GPT-5.2 only
24
Comparable categories
3 / 8

Pick GPT-5.2 if you want the stronger benchmark profile. Claude 3.5 Sonnet 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 4 shared benchmark results across 3 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-5.2 is clearly ahead on the BenchAlign aggregate, 58.43 to 47.74. The gap is large enough that you do not need to squint at the spreadsheet to see the difference.

GPT-5.2's sharpest advantage is in mathematics, where it averages 35.2 against 1.6. The single biggest benchmark swing on the page is FrontierMath v2 (Tiers 1-3), 2.069% to 40.700%.

Claude 3.5 Sonnet is also the more expensive model on tokens at $3.00 input / $15.00 output per 1M tokens, versus $1.75 input / $14.00 output per 1M tokens for GPT-5.2. GPT-5.2 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-5.2 gives you the larger context window at 400K, 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-5.2
CategoryClaude 3.5 SonnetΔGPT-5.2
MathClaude 3.5 Sonnet1.6Margin→ 33.6GPT-5.235.2
KnowledgeClaude 3.5 Sonnet59.4Margin→ 33.0GPT-5.292.4
CodingClaude 3.5 Sonnet49.0Margin→ 21.6GPT-5.270.6
AgenticClaude 3.5 SonnetNot measuredMarginNo overlapGPT-5.255.7
ReasoningClaude 3.5 SonnetNot measuredMarginNo overlapGPT-5.252.9
MultimodalClaude 3.5 SonnetNot measuredMarginNo overlapGPT-5.280.4

Decisive benchmark drivers

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

More
A · Claude 3.5 SonnetB · GPT-5.2

  1. FrontierMath v2 (Tiers 1-3)

    Math
    Source ↗
    A 2.069%B 40.700%
    Winner: GPT-5.2Δ 38.6
    FrontierMath v2 (Tiers 1-3): Claude 3.5 Sonnet scored 2.069%; GPT-5.2 scored 40.700%. GPT-5.2 wins this benchmark.

  2. GPQA

    Knowledge
    Source ↗
    A 59.4%B 92.4%
    Winner: GPT-5.2Δ 33
    GPQA: Claude 3.5 Sonnet scored 59.4%; GPT-5.2 scored 92.4%. GPT-5.2 wins this benchmark.

  3. SWE-bench Verified

    Coding
    Source ↗
    A 49%B 80%
    Winner: GPT-5.2Δ 31
    SWE-bench Verified: Claude 3.5 Sonnet scored 49%; GPT-5.2 scored 80%. GPT-5.2 wins this benchmark.

  4. FrontierMath v2 (Tier 4)

    Math
    Source ↗
    A 0.000%B 18.800%
    Winner: GPT-5.2Δ 18.8
    FrontierMath v2 (Tier 4): Claude 3.5 Sonnet scored 0.000%; GPT-5.2 scored 18.800%. GPT-5.2 wins this benchmark.

Operational comparison

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

MetricClaude 3.5 SonnetGPT-5.2Comparison
Input / output priceUSD per 1M tokensClaude 3.5 Sonnet$3 input / $15 outputGPT-5.2$1.75 input / $14 outputGPT-5.2 has the lower combined listed price.
Generation speedtokens per secondClaude 3.5 SonnetNot availableGPT-5.273 tok/sA complete speed comparison is not available.
First-answer latencyseconds to first tokenClaude 3.5 SonnetNot availableGPT-5.2130.34 sA complete latency comparison is not available.
Context windowmaximum listed tokensClaude 3.5 Sonnet200KGPT-5.2400KGPT-5.2 lists the larger context window.

Benchmark Deep Dive

Agentic
BenchmarkClaude 3.5 SonnetGPT-5.2Result
BrowseCompSource —65.8%Not comparable
OSWorld-VerifiedSource —47.3%Not comparable
τ²-bench resultsSource —84.8%Not comparable
Gert LabsSource —46.54%Not comparable
JobBenchSource —34.3%Not comparable
CodingGPT-5.2 wins
BenchmarkClaude 3.5 SonnetGPT-5.2Result
SWE-bench VerifiedSource 49%80%GPT-5.2 leads
SWE-bench ProSource —55.6%Not comparable
Vibe Code BenchSource —53.50%Not comparable
AA-SciCodeSource —52.1%Not comparable
Reasoning
BenchmarkClaude 3.5 SonnetGPT-5.2Result
ARC-AGI-2Source —52.9%Not comparable
AA-LCRSource —72.7%Not comparable
CritPtSource —11.6%Not comparable
KnowledgeGPT-5.2 wins
BenchmarkClaude 3.5 SonnetGPT-5.2Result
GPQASource 59.4%92.4%GPT-5.2 leads
Artificial Analysis Intelligence IndexSource —42.2%Not comparable
AA-GPQA DiamondSource —90.3%Not comparable
AA-HLESource —35.4%Not comparable
AA-Omniscience IndexSource —-1.0%Not comparable
AA-Omniscience AccuracySource —43.8%Not comparable
AA-Omniscience Hallucination RateSource —79.7%Not comparable
MathGPT-5.2 wins
BenchmarkClaude 3.5 SonnetGPT-5.2Result
FrontierMath v2 (Tiers 1-3)Source 2.069%40.700%GPT-5.2 leads
FrontierMath v2 (Tier 4)Source 0.000%18.800%GPT-5.2 leads
AA AIME 2025Source —99.0%Not comparable
Multimodal
BenchmarkClaude 3.5 SonnetGPT-5.2Result
MMMU-ProSource —79.5%Not comparable
MathVisionSource —83.0%Not comparable
CharXivSource —82.1%Not comparable
V*Source —75.9%Not comparable
Design Arena WebsiteSource —1227Not comparable
Inst. Following
BenchmarkClaude 3.5 SonnetGPT-5.2Result
AA-IFBenchSource —75.4%Not comparable
Frequently Asked Questions (4)

Which is better, Claude 3.5 Sonnet or GPT-5.2?

GPT-5.2 is ahead on BenchLM's BenchAlign leaderboard, 58.43 to 47.74. The biggest single separator in this matchup is FrontierMath v2 (Tiers 1-3), where the scores are 2.069% and 40.700%.

Which is better for knowledge tasks, Claude 3.5 Sonnet or GPT-5.2?

GPT-5.2 has the edge for knowledge tasks in this comparison, averaging 92.4 versus 59.4. 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-5.2?

GPT-5.2 has the edge for coding in this comparison, averaging 70.6 versus 49. Inside this category, SWE-bench Verified is the benchmark that creates the most daylight between them.

Which is better for math, Claude 3.5 Sonnet or GPT-5.2?

GPT-5.2 has the edge for math in this comparison, averaging 35.2 versus 1.6. Inside this category, FrontierMath v2 (Tiers 1-3) is the benchmark that creates the most daylight between them.

Related Comparisons

Explore More

Anthropic Compare Pricing Methodology Find Your Best LLM Overall Rankings
Last updated: July 20, 2026

Choose a model with this week’s evidence

Join 2,000+ readers for ranking moves, pricing changes, and the claims that still need proof.

One email each week. Unsubscribe anytime.