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Claude Sonnet 5.5 vs GPT-5.2

Claude Sonnet 5.5 leads GPT-5.2 on coding, 87.3 to 55.9 on the Vibe Coding Index, and Claude Sonnet 5.5 costs 1.4x less per output token ($10.00 vs $14.00 per million). Updated October 22, 2026; 61 benchmarks have a result for both.

Replace Claude Sonnet 5.5 Replace GPT-5.2
Claude Sonnet 5.5Anthropic
Coding
87.3
Overall
82.8
Output $/M
$10.00
60
GPT-5.2OpenAI
Coding
55.9
Overall
60.7
Output $/M
$14.00
0
vs boards won of 61 shared, 1 tied

Claude Sonnet 5.5 or GPT-5.2: which to pick

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 55.9 for GPT-5.2.

GPT-5.2 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Model AClaude Sonnet 5.5Anthropic87.3/1005 independent benchmarksNo cost per solved taskModel BGPT-5.2OpenAI55.9/1003 independent benchmarks$1.91 per solved task
Shared results
61
Claude Sonnet 5.5 only
35
GPT-5.2 only
53
Like-for-like categories
8 of 9

Only benchmarks that tested both models count toward a pick; a result only one model has is shown but not compared.

Which one for your work

Each card is decided by one number both models carry. Where only one has it, the card says so and makes no call.

At a glance

Coding index
Claude Sonnet 5.5 87.3 from 5 benchmarks, GPT-5.2 55.9 from 3 benchmarks.
Widest category
Agentic work, 31.9 points apart on average over 3 shared benchmarks.
Widest single gap
ProofBench: Claude Sonnet 5.5 100.0% against GPT-5.2 15.0%, 85.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 5.5 $10.00 against GPT-5.2 $14.00 per million output tokens, 1.4x apart.
Context window
Claude Sonnet 5.5 takes 1M tokens, GPT-5.2 400K.

Benchmark by benchmark

First the score: boards each model leads, per category, where both have a result. Then every board, a category to a fold; bars are each result on a 0 to 100 scale, so compare the two in a row, not one row with another.

Boards won, where both have a result
CategoryClaude Sonnet 5.5BarsGPT-5.2Ties
Coding60
Intelligence20
Agentic work30
Reasoning90
Math60
Knowledge60
Web design60
General2201 tie
All shared boards6001 tie
CodingLike-for-likeSix of these boards feed the Vibe Coding Index60
Coding benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
SWE-bench VerifiedNot measured72.8%Only GPT-5.2 measured
SWE-bench MultilingualNot measured66.7%Only GPT-5.2 measured
LiveBench coding94.7%Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev17681417Claude Sonnet 5.5
LiveCodeBench (Vals AI)Not measured85.4%Only GPT-5.2 measured
SWE-bench Verified (Vals AI)Not measured75.8%Only GPT-5.2 measured
Terminal-Bench 4 (Vals AI)64.1%Not measuredOnly Claude Sonnet 5.5 measured
Vibe Code Bench (Vals AI)92.4%53.5%Claude Sonnet 5.5
Code migration (Vals AI)69.8%Not measuredOnly Claude Sonnet 5.5 measured
ProgramBench (Vals AI)6.5%Not measuredOnly Claude Sonnet 5.5 measured
IOI (Vals AI)83.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench 2.1 (Vals AI)83.2%Not measuredOnly Claude Sonnet 5.5 measured
SWE-bench Multimodal (Vals AI)58.3%Not measuredOnly Claude Sonnet 5.5 measured
CyberBench (Vals AI)59.6%Not measuredOnly Claude Sonnet 5.5 measured
LiveCodeBench (Artificial Analysis run)Not measured89.4%Only GPT-5.2 measured
SciCode61.0%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured47.0%Only GPT-5.2 measured
Terminal-BenchNot measured64.9%Only GPT-5.2 measured
FrontierCode52.1%Not measuredOnly Claude Sonnet 5.5 measured
FrontierSWE61.9%Not measuredOnly Claude Sonnet 5.5 measured
GSO-BenchNot measured27.5%Only GPT-5.2 measured
WeirdMLNot measured72.2%Only GPT-5.2 measured
ALE-Bench1819.11293.5Claude Sonnet 5.5
LMArena Text: coding15131442Claude Sonnet 5.5
LMArena Text: software and IT15041434Claude Sonnet 5.5
LMArena WebDev: React1817Not measuredOnly Claude Sonnet 5.5 measured
LMArena WebDev: HTML17411427Claude Sonnet 5.5
LMArena WebDev: from an image1737Not measuredOnly Claude Sonnet 5.5 measured
SciCode13.8%Not measuredOnly Claude Sonnet 5.5 measured
Neither model has a result on the other 10 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
AA Intelligence Index56.030.4Claude Sonnet 5.5
Epoch Capabilities Index166.2153.7Claude Sonnet 5.5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index30
Agentic work benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
Design Arena: agents building web apps13051086Claude Sonnet 5.5
Design Arena: agents building full-stack appsNot measured1043Only GPT-5.2 measured
Design Arena: agents building mobile apps12601093Claude Sonnet 5.5
Design Arena: agents building Android appsNot measured1059Only GPT-5.2 measured
Design Arena: agents building Godot gamesNot measured1142Only GPT-5.2 measured
Design Arena: spreadsheets1260Not measuredOnly Claude Sonnet 5.5 measured
LiveBench research83.6%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench browser84.0%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench long agentic78.8%Not measuredOnly Claude Sonnet 5.5 measured
SREBench (Vals AI)30.1%Not measuredOnly Claude Sonnet 5.5 measured
Finance Agent (Vals AI)58.1%Not measuredOnly Claude Sonnet 5.5 measured
Tax Agent Bench (Vals AI)42.0%Not measuredOnly Claude Sonnet 5.5 measured
Legal Research Bench (Vals AI)48.1%Not measuredOnly Claude Sonnet 5.5 measured
Harvey's Legal Agent Benchmark (Vals AI)10.4%Not measuredOnly Claude Sonnet 5.5 measured
Excel Modeling Benchmark (Vals AI)75.7%Not measuredOnly Claude Sonnet 5.5 measured
BioMysteryBench (Vals AI)81.1%Not measuredOnly Claude Sonnet 5.5 measured
Terminal-Bench-Science (Vals AI)47.1%Not measuredOnly Claude Sonnet 5.5 measured
Vals Science Index59.1%Not measuredOnly Claude Sonnet 5.5 measured
τ²-Bench TelecomNot measured84.8%Only GPT-5.2 measured
APEX-Agents75.5%Not measuredOnly Claude Sonnet 5.5 measured
METR time horizonsNot measured75.3%Only GPT-5.2 measured
Remote Labor IndexNot measured2.5%Only GPT-5.2 measured
GDPvalNot measured49.7%Only GPT-5.2 measured
DeepResearch BenchNot measured41.1%Only GPT-5.2 measured
SpireClimb1.3%Not measuredOnly Claude Sonnet 5.5 measured
Vending-Bench 2$11,165$3,591Claude Sonnet 5.5
Berkeley Function Calling Leaderboard (BFCL)Not measured55.9%Only GPT-5.2 measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index90
Reasoning benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
GPQA DiamondNot measured91.7%Only GPT-5.2 measured
LiveBench reasoning91.6%Not measuredOnly Claude Sonnet 5.5 measured
MysteryMechanism (Vals AI)49.1%Not measuredOnly Claude Sonnet 5.5 measured
MMMU Pro (Vals AI)Not measured86.7%Only GPT-5.2 measured
GPQA Diamond (Artificial Analysis run)Not measured90.3%Only GPT-5.2 measured
Humanity's Last Exam (Artificial Analysis run)55.0%37.7%Claude Sonnet 5.5
GPQA Diamond (Epoch AI run)95.6%91.4%Claude Sonnet 5.5
ARC-AGINot measured86.2%Only GPT-5.2 measured
ARC-AGI-2Not measured52.9%Only GPT-5.2 measured
SimpleBenchNot measured45.8%Only GPT-5.2 measured
Chess puzzles59.0%48.0%Claude Sonnet 5.5
Mystery game puzzles65.0%23.0%Claude Sonnet 5.5
EBR-benchNot measured23.0%Only GPT-5.2 measured
VPCTNot measured84.0%Only GPT-5.2 measured
LMArena Text: hard prompts14941428Claude Sonnet 5.5
LMArena Text: expert15311445Claude Sonnet 5.5
LMArena Text: hard prompts in English15021431Claude Sonnet 5.5
LMArena Vision: diagrams13291265Claude Sonnet 5.5
LMArena Vision: homework13311276Claude Sonnet 5.5
Kagi LLM BenchmarkNot measured73.3%Only GPT-5.2 measured
Neither model has a result on the other 2 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
AIMENot measured96.9%Only GPT-5.2 measured
MGSM (Vals AI)Not measured94.0%Only GPT-5.2 measured
AA Math IndexNot measured99.0Only GPT-5.2 measured
AIME 2025 (Artificial Analysis run)Not measured99.0%Only GPT-5.2 measured
OTIS Mock AIME100.0%96.1%Claude Sonnet 5.5
FrontierMath, tiers 1 to 388.8%67.4%Claude Sonnet 5.5
FrontierMath, tier 480.5%31.7%Claude Sonnet 5.5
ProofBench100.0%15.0%Claude Sonnet 5.5
LMArena Text: math14971440Claude Sonnet 5.5
LMArena Text: mathematical work15101442Claude Sonnet 5.5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index60
Knowledge benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
MMLU ProNot measured86.2%Only GPT-5.2 measured
LegalBench (Vals AI)Not measured82.8%Only GPT-5.2 measured
CaseLaw (Vals AI)Not measured66.0%Only GPT-5.2 measured
CorpFin (Vals AI)Not measured65.9%Only GPT-5.2 measured
TaxEval (Vals AI)Not measured75.8%Only GPT-5.2 measured
MortgageTax (Vals AI)Not measured67.1%Only GPT-5.2 measured
MedQA (Vals AI)Not measured94.1%Only GPT-5.2 measured
MedCode (Vals AI)52.9%49.8%Claude Sonnet 5.5
MMLU Pro (Artificial Analysis run)Not measured87.4%Only GPT-5.2 measured
SimpleQA Verified46.5%37.1%Claude Sonnet 5.5
LMArena Text: science14831425Claude Sonnet 5.5
LMArena Text: medicine and healthcare14641425Claude Sonnet 5.5
LMArena Text: legal and government14831427Claude Sonnet 5.5
LMArena Text: business and finance14681414Claude Sonnet 5.5
FACTS Benchmark SuiteNot measured48.5%Only GPT-5.2 measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index60
Web design benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
Design Arena: websites13261195Claude Sonnet 5.5
Design Arena: UI components13681190Claude Sonnet 5.5
Design Arena: game dev14711195Claude Sonnet 5.5
Design Arena: data viz13921202Claude Sonnet 5.5
Design Arena: 3D14451079Claude Sonnet 5.5
Design Arena: all code categories13641170Claude Sonnet 5.5
Design Arena: SVGNot measured1139Only GPT-5.2 measured
Design Arena: ASCII artNot measured1152Only GPT-5.2 measured
LiveBench design85.0%Not measuredOnly Claude Sonnet 5.5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index220
General benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
Vals Index70.8%Not measuredOnly Claude Sonnet 5.5 measured
LiveBench data analysis59.5%Not measuredOnly Claude Sonnet 5.5 measured
Public Benefits Bench (Vals AI)67.2%Not measuredOnly Claude Sonnet 5.5 measured
SAGE (Vals AI)51.8%49.3%Claude Sonnet 5.5
MedScribe (Vals AI)91.1%84.4%Claude Sonnet 5.5
IFBenchNot measured75.4%Only GPT-5.2 measured
Long context reasoning (AA-LCR)82.7%82.7%Tie
DTBench97.3%90.9%Claude Sonnet 5.5
LMCA68.3%43.9%Claude Sonnet 5.5
CL-benchNot measured18.2%Only GPT-5.2 measured
Furniture assembly75.0%38.3%Claude Sonnet 5.5
LMArena Text14731416Claude Sonnet 5.5
LMArena Text: instruction following14921409Claude Sonnet 5.5
LMArena Text: creative writing14671376Claude Sonnet 5.5
LMArena Vision12871246Claude Sonnet 5.5
LMArena Text: English14841422Claude Sonnet 5.5
LMArena Text: non-English14561405Claude Sonnet 5.5
LMArena Text: Chinese15351447Claude Sonnet 5.5
LMArena Text: GermanNot measured1444Only GPT-5.2 measured
LMArena Text: JapaneseNot measured1420Only GPT-5.2 measured
LMArena Text: KoreanNot measured1374Only GPT-5.2 measured
LMArena Text: French14991454Claude Sonnet 5.5
LMArena Text: Spanish14511413Claude Sonnet 5.5
LMArena Text: Russian14541415Claude Sonnet 5.5
LMArena Text: PolishNot measured1426Only GPT-5.2 measured
LMArena Text: multi-turn14651419Claude Sonnet 5.5
LMArena Text: longer queries14951413Claude Sonnet 5.5
LMArena Text: writing and language14741392Claude Sonnet 5.5
LMArena Text: entertainment and media14611378Claude Sonnet 5.5
LMArena Vision: English12891243Claude Sonnet 5.5
LMArena Vision: ChineseNot measured1305Only GPT-5.2 measured
LMArena Vision: reading text12971257Claude Sonnet 5.5
LMArena Vision: humorNot measured1227Only GPT-5.2 measured
LMArena Vision: captioningNot measured1267Only GPT-5.2 measured
LMArena Vision: recognizing thingsNot measured1232Only GPT-5.2 measured
LMArena Vision: creative writing12421225Claude Sonnet 5.5
LMArena DocumentNot measured1405Only GPT-5.2 measured
Neither model has a result on the other 9 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5.5 and GPT-5.2
BenchmarkClaude Sonnet 5.5GPT-5.2Leader
Neither model has a result on 5 boards here

What each workload costs

Three fixed token mixes at each model's listed price, so per-token rates become a bill.

Chat turn

1K input + 500 output tokens

Claude Sonnet 5.5$0.0070Fits in one request
GPT-5.2$0.0088Fits in one request

Claude Sonnet 5.5 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5.5$0.130Fits in one request
GPT-5.2$0.130Fits in one request

GPT-5.2 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5.5$0.500Fits in one request
GPT-5.2$0.490Fits in one request

GPT-5.2 costs less

Listed OpenRouter rates, without cache or batch discounts. A workload that does not fit a model's context window would need splitting.

Specification differences

The leading value in a row is marked; a row with a missing value names no leader. Our two rows are marked in red.

Specifications of Claude Sonnet 5.5 and GPT-5.2
SpecificationAnthropic Claude Sonnet 5.5OpenAI GPT-5.2
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 28, 2026December 10, 2025
Context window1M400K
Input $/Mtok$2.00$1.75
Output $/Mtok$10.00$14.00
Coding index87.355.9
Independent measurements behind it53
Cost per solved taskNot computable$1.91
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5.5 better than GPT-5.2 for coding?

Pick Claude Sonnet 5.5 for coding: it scores 87.3 on the Vibe Coding Index against 55.9 for GPT-5.2. GPT-5.2 is neither cheaper nor larger in context, and leads no benchmark both models were measured on.

Which is cheaper, Claude Sonnet 5.5 or GPT-5.2?

Claude Sonnet 5.5 costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.2 costs $1.75 and $14.00. Cost per solved task is known for GPT-5.2 only.

Which has the bigger context window, Claude Sonnet 5.5 or GPT-5.2?

Claude Sonnet 5.5, with 1M tokens against 400K.

How many benchmarks is the Claude Sonnet 5.5 vs GPT-5.2 comparison based on?

61 benchmarks have a result for both models as of October 22, 2026. Claude Sonnet 5.5's coding index rests on 5 independent benchmarks and GPT-5.2's on 3. Where only one model has a result, the page says so instead of naming a winner.

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