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Claude Sonnet 5 vs GPT-5.1

Claude Sonnet 5 leads GPT-5.1 on coding, 57.7 to 40.4 on the Vibe Coding Index, at about the same output price ($10.00 vs $10.00 per million). Updated October 21, 2026; 79 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace GPT-5.1
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
61
GPT-5.1OpenAI
Coding
40.4
Overall
55.0
Output $/M
$10.00
18
vs boards won of 79 shared

Claude Sonnet 5 or GPT-5.1: which to pick

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 40.4 for GPT-5.1.

Pick GPT-5.1 for a lower cost per solved task ($1.02 against $1.87) and work measured by LiveCodeBench (Vals AI) or MMMU Pro (Vals AI), where it leads.

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BGPT-5.1OpenAI40.4/1003 independent benchmarks$1.02 per solved task
Shared results
79
Claude Sonnet 5 only
42
GPT-5.1 only
22
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 57.7 from 6 benchmarks, GPT-5.1 40.4 from 3 benchmarks.
Widest category
Agentic work, 30.7 points apart on average over 1 shared benchmark.
Widest single gap
Vibe Code Bench (Vals AI): Claude Sonnet 5 81.3% against GPT-5.1 24.6%, 56.7 points apart on a 0 to 100 scale.
Output price
Both cost $10.00 per million output tokens.
Context window
Claude Sonnet 5 takes 1M tokens, GPT-5.1 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 5BarsGPT-5.1Ties
Coding111
Intelligence20
Agentic work10
Reasoning121
Math30
Knowledge65
Web design80
General1811
All shared boards6118
CodingLike-for-likeSix of these boards feed the Vibe Coding Index111
Coding benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
SWE-bench VerifiedNot measured66.0%Only GPT-5.1 measured
LiveBench coding74.7%Not measuredOnly Claude Sonnet 5 measured
LMArena WebDev15401396Claude Sonnet 5
AA Coding Index71.549.4Claude Sonnet 5
LiveCodeBench (Vals AI)82.4%86.5%GPT-5.1
SWE-bench Verified (Vals AI)79.6%69.8%Claude Sonnet 5
Terminal-Bench 4 (Vals AI)10.6%Not measuredOnly Claude Sonnet 5 measured
Vibe Code Bench (Vals AI)81.3%24.6%Claude Sonnet 5
Code migration (Vals AI)44.4%Not measuredOnly Claude Sonnet 5 measured
ProgramBench (Vals AI)0.0%Not measuredOnly Claude Sonnet 5 measured
IOI (Vals AI)45.0%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench 2.1 (Vals AI)74.5%Not measuredOnly Claude Sonnet 5 measured
Vibe Code Bench 1-100 (Vals AI)13.8%Not measuredOnly Claude Sonnet 5 measured
SkillsBench (Vals AI)46.5%Not measuredOnly Claude Sonnet 5 measured
CyberBench (Vals AI)70.3%Not measuredOnly Claude Sonnet 5 measured
LiveCodeBench (Artificial Analysis run)Not measured86.8%Only GPT-5.1 measured
SciCode54.3%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench Hard (Artificial Analysis run)Not measured45.5%Only GPT-5.1 measured
Terminal-BenchNot measured47.6%Only GPT-5.1 measured
FrontierCode42.7%Not measuredOnly Claude Sonnet 5 measured
GSO-Bench37.3%13.7%Claude Sonnet 5
WeirdML68.8%60.8%Claude Sonnet 5
ALE-Bench1463.1Not measuredOnly Claude Sonnet 5 measured
LMArena Text: coding14831453Claude Sonnet 5
LMArena Text: software and IT14741454Claude Sonnet 5
LMArena WebDev: React15411307Claude Sonnet 5
LMArena WebDev: HTML15271405Claude Sonnet 5
LMArena WebDev: from an image15401421Claude Sonnet 5
SciCode10.7%Not measuredOnly Claude Sonnet 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 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
AA Intelligence Index38.224.7Claude Sonnet 5
Epoch Capabilities Index156.9149.8Claude Sonnet 5
Agentic workLike-for-likePublic boards, shown as published, kept out of the index10
Agentic work benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
AA Agentic Index43.6Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building web apps1245Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building full-stack apps1249Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building mobile apps1215Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building Android apps1225Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building Godot games1225Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building games1227Not measuredOnly Claude Sonnet 5 measured
Design Arena: HTML slides1218Not measuredOnly Claude Sonnet 5 measured
Design Arena: PowerPoint slides1216Not measuredOnly Claude Sonnet 5 measured
Design Arena: spreadsheets1021Not measuredOnly Claude Sonnet 5 measured
LiveBench research82.8%Not measuredOnly Claude Sonnet 5 measured
LiveBench browser72.0%Not measuredOnly Claude Sonnet 5 measured
LiveBench long agentic39.0%Not measuredOnly Claude Sonnet 5 measured
SREBench (Vals AI)0.4%Not measuredOnly Claude Sonnet 5 measured
Finance Agent (Vals AI)53.9%Not measuredOnly Claude Sonnet 5 measured
Tax Agent Bench (Vals AI)29.4%Not measuredOnly Claude Sonnet 5 measured
Legal Research Bench (Vals AI)41.8%Not measuredOnly Claude Sonnet 5 measured
Excel Modeling Benchmark (Vals AI)66.3%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench-Science (Vals AI)5.7%Not measuredOnly Claude Sonnet 5 measured
τ²-Bench TelecomNot measured81.9%Only GPT-5.1 measured
APEX-Agents54.5%Not measuredOnly Claude Sonnet 5 measured
DeepResearch BenchNot measured42.8%Only GPT-5.1 measured
Vending-Bench 2$6,378$1,473Claude Sonnet 5
Neither model has a result on the other 18 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index121
Reasoning benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
GPQA Diamond88.9%86.6%Claude Sonnet 5
LiveBench reasoning88.7%Not measuredOnly Claude Sonnet 5 measured
MMMU Pro (Vals AI)83.0%83.2%GPT-5.1
GPQA Diamond (Artificial Analysis run)91.1%87.3%Claude Sonnet 5
Humanity's Last Exam (Artificial Analysis run)41.3%28.5%Claude Sonnet 5
GPQA Diamond (Epoch AI run)90.5%87.6%Claude Sonnet 5
ARC-AGINot measured72.8%Only GPT-5.1 measured
ARC-AGI-2Not measured17.6%Only GPT-5.1 measured
SimpleBench60.6%53.2%Claude Sonnet 5
Chess puzzles45.0%42.0%Claude Sonnet 5
Mystery game puzzles35.0%19.0%Claude Sonnet 5
VPCTNot measured58.7%Only GPT-5.1 measured
LMArena Text: hard prompts14611457Claude Sonnet 5
LMArena Text: expert14891470Claude Sonnet 5
LMArena Text: hard prompts in English14641462Claude Sonnet 5
LMArena Vision: diagrams12931264Claude Sonnet 5
LMArena Vision: homework13111272Claude Sonnet 5
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index30
Math benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
AIMENot measured93.3%Only GPT-5.1 measured
MGSM (Vals AI)Not measured93.0%Only GPT-5.1 measured
AA Math IndexNot measured94.0Only GPT-5.1 measured
AIME 2025 (Artificial Analysis run)Not measured94.0%Only GPT-5.1 measured
OTIS Mock AIME94.7%88.6%Claude Sonnet 5
FrontierMath, tiers 1 to 365.6%Not measuredOnly Claude Sonnet 5 measured
FrontierMath, tier 429.3%Not measuredOnly Claude Sonnet 5 measured
ProofBench77.0%Not measuredOnly Claude Sonnet 5 measured
LMArena Text: math14671446Claude Sonnet 5
LMArena Text: mathematical work14811449Claude Sonnet 5
Neither model has a result on the other 3 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index65
Knowledge benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
MMLU Pro87.5%86.4%Claude Sonnet 5
LegalBench (Vals AI)83.9%85.7%GPT-5.1
CaseLaw (Vals AI)Not measured73.4%Only GPT-5.1 measured
CorpFin (Vals AI)67.0%63.8%Claude Sonnet 5
TaxEval (Vals AI)75.6%74.9%Claude Sonnet 5
MortgageTax (Vals AI)70.0%61.4%Claude Sonnet 5
MedQA (Vals AI)Not measured96.4%Only GPT-5.1 measured
MedCode (Vals AI)47.5%52.7%GPT-5.1
MMLU Pro (Artificial Analysis run)Not measured87.0%Only GPT-5.1 measured
SimpleQA Verified33.7%48.0%GPT-5.1
LMArena Text: science14601459Claude Sonnet 5
LMArena Text: medicine and healthcare14421456GPT-5.1
LMArena Text: legal and government14541459GPT-5.1
LMArena Text: business and finance14361431Claude Sonnet 5
FACTS Benchmark SuiteNot measured45.0%Only GPT-5.1 measured
Neither model has a result on the other 3 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
Design Arena: websites12741187Claude Sonnet 5
Design Arena: UI components12801166Claude Sonnet 5
Design Arena: game dev12781179Claude Sonnet 5
Design Arena: data viz12511204Claude Sonnet 5
Design Arena: 3D12611061Claude Sonnet 5
Design Arena: all code categories12761171Claude Sonnet 5
Design Arena: SVG11931149Claude Sonnet 5
Design Arena: ASCII art12071119Claude Sonnet 5
LiveBench design82.0%Not measuredOnly Claude Sonnet 5 measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1811
General benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
LiveBench data analysis71.7%Not measuredOnly Claude Sonnet 5 measured
Public Benefits Bench (Vals AI)66.0%Not measuredOnly Claude Sonnet 5 measured
SAGE (Vals AI)48.9%43.2%Claude Sonnet 5
MedScribe (Vals AI)76.0%88.1%GPT-5.1
Vals Multimodal Index68.8%Not measuredOnly Claude Sonnet 5 measured
IFBenchNot measured72.9%Only GPT-5.1 measured
Long context reasoning (AA-LCR)82.0%80.0%Claude Sonnet 5
DTBench92.5%90.1%Claude Sonnet 5
LMCA50.0%43.9%Claude Sonnet 5
CL-benchNot measured23.7%Only GPT-5.1 measured
Surface Evolver Bench60.0%Not measuredOnly Claude Sonnet 5 measured
CL-bench LifeNot measured17.3%Only GPT-5.1 measured
LMArena Text14421443GPT-5.1
LMArena Text: instruction following14521443Claude Sonnet 5
LMArena Text: creative writing14161427GPT-5.1
LMArena Vision12731250Claude Sonnet 5
LMArena Text: English14501451GPT-5.1
LMArena Text: non-English14311431GPT-5.1
LMArena Text: Chinese14781495GPT-5.1
LMArena Text: German14421438Claude Sonnet 5
LMArena Text: Japanese14221453GPT-5.1
LMArena Text: Korean14121401Claude Sonnet 5
LMArena Text: French14631450Claude Sonnet 5
LMArena Text: Spanish14381433Claude Sonnet 5
LMArena Text: Russian14501435Claude Sonnet 5
LMArena Text: Polish14251440GPT-5.1
LMArena Text: multi-turn14531450Claude Sonnet 5
LMArena Text: longer queries14621448Claude Sonnet 5
LMArena Text: writing and language14361428Claude Sonnet 5
LMArena Text: entertainment and media14111415GPT-5.1
LMArena Vision: English12751252Claude Sonnet 5
LMArena Vision: Chinese13311270Claude Sonnet 5
LMArena Vision: reading text12881255Claude Sonnet 5
LMArena Vision: humor12611263GPT-5.1
LMArena Vision: captioningNot measured1252Only GPT-5.1 measured
LMArena Vision: recognizing thingsNot measured1232Only GPT-5.1 measured
LMArena Vision: creative writing12461266GPT-5.1
LMArena Document14661403Claude Sonnet 5
Neither model has a result on the other 8 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for Claude Sonnet 5 and GPT-5.1
BenchmarkClaude Sonnet 5GPT-5.1Leader
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$0.0070Fits in one request
GPT-5.1$0.0063Fits in one request

GPT-5.1 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
GPT-5.1$0.092Fits in one request

GPT-5.1 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
GPT-5.1$0.350Fits in one request

GPT-5.1 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 and GPT-5.1
SpecificationAnthropic Claude Sonnet 5OpenAI GPT-5.1
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026November 13, 2025
Context window1M400K
Input $/Mtok$2.00$1.25
Output $/Mtok$10.00$10.00
Coding index57.740.4
Independent measurements behind it63
Cost per solved task$1.87$1.02
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than GPT-5.1 for coding?

Pick Claude Sonnet 5 for coding: it scores 57.7 on the Vibe Coding Index against 40.4 for GPT-5.1. Pick GPT-5.1 for a lower cost per solved task ($1.02 against $1.87) and work measured by LiveCodeBench (Vals AI) or MMMU Pro (Vals AI), where it leads.

Which is cheaper, Claude Sonnet 5 or GPT-5.1?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-5.1 costs $1.25 and $10.00. Per solved SWE-bench Verified task, Claude Sonnet 5 costs $1.87 and GPT-5.1 $1.02.

Which has the bigger context window, Claude Sonnet 5 or GPT-5.1?

Claude Sonnet 5, with 1M tokens against 400K.

How many benchmarks is the Claude Sonnet 5 vs GPT-5.1 comparison based on?

79 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 5's coding index rests on 6 independent benchmarks and GPT-5.1's on 3. Where only one model has a result, the page says so instead of naming a winner.

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