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Claude Sonnet 5 vs GPT-6.1 Sol

GPT-6.1 Sol leads Claude Sonnet 5 on coding, 82.4 to 57.7 on the Vibe Coding Index, at about the same output price ($10.00 vs $10.00 per million). Updated October 21, 2026; 85 benchmarks have a result for both.

Replace Claude Sonnet 5 Replace GPT-6.1 Sol
Claude Sonnet 5Anthropic
Coding
57.7
Overall
63.2
Output $/M
$10.00
16
GPT-6.1 SolOpenAI
Coding
82.4
Overall
81.4
Output $/M
$10.00
69
vs boards won of 85 shared

Claude Sonnet 5 or GPT-6.1 Sol: which to pick

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 57.7 for Claude Sonnet 5, though on 5 benchmarks against 6.

Pick Claude Sonnet 5 for work measured by CyberBench (Vals AI) or LMArena Text: coding, where it leads.

Model AClaude Sonnet 5Anthropic57.7/1006 independent benchmarks$1.87 per solved taskModel BGPT-6.1 SolOpenAI82.4/1005 independent benchmarksNo cost per solved task
Shared results
85
Claude Sonnet 5 only
36
GPT-6.1 Sol only
13
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-6.1 Sol 82.4 from 5 benchmarks.
Widest category
Math, 22.5 points apart on average over 6 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Sonnet 5 29.3% against GPT-6.1 Sol 100.0%, 70.7 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-6.1 Sol 1.05M.

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-6.1 SolTies
Coding314
Intelligence02
Agentic work49
Reasoning19
Math06
Knowledge24
Web design07
General618
All shared boards1669
CodingLike-for-likeSix of these boards feed the Vibe Coding Index314
Coding benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
LiveBench coding74.7%96.0%GPT-6.1 Sol
LMArena WebDev15401753GPT-6.1 Sol
AA Coding Index71.5Not measuredOnly Claude Sonnet 5 measured
LiveCodeBench (Vals AI)82.4%Not measuredOnly Claude Sonnet 5 measured
SWE-bench Verified (Vals AI)79.6%Not measuredOnly Claude Sonnet 5 measured
Terminal-Bench 4 (Vals AI)10.6%55.0%GPT-6.1 Sol
Vibe Code Bench (Vals AI)81.3%88.9%GPT-6.1 Sol
Code migration (Vals AI)44.4%65.1%GPT-6.1 Sol
ProgramBench (Vals AI)0.0%3.0%GPT-6.1 Sol
IOI (Vals AI)45.0%96.9%GPT-6.1 Sol
Terminal-Bench 2.1 (Vals AI)74.5%Not measuredOnly Claude Sonnet 5 measured
SWE-bench Multimodal (Vals AI)Not measured43.5%Only GPT-6.1 Sol 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%39.3%Claude Sonnet 5
SciCode54.3%55.8%GPT-6.1 Sol
FrontierCode42.7%50.2%GPT-6.1 Sol
GSO-Bench37.3%Not measuredOnly Claude Sonnet 5 measured
WeirdML68.8%Not measuredOnly Claude Sonnet 5 measured
ALE-Bench1463.12743.8GPT-6.1 Sol
LMArena Text: coding14831478Claude Sonnet 5
LMArena Text: software and IT14741476GPT-6.1 Sol
LMArena WebDev: React15411754GPT-6.1 Sol
LMArena WebDev: HTML15271800GPT-6.1 Sol
LMArena WebDev: from an image15401702GPT-6.1 Sol
SciCode10.7%9.2%Claude Sonnet 5
Neither model has a result on the other 13 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
AA Intelligence Index38.251.8GPT-6.1 Sol
Epoch Capabilities Index156.9168.4GPT-6.1 Sol
Agentic workLike-for-likePublic boards, shown as published, kept out of the index49
Agentic work benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
AA Agentic Index43.6Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building web apps12451306GPT-6.1 Sol
Design Arena: agents building full-stack apps1249Not measuredOnly Claude Sonnet 5 measured
Design Arena: agents building mobile apps12151204Claude Sonnet 5
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: spreadsheets10211242GPT-6.1 Sol
LiveBench research82.8%83.5%GPT-6.1 Sol
LiveBench browser72.0%88.0%GPT-6.1 Sol
LiveBench long agentic39.0%73.0%GPT-6.1 Sol
SREBench (Vals AI)0.4%50.8%GPT-6.1 Sol
Finance Agent (Vals AI)53.9%52.0%Claude Sonnet 5
Tax Agent Bench (Vals AI)29.4%21.8%Claude Sonnet 5
Legal Research Bench (Vals AI)41.8%38.5%Claude Sonnet 5
Harvey's Legal Agent Benchmark (Vals AI)Not measured6.3%Only GPT-6.1 Sol measured
Excel Modeling Benchmark (Vals AI)66.3%70.8%GPT-6.1 Sol
BioMysteryBench (Vals AI)Not measured79.6%Only GPT-6.1 Sol measured
Terminal-Bench-Science (Vals AI)5.7%52.9%GPT-6.1 Sol
Vals Science IndexNot measured59.6%Only GPT-6.1 Sol measured
Robo-bench (Vals AI)Not measured28.3%Only GPT-6.1 Sol measured
APEX-Agents54.5%60.0%GPT-6.1 Sol
SpireClimbNot measured24.7%Only GPT-6.1 Sol measured
Vending-Bench 2$6,378Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 15 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index19
Reasoning benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
GPQA Diamond88.9%Not measuredOnly Claude Sonnet 5 measured
LiveBench reasoning88.7%92.6%GPT-6.1 Sol
MysteryMechanism (Vals AI)Not measured46.4%Only GPT-6.1 Sol measured
MMMU Pro (Vals AI)83.0%Not measuredOnly Claude Sonnet 5 measured
GPQA Diamond (Artificial Analysis run)91.1%Not measuredOnly Claude Sonnet 5 measured
Humanity's Last Exam (Artificial Analysis run)41.3%52.9%GPT-6.1 Sol
GPQA Diamond (Epoch AI run)90.5%95.4%GPT-6.1 Sol
ARC-AGINot measured98.5%Only GPT-6.1 Sol measured
ARC-AGI-2Not measured94.2%Only GPT-6.1 Sol measured
SimpleBench60.6%Not measuredOnly Claude Sonnet 5 measured
Chess puzzles45.0%68.0%GPT-6.1 Sol
Mystery game puzzles35.0%80.0%GPT-6.1 Sol
EBR-benchNot measured54.3%Only GPT-6.1 Sol measured
LMArena Text: hard prompts14611463GPT-6.1 Sol
LMArena Text: expert14891489Claude Sonnet 5
LMArena Text: hard prompts in English14641465GPT-6.1 Sol
LMArena Vision: diagrams12931306GPT-6.1 Sol
LMArena Vision: homework13111356GPT-6.1 Sol
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index06
Math benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
OTIS Mock AIME94.7%100.0%GPT-6.1 Sol
FrontierMath, tiers 1 to 365.6%93.7%GPT-6.1 Sol
FrontierMath, tier 429.3%100.0%GPT-6.1 Sol
ProofBench77.0%99.0%GPT-6.1 Sol
LMArena Text: math14671489GPT-6.1 Sol
LMArena Text: mathematical work14811513GPT-6.1 Sol
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index24
Knowledge benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
MMLU Pro87.5%Not measuredOnly Claude Sonnet 5 measured
LegalBench (Vals AI)83.9%Not measuredOnly Claude Sonnet 5 measured
CorpFin (Vals AI)67.0%Not measuredOnly Claude Sonnet 5 measured
TaxEval (Vals AI)75.6%Not measuredOnly Claude Sonnet 5 measured
MortgageTax (Vals AI)70.0%Not measuredOnly Claude Sonnet 5 measured
MedCode (Vals AI)47.5%48.8%GPT-6.1 Sol
SimpleQA Verified33.7%73.9%GPT-6.1 Sol
LMArena Text: science14601444Claude Sonnet 5
LMArena Text: medicine and healthcare14421433Claude Sonnet 5
LMArena Text: legal and government14541471GPT-6.1 Sol
LMArena Text: business and finance14361445GPT-6.1 Sol
FACTS Benchmark SuiteNot measured75.3%Only GPT-6.1 Sol measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index07
Web design benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
Design Arena: websites12741321GPT-6.1 Sol
Design Arena: UI components12801330GPT-6.1 Sol
Design Arena: game dev12781389GPT-6.1 Sol
Design Arena: data viz12511280GPT-6.1 Sol
Design Arena: 3D12611463GPT-6.1 Sol
Design Arena: all code categories12761346GPT-6.1 Sol
Design Arena: SVG1193Not measuredOnly Claude Sonnet 5 measured
Design Arena: ASCII art1207Not measuredOnly Claude Sonnet 5 measured
LiveBench design82.0%82.1%GPT-6.1 Sol
GeneralLike-for-likePublic boards, shown as published, kept out of the index618
General benchmarks for Claude Sonnet 5 and GPT-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
Vals IndexNot measured63.9%Only GPT-6.1 Sol measured
LiveBench data analysis71.7%82.7%GPT-6.1 Sol
Public Benefits Bench (Vals AI)66.0%59.3%Claude Sonnet 5
SAGE (Vals AI)48.9%46.5%Claude Sonnet 5
MedScribe (Vals AI)76.0%86.5%GPT-6.1 Sol
Vals Multimodal Index68.8%Not measuredOnly Claude Sonnet 5 measured
Long context reasoning (AA-LCR)82.0%84.0%GPT-6.1 Sol
DTBench92.5%96.5%GPT-6.1 Sol
LMCA50.0%62.8%GPT-6.1 Sol
Surface Evolver Bench60.0%Not measuredOnly Claude Sonnet 5 measured
Furniture assemblyNot measured80.0%Only GPT-6.1 Sol measured
LMArena Text14421443GPT-6.1 Sol
LMArena Text: instruction following14521466GPT-6.1 Sol
LMArena Text: creative writing14161425GPT-6.1 Sol
LMArena Vision12731288GPT-6.1 Sol
LMArena Text: English14501450GPT-6.1 Sol
LMArena Text: non-English14311433GPT-6.1 Sol
LMArena Text: Chinese14781487GPT-6.1 Sol
LMArena Text: German1442Not measuredOnly Claude Sonnet 5 measured
LMArena Text: Japanese1422Not measuredOnly Claude Sonnet 5 measured
LMArena Text: Korean1412Not measuredOnly Claude Sonnet 5 measured
LMArena Text: French14631460Claude Sonnet 5
LMArena Text: Spanish14381439GPT-6.1 Sol
LMArena Text: Russian14501457GPT-6.1 Sol
LMArena Text: Polish1425Not measuredOnly Claude Sonnet 5 measured
LMArena Text: multi-turn14531442Claude Sonnet 5
LMArena Text: longer queries14621458Claude Sonnet 5
LMArena Text: writing and language14361444GPT-6.1 Sol
LMArena Text: entertainment and media14111426GPT-6.1 Sol
LMArena Vision: English12751274Claude Sonnet 5
LMArena Vision: Chinese1331Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: reading text12881289GPT-6.1 Sol
LMArena Vision: humor1261Not measuredOnly Claude Sonnet 5 measured
LMArena Vision: creative writing12461301GPT-6.1 Sol
LMArena Document1466Not measuredOnly Claude Sonnet 5 measured
Neither model has a result on the other 11 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-6.1 Sol
BenchmarkClaude Sonnet 5GPT-6.1 SolLeader
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-6.1 Sol$0.0070Fits in one request

Same cost

Repository review

50K input + 3K output tokens

Claude Sonnet 5$0.130Fits in one request
GPT-6.1 Sol$0.130Fits in one request

Same cost

Agent loop

200K input + 10K output tokens

Claude Sonnet 5$0.500Fits in one request
GPT-6.1 Sol$0.500Fits in one request

Same cost

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-6.1 Sol
SpecificationAnthropic Claude Sonnet 5OpenAI GPT-6.1 Sol
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedJune 30, 2026September 29, 2026
Context window1M1.05M
Input $/Mtok$2.00$2.00
Output $/Mtok$10.00$10.00
Coding index57.782.4
Independent measurements behind it65
Cost per solved task$1.87Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 5 better than GPT-6.1 Sol for coding?

Pick GPT-6.1 Sol for coding: it scores 82.4 on the Vibe Coding Index against 57.7 for Claude Sonnet 5, though on 5 benchmarks against 6. Pick Claude Sonnet 5 for work measured by CyberBench (Vals AI) or LMArena Text: coding, where it leads.

Which is cheaper, Claude Sonnet 5 or GPT-6.1 Sol?

Claude Sonnet 5 costs $2.00 per million input tokens and $10.00 per million output tokens; GPT-6.1 Sol costs $2.00 and $10.00. Cost per solved task is known for Claude Sonnet 5 only.

Which has the bigger context window, Claude Sonnet 5 or GPT-6.1 Sol?

GPT-6.1 Sol, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 5 vs GPT-6.1 Sol comparison based on?

85 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-6.1 Sol's on 5. Where only one model has a result, the page says so instead of naming a winner.

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