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Claude Sonnet 4.6 vs GPT-6 Astra

Updated October 21, 2026. 89 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace Claude Sonnet 4.6 Replace GPT-6 Astra
Claude Sonnet 4.6Anthropic
Coding
57.8
Overall
30.1
Output $/M
$15.00
30
GPT-6 AstraOpenAI
Coding
88.7
Overall
52.7
Output $/M
$50.00
59
vs boards won of 89 shared

Decision reading

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 57.8 for Claude Sonnet 4.6.

Pick Claude Sonnet 4.6 when output tokens cost 3.3x less, or when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AClaude Sonnet 4.6Anthropic57.8/1002 independent benchmarks$1.68 per solved taskModel BGPT-6 AstraOpenAI88.7/1002 independent benchmarksNo cost per solved task
Shared results
89
Claude Sonnet 4.6 only
28
GPT-6 Astra only
30
Like-for-like categories
8 of 9

Shared results can support a head-to-head reading. Results only one model has describe coverage, not superiority.

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 4.6 57.8 from 2 benchmarks, GPT-6 Astra 88.7 from 2 benchmarks.
Widest category
Intelligence, 21.3 points apart on average over 2 shared benchmarks.
Widest single gap
Mystery game puzzles: Claude Sonnet 4.6 16.0% against GPT-6 Astra 84.0%, 68.0 points apart on a 0 to 100 scale.
Output price
Claude Sonnet 4.6 $15.00 against GPT-6 Astra $50.00 per million output tokens, 3.3x apart.
Context window
Claude Sonnet 4.6 takes 1M tokens, GPT-6 Astra 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 4.6BarsGPT-6 AstraTies
Coding213
Intelligence02
Agentic work113
Reasoning49
Math04
Knowledge41
Web design09
General198
All shared boards3059
CodingLike-for-likeFour of these boards feed the Vibe Coding Index213
Coding benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
LiveBench coding66.6%93.7%GPT-6 Astra
LMArena WebDev15231774GPT-6 Astra
AA Coding Index63.076.9GPT-6 Astra
LiveCodeBench (Vals AI)82.1%Not measuredOnly Claude Sonnet 4.6 measured
SWE-bench Verified (Vals AI)77.4%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench 4 (Vals AI)Not measured59.6%Only GPT-6 Astra measured
Vibe Code Bench (Vals AI)55.8%89.6%GPT-6 Astra
Code migration (Vals AI)39.9%67.7%GPT-6 Astra
ProgramBench (Vals AI)0.5%5.5%GPT-6 Astra
IOI (Vals AI)Not measured100.0%Only GPT-6 Astra measured
Terminal-Bench 2.1 (Vals AI)57.3%87.3%GPT-6 Astra
SWE-bench Multimodal (Vals AI)Not measured43.3%Only GPT-6 Astra measured
Vibe Code Bench 1-100 (Vals AI)Not measured27.6%Only GPT-6 Astra measured
SkillsBench (Vals AI)49.0%Not measuredOnly Claude Sonnet 4.6 measured
CyberBench (Vals AI)Not measured41.1%Only GPT-6 Astra measured
SciCode50.1%56.5%GPT-6 Astra
Terminal-Bench Hard (Artificial Analysis run)53.0%Not measuredOnly Claude Sonnet 4.6 measured
Terminal-Bench53.4%Not measuredOnly Claude Sonnet 4.6 measured
FrontierCode24.3%53.3%GPT-6 Astra
FrontierSWENot measured65.5%Only GPT-6 Astra measured
GSO-BenchNot measured79.4%Only GPT-6 Astra measured
WeirdML66.1%93.3%GPT-6 Astra
MirrorCodeNot measured46.7%Only GPT-6 Astra measured
ALE-BenchNot measured2951.3Only GPT-6 Astra measured
LMArena Text: coding15031489Claude Sonnet 4.6
LMArena Text: software and IT14911474Claude Sonnet 4.6
LMArena WebDev: React15121798GPT-6 Astra
LMArena WebDev: HTML15271775GPT-6 Astra
LMArena WebDev: from an image15291726GPT-6 Astra
Neither model has a result on the other 9 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
AA Intelligence Index30.152.7GPT-6 Astra
Epoch Capabilities Index152.8168.8GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index113
Agentic work benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
AA Agentic Index31.851.0GPT-6 Astra
Design Arena: agents building web apps11901372GPT-6 Astra
Design Arena: agents building full-stack apps12131357GPT-6 Astra
Design Arena: agents building mobile apps12121312GPT-6 Astra
Design Arena: agents building Android apps1202Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: agents building Godot games12261348GPT-6 Astra
Design Arena: agents building games1177Not measuredOnly Claude Sonnet 4.6 measured
Design Arena: PowerPoint slidesNot measured1245Only GPT-6 Astra measured
Design Arena: spreadsheetsNot measured1380Only GPT-6 Astra measured
LiveBench research63.6%85.2%GPT-6 Astra
LiveBench browser68.0%84.0%GPT-6 Astra
LiveBench long agentic23.1%82.4%GPT-6 Astra
SREBench (Vals AI)Not measured56.9%Only GPT-6 Astra measured
Finance Agent (Vals AI)51.0%53.5%GPT-6 Astra
Tax Agent Bench (Vals AI)25.8%20.7%Claude Sonnet 4.6
Legal Research Bench (Vals AI)38.5%39.4%GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)Not measured7.1%Only GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)60.2%71.7%GPT-6 Astra
BioMysteryBench (Vals AI)Not measured79.3%Only GPT-6 Astra measured
Terminal-Bench-Science (Vals AI)Not measured62.9%Only GPT-6 Astra measured
Vals Science IndexNot measured65.1%Only GPT-6 Astra measured
Time Horizon Index (Vals AI)Not measured90.5%Only GPT-6 Astra measured
CUA-bench (Vals AI)Not measured19.2%Only GPT-6 Astra measured
Robo-bench (Vals AI)Not measured23.3%Only GPT-6 Astra measured
τ²-Bench Telecom79.5%Not measuredOnly Claude Sonnet 4.6 measured
APEX-Agents43.0%64.7%GPT-6 Astra
Remote Labor IndexNot measured20.8%Only GPT-6 Astra measured
OSWorld 2.09.3%Not measuredOnly Claude Sonnet 4.6 measured
BALROGNot measured68.3%Only GPT-6 Astra measured
DeepResearch Bench54.9%Not measuredOnly Claude Sonnet 4.6 measured
OSWorld72.1%Not measuredOnly Claude Sonnet 4.6 measured
SpireClimbNot measured25.7%Only GPT-6 Astra measured
Vending-Bench 2$7,204$15,515GPT-6 Astra
Neither model has a result on the other 6 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index49
Reasoning benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
GPQA Diamond85.6%Not measuredOnly Claude Sonnet 4.6 measured
LiveBench reasoning86.4%92.7%GPT-6 Astra
MysteryMechanism (Vals AI)Not measured53.1%Only GPT-6 Astra measured
MMMU Pro (Vals AI)83.6%Not measuredOnly Claude Sonnet 4.6 measured
GPQA Diamond (Artificial Analysis run)87.5%96.3%GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)33.6%54.7%GPT-6 Astra
GPQA Diamond (Epoch AI run)87.4%95.8%GPT-6 Astra
ARC-AGI86.5%98.5%GPT-6 Astra
ARC-AGI-260.4%95.0%GPT-6 Astra
Chess puzzles23.0%74.0%GPT-6 Astra
Mystery game puzzles16.0%84.0%GPT-6 Astra
EBR-benchNot measured76.2%Only GPT-6 Astra measured
LMArena Text: hard prompts14851463Claude Sonnet 4.6
LMArena Text: expert15001489Claude Sonnet 4.6
LMArena Text: hard prompts in English14931464Claude Sonnet 4.6
LMArena Vision: diagrams13061297Claude Sonnet 4.6
LMArena Vision: homework13111337GPT-6 Astra
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index04
Math benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
AIME92.3%Not measuredOnly Claude Sonnet 4.6 measured
OTIS Mock AIME85.8%100.0%GPT-6 Astra
FrontierMath, tiers 1 to 3Not measured93.7%Only GPT-6 Astra measured
FrontierMath, tier 4Not measured97.6%Only GPT-6 Astra measured
ProofBench45.0%99.0%GPT-6 Astra
LMArena Text: math14621465GPT-6 Astra
LMArena Text: mathematical work14831484GPT-6 Astra
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index41
Knowledge benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
MMLU Pro87.3%Not measuredOnly Claude Sonnet 4.6 measured
LegalBench (Vals AI)82.1%Not measuredOnly Claude Sonnet 4.6 measured
CaseLaw (Vals AI)64.0%Not measuredOnly Claude Sonnet 4.6 measured
CorpFin (Vals AI)65.3%Not measuredOnly Claude Sonnet 4.6 measured
TaxEval (Vals AI)77.1%Not measuredOnly Claude Sonnet 4.6 measured
MortgageTax (Vals AI)67.7%Not measuredOnly Claude Sonnet 4.6 measured
MedQA (Vals AI)92.1%Not measuredOnly Claude Sonnet 4.6 measured
MedCode (Vals AI)Not measured48.5%Only GPT-6 Astra measured
SimpleQA Verified35.5%75.6%GPT-6 Astra
LMArena Text: science14741451Claude Sonnet 4.6
LMArena Text: medicine and healthcare14511425Claude Sonnet 4.6
LMArena Text: legal and government14701462Claude Sonnet 4.6
LMArena Text: business and finance14641439Claude Sonnet 4.6
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index09
Web design benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
Design Arena: websites12851337GPT-6 Astra
Design Arena: UI components12711394GPT-6 Astra
Design Arena: game dev12591474GPT-6 Astra
Design Arena: data viz12781335GPT-6 Astra
Design Arena: 3D12341501GPT-6 Astra
Design Arena: all code categories12761379GPT-6 Astra
Design Arena: SVG11961431GPT-6 Astra
Design Arena: ASCII art12351359GPT-6 Astra
LiveBench design71.8%82.0%GPT-6 Astra
GeneralLike-for-likePublic boards, shown as published, kept out of the index198
General benchmarks for Claude Sonnet 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
Vals IndexNot measured65.0%Only GPT-6 Astra measured
LiveBench data analysis76.1%83.0%GPT-6 Astra
Public Benefits Bench (Vals AI)62.5%Not measuredOnly Claude Sonnet 4.6 measured
SAGE (Vals AI)46.6%46.4%Claude Sonnet 4.6
MedScribe (Vals AI)Not measured87.9%Only GPT-6 Astra measured
Vals Multimodal Index60.6%Not measuredOnly Claude Sonnet 4.6 measured
IFBench56.6%Not measuredOnly Claude Sonnet 4.6 measured
Long context reasoning (AA-LCR)80.0%80.7%GPT-6 Astra
DTBench89.9%97.3%GPT-6 Astra
LMCA46.5%64.4%GPT-6 Astra
Furniture assemblyNot measured80.0%Only GPT-6 Astra measured
ExploitBench23.6%Not measuredOnly Claude Sonnet 4.6 measured
LMArena Text14581441Claude Sonnet 4.6
LMArena Text: instruction following14761455Claude Sonnet 4.6
LMArena Text: creative writing14351420Claude Sonnet 4.6
LMArena Vision12831280Claude Sonnet 4.6
LMArena Text: English14721447Claude Sonnet 4.6
LMArena Text: non-English14401432Claude Sonnet 4.6
LMArena Text: Chinese14911489Claude Sonnet 4.6
LMArena Text: German14281459GPT-6 Astra
LMArena Text: Japanese14201405Claude Sonnet 4.6
LMArena Text: Korean14101428GPT-6 Astra
LMArena Text: French14651432Claude Sonnet 4.6
LMArena Text: Spanish14641422Claude Sonnet 4.6
LMArena Text: Russian14401438Claude Sonnet 4.6
LMArena Text: Polish14431422Claude Sonnet 4.6
LMArena Text: multi-turn14641447Claude Sonnet 4.6
LMArena Text: longer queries14791460Claude Sonnet 4.6
LMArena Text: writing and language14441437Claude Sonnet 4.6
LMArena Text: entertainment and media14311427Claude Sonnet 4.6
LMArena Vision: English12981280Claude Sonnet 4.6
LMArena Vision: Chinese13071361GPT-6 Astra
LMArena Vision: reading text12961292Claude Sonnet 4.6
LMArena Vision: humor1248Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: recognizing things1195Not measuredOnly Claude Sonnet 4.6 measured
LMArena Vision: creative writing12721286GPT-6 Astra
LMArena Document1482Not measuredOnly Claude Sonnet 4.6 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 4.6 and GPT-6 Astra
BenchmarkClaude Sonnet 4.6GPT-6 AstraLeader
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 4.6$0.011Fits in one request
GPT-6 Astra$0.035Fits in one request

Claude Sonnet 4.6 costs less

Repository review

50K input + 3K output tokens

Claude Sonnet 4.6$0.195Fits in one request
GPT-6 Astra$0.650Fits in one request

Claude Sonnet 4.6 costs less

Agent loop

200K input + 10K output tokens

Claude Sonnet 4.6$0.750Fits in one request
GPT-6 Astra$2.50Fits in one request

Claude Sonnet 4.6 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 4.6 and GPT-6 Astra
SpecificationAnthropic Claude Sonnet 4.6OpenAI GPT-6 Astra
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 17, 2026September 4, 2026
Context window1M1.05M
Input $/Mtok$3.00$10.00
Output $/Mtok$15.00$50.00
Coding index57.888.7
Independent measurements behind it22
Cost per solved task$1.68Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Sonnet 4.6 better than GPT-6 Astra for coding?

Pick GPT-6 Astra for coding: it scores 88.7 on the Vibe Coding Index against 57.8 for Claude Sonnet 4.6. Pick Claude Sonnet 4.6 when output tokens cost 3.3x less, or when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, Claude Sonnet 4.6 or GPT-6 Astra?

Claude Sonnet 4.6 costs $3.00 per million input tokens and $15.00 per million output tokens; GPT-6 Astra costs $10.00 and $50.00. Cost per solved task is known for Claude Sonnet 4.6 only.

Which has the bigger context window, Claude Sonnet 4.6 or GPT-6 Astra?

GPT-6 Astra, with 1.05M tokens against 1M.

How many benchmarks is the Claude Sonnet 4.6 vs GPT-6 Astra comparison based on?

89 benchmarks have a result for both models as of October 21, 2026. Claude Sonnet 4.6's coding index rests on 2 independent benchmarks and GPT-6 Astra's on 2. Where only one model has a result, the page says so instead of naming a winner.

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