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Claude Opus 4.6 vs GPT-6 Luna

GPT-6 Luna leads Claude Opus 4.6 on coding, 57.3 to 57.2 on the Vibe Coding Index, and GPT-6 Luna costs 50.0x less per output token ($0.50 vs $25.00 per million). Updated October 22, 2026; 74 benchmarks have a result for both.

Replace Claude Opus 4.6 Replace GPT-6 Luna
Claude Opus 4.6Anthropic
Coding
57.2
Overall
66.0
Output $/M
$25.00
56
GPT-6 LunaOpenAI
Coding
57.3
Overall
59.7
Output $/M
$0.50
18
vs boards won of 74 shared

Claude Opus 4.6 or GPT-6 Luna: which to pick

Claude Opus 4.6 and GPT-6 Luna are level for coding, 57.2 against 57.3 on the Vibe Coding Index, so price and context decide.

Pick Claude Opus 4.6 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads. Pick GPT-6 Luna for output tokens 50.0x cheaper ($0.50 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Model AClaude Opus 4.6Anthropic57.2/1004 independent benchmarks$1.56 per solved taskModel BGPT-6 LunaOpenAI57.3/1005 independent benchmarksNo cost per solved task
Shared results
74
Claude Opus 4.6 only
36
GPT-6 Luna only
29
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 Opus 4.6 57.2 from 4 benchmarks, GPT-6 Luna 57.3 from 5 benchmarks.
Widest category
Knowledge, 16.6 points apart on average over 7 shared benchmarks.
Widest single gap
FrontierMath, tier 4: Claude Opus 4.6 26.8% against GPT-6 Luna 56.1%, 29.3 points apart on a 0 to 100 scale.
Output price
Claude Opus 4.6 $25.00 against GPT-6 Luna $0.50 per million output tokens, 50.0x apart.
Context window
Claude Opus 4.6 takes 1M tokens, GPT-6 Luna 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 Opus 4.6BarsGPT-6 LunaTies
Coding26
Intelligence02
Agentic work40
Reasoning101
Math24
Knowledge61
Web design62
General262
All shared boards5618
CodingLike-for-likeSix of these boards feed the Vibe Coding Index26
Coding benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
SWE-bench Verified75.6%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Multilingual72.0%Not measuredOnly Claude Opus 4.6 measured
LiveBench codingNot measured84.5%Only GPT-6 Luna measured
LMArena WebDev15471578GPT-6 Luna
LiveCodeBench (Vals AI)84.7%Not measuredOnly Claude Opus 4.6 measured
SWE-bench Verified (Vals AI)78.2%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench 4 (Vals AI)Not measured13.6%Only GPT-6 Luna measured
Vibe Code Bench (Vals AI)57.6%81.7%GPT-6 Luna
Code migration (Vals AI)Not measured42.5%Only GPT-6 Luna measured
ProgramBench (Vals AI)Not measured0.5%Only GPT-6 Luna measured
IOI (Vals AI)Not measured55.6%Only GPT-6 Luna measured
Terminal-Bench 2.1 (Vals AI)Not measured73.0%Only GPT-6 Luna measured
SWE-bench Multimodal (Vals AI)Not measured37.5%Only GPT-6 Luna measured
CyberBench (Vals AI)Not measured76.3%Only GPT-6 Luna measured
SciCodeNot measured54.6%Only GPT-6 Luna measured
Terminal-Bench Hard (Artificial Analysis run)48.5%Not measuredOnly Claude Opus 4.6 measured
Terminal-Bench79.8%Not measuredOnly Claude Opus 4.6 measured
FrontierCode26.6%42.4%GPT-6 Luna
GSO-Bench41.2%Not measuredOnly Claude Opus 4.6 measured
WeirdML78.0%Not measuredOnly Claude Opus 4.6 measured
Cybench93.0%Not measuredOnly Claude Opus 4.6 measured
ALE-BenchNot measured1576.9Only GPT-6 Luna measured
LMArena Text: coding15341437Claude Opus 4.6
LMArena Text: software and IT15271423Claude Opus 4.6
LMArena WebDev: React15391573GPT-6 Luna
LMArena WebDev: HTML15591595GPT-6 Luna
LMArena WebDev: from an image15431571GPT-6 Luna
Neither model has a result on the other 12 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index02
Intelligence benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
AA Intelligence Index31.938.1GPT-6 Luna
Epoch Capabilities Index155.7156.8GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index40
Agentic work benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
Design Arena: agents building web apps12061191Claude Opus 4.6
Design Arena: agents building full-stack apps12201158Claude Opus 4.6
Design Arena: agents building mobile apps12071134Claude Opus 4.6
Design Arena: agents building Android apps1197Not measuredOnly Claude Opus 4.6 measured
Design Arena: agents building games1212Not measuredOnly Claude Opus 4.6 measured
LiveBench researchNot measured43.5%Only GPT-6 Luna measured
LiveBench browserNot measured72.0%Only GPT-6 Luna measured
LiveBench long agenticNot measured48.1%Only GPT-6 Luna measured
SREBench (Vals AI)Not measured2.7%Only GPT-6 Luna measured
Finance Agent (Vals AI)Not measured49.9%Only GPT-6 Luna measured
Tax Agent Bench (Vals AI)Not measured19.9%Only GPT-6 Luna measured
Legal Research Bench (Vals AI)Not measured30.3%Only GPT-6 Luna measured
Harvey's Legal Agent Benchmark (Vals AI)Not measured4.2%Only GPT-6 Luna measured
Excel Modeling Benchmark (Vals AI)Not measured68.5%Only GPT-6 Luna measured
BioMysteryBench (Vals AI)Not measured61.5%Only GPT-6 Luna measured
Terminal-Bench-Science (Vals AI)Not measured4.3%Only GPT-6 Luna measured
Vals Science IndexNot measured28.4%Only GPT-6 Luna measured
τ²-Bench Telecom92.1%Not measuredOnly Claude Opus 4.6 measured
APEX-Agents46.3%44.3%Claude Opus 4.6
METR time horizons78.9%Not measuredOnly Claude Opus 4.6 measured
Remote Labor Index4.2%Not measuredOnly Claude Opus 4.6 measured
DeepResearch Bench55.3%Not measuredOnly Claude Opus 4.6 measured
SpireClimbNot measured0.0%Only GPT-6 Luna measured
Vending-Bench 2$8,018Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 17 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index101
Reasoning benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
GPQA Diamond89.7%Not measuredOnly Claude Opus 4.6 measured
LiveBench reasoningNot measured81.8%Only GPT-6 Luna measured
MysteryMechanism (Vals AI)Not measured19.4%Only GPT-6 Luna measured
MMMU Pro (Vals AI)83.9%Not measuredOnly Claude Opus 4.6 measured
GPQA Diamond (Artificial Analysis run)89.6%Not measuredOnly Claude Opus 4.6 measured
Humanity's Last Exam (Artificial Analysis run)39.9%38.5%Claude Opus 4.6
GPQA Diamond (Epoch AI run)90.5%90.5%Claude Opus 4.6
ARC-AGI94.0%86.7%Claude Opus 4.6
ARC-AGI-269.2%59.3%Claude Opus 4.6
SimpleBench67.6%Not measuredOnly Claude Opus 4.6 measured
Chess puzzles21.0%36.0%GPT-6 Luna
Mystery game puzzles25.0%7.0%Claude Opus 4.6
EBR-bench12.7%Not measuredOnly Claude Opus 4.6 measured
LMArena Text: hard prompts15251410Claude Opus 4.6
LMArena Text: expert15441442Claude Opus 4.6
LMArena Text: hard prompts in English15301410Claude Opus 4.6
LMArena Vision: diagrams13401245Claude Opus 4.6
LMArena Vision: homework13371261Claude Opus 4.6
Kagi LLM Benchmark83.6%Not measuredOnly Claude Opus 4.6 measured
Neither model has a result on the other 3 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index24
Math benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
AIME95.6%Not measuredOnly Claude Opus 4.6 measured
OTIS Mock AIME94.4%98.9%GPT-6 Luna
FrontierMath, tiers 1 to 366.0%78.9%GPT-6 Luna
FrontierMath, tier 426.8%56.1%GPT-6 Luna
ProofBench50.0%64.0%GPT-6 Luna
LMArena Text: math15181409Claude Opus 4.6
LMArena Text: mathematical work15251427Claude Opus 4.6
Neither model has a result on the other 6 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index61
Knowledge benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
MMLU Pro89.1%Not measuredOnly Claude Opus 4.6 measured
LegalBench (Vals AI)85.3%Not measuredOnly Claude Opus 4.6 measured
CaseLaw (Vals AI)62.1%Not measuredOnly Claude Opus 4.6 measured
CorpFin (Vals AI)67.0%Not measuredOnly Claude Opus 4.6 measured
TaxEval (Vals AI)76.0%Not measuredOnly Claude Opus 4.6 measured
MortgageTax (Vals AI)68.5%Not measuredOnly Claude Opus 4.6 measured
MedQA (Vals AI)95.4%Not measuredOnly Claude Opus 4.6 measured
MedCode (Vals AI)49.1%44.7%Claude Opus 4.6
SimpleQA Verified47.0%41.4%Claude Opus 4.6
LMArena Text: science15191386Claude Opus 4.6
LMArena Text: medicine and healthcare15041352Claude Opus 4.6
LMArena Text: legal and government15121400Claude Opus 4.6
LMArena Text: business and finance14971388Claude Opus 4.6
FACTS Benchmark Suite41.5%63.3%GPT-6 Luna
Neither model has a result on the other 4 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index62
Web design benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
Design Arena: websites12911271Claude Opus 4.6
Design Arena: UI components12811295GPT-6 Luna
Design Arena: game dev12771257Claude Opus 4.6
Design Arena: data viz12791216Claude Opus 4.6
Design Arena: 3D12731218Claude Opus 4.6
Design Arena: all code categories12881270Claude Opus 4.6
Design Arena: SVG12271252GPT-6 Luna
Design Arena: ASCII art12551153Claude Opus 4.6
LiveBench designNot measured82.5%Only GPT-6 Luna measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index262
General benchmarks for Claude Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
Vals IndexNot measured52.3%Only GPT-6 Luna measured
LiveBench data analysisNot measured73.4%Only GPT-6 Luna measured
Public Benefits Bench (Vals AI)Not measured57.6%Only GPT-6 Luna measured
SAGE (Vals AI)51.6%48.1%Claude Opus 4.6
MedScribe (Vals AI)86.7%83.7%Claude Opus 4.6
IFBench53.1%Not measuredOnly Claude Opus 4.6 measured
Long context reasoning (AA-LCR)78.0%83.3%GPT-6 Luna
DTBench91.2%90.1%Claude Opus 4.6
LMCA55.8%44.5%Claude Opus 4.6
CL-bench20.7%Not measuredOnly Claude Opus 4.6 measured
Furniture assembly28.3%44.2%GPT-6 Luna
CL-bench Life17.0%Not measuredOnly Claude Opus 4.6 measured
LMArena Text15011389Claude Opus 4.6
LMArena Text: instruction following15211408Claude Opus 4.6
LMArena Text: creative writing15051363Claude Opus 4.6
LMArena Vision13161216Claude Opus 4.6
LMArena Text: English15111393Claude Opus 4.6
LMArena Text: non-English14881381Claude Opus 4.6
LMArena Text: Chinese15511427Claude Opus 4.6
LMArena Text: German15001376Claude Opus 4.6
LMArena Text: Japanese14881369Claude Opus 4.6
LMArena Text: Korean14641359Claude Opus 4.6
LMArena Text: French15121408Claude Opus 4.6
LMArena Text: Spanish15101391Claude Opus 4.6
LMArena Text: Russian14971392Claude Opus 4.6
LMArena Text: Polish14991383Claude Opus 4.6
LMArena Text: multi-turn15111392Claude Opus 4.6
LMArena Text: longer queries15181408Claude Opus 4.6
LMArena Text: writing and language15021384Claude Opus 4.6
LMArena Text: entertainment and media14921364Claude Opus 4.6
LMArena Vision: English13241204Claude Opus 4.6
LMArena Vision: Chinese13701266Claude Opus 4.6
LMArena Vision: reading text13261225Claude Opus 4.6
LMArena Vision: humor1314Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: recognizing things1274Not measuredOnly Claude Opus 4.6 measured
LMArena Vision: creative writing13311205Claude Opus 4.6
LMArena Document1507Not measuredOnly Claude Opus 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 Opus 4.6 and GPT-6 Luna
BenchmarkClaude Opus 4.6GPT-6 LunaLeader
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 Opus 4.6$0.018Fits in one request
GPT-6 Luna$0.0003Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

Claude Opus 4.6$0.325Fits in one request
GPT-6 Luna$0.0065Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

Claude Opus 4.6$1.25Fits in one request
GPT-6 Luna$0.025Fits in one request

GPT-6 Luna 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 Opus 4.6 and GPT-6 Luna
SpecificationAnthropic Claude Opus 4.6OpenAI GPT-6 Luna
MakerAnthropicOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedFebruary 4, 2026September 22, 2026
Context window1M1.05M
Input $/Mtok$5.00$0.10
Output $/Mtok$25.00$0.50
Coding index57.257.3
Independent measurements behind it45
Cost per solved task$1.56Not computable
SourceOpenRouter listingOpenRouter listing

Questions

Is Claude Opus 4.6 better than GPT-6 Luna for coding?

Claude Opus 4.6 and GPT-6 Luna are level for coding, 57.2 against 57.3 on the Vibe Coding Index, so price and context decide. Pick Claude Opus 4.6 for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads. Pick GPT-6 Luna for output tokens 50.0x cheaper ($0.50 vs $25.00 per million) and a larger context window (1.05M against 1M tokens).

Which is cheaper, Claude Opus 4.6 or GPT-6 Luna?

Claude Opus 4.6 costs $5.00 per million input tokens and $25.00 per million output tokens; GPT-6 Luna costs $0.10 and $0.50. Cost per solved task is known for Claude Opus 4.6 only.

Which has the bigger context window, Claude Opus 4.6 or GPT-6 Luna?

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

How many benchmarks is the Claude Opus 4.6 vs GPT-6 Luna comparison based on?

74 benchmarks have a result for both models as of October 22, 2026. Claude Opus 4.6's coding index rests on 4 independent benchmarks and GPT-6 Luna's on 5. Where only one model has a result, the page says so instead of naming a winner.

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