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GPT-6 Luna vs Grok 4.6

Grok 4.6 leads GPT-6 Luna on coding, 65.7 to 57.3 on the Vibe Coding Index, and GPT-6 Luna costs 12.0x less per output token ($0.50 vs $6.00 per million). Updated October 22, 2026; 97 benchmarks have a result for both.

Replace GPT-6 Luna Replace Grok 4.6
GPT-6 LunaOpenAI
Coding
57.3
Overall
59.7
Output $/M
$0.50
18
Grok 4.6xAI
Coding
65.7
Overall
67.4
Output $/M
$6.00
79
vs boards won of 97 shared

GPT-6 Luna or Grok 4.6: which to pick

Pick Grok 4.6 for coding: it scores 65.7 on the Vibe Coding Index against 57.3 for GPT-6 Luna.

Pick GPT-6 Luna for output tokens 12.0x cheaper ($0.50 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).

Model AGPT-6 LunaOpenAI57.3/1005 independent benchmarksNo cost per solved taskModel BGrok 4.6xAI65.7/1006 independent benchmarks$0.82 per solved task
Shared results
97
GPT-6 Luna only
6
Grok 4.6 only
26
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
GPT-6 Luna 57.3 from 5 benchmarks, Grok 4.6 65.7 from 6 benchmarks.
Widest category
Agentic work, 12.7 points apart on average over 14 shared benchmarks.
Widest single gap
LiveBench research: GPT-6 Luna 43.5% against Grok 4.6 84.5%, 41.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Luna $0.50 against Grok 4.6 $6.00 per million output tokens, 12.0x apart.
Context window
GPT-6 Luna takes 1.05M tokens, Grok 4.6 500K.

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
CategoryGPT-6 LunaBarsGrok 4.6Ties
Coding413
Intelligence11
Agentic work311
Reasoning112
Math33
Knowledge06
Web design36
General327
All shared boards1879
CodingLike-for-likeSix of these boards feed the Vibe Coding Index413
Coding benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
LiveBench coding84.5%89.1%Grok 4.6
LMArena WebDev15781617Grok 4.6
AA Coding IndexNot measured76.8Only Grok 4.6 measured
LiveCodeBench (Vals AI)Not measured88.2%Only Grok 4.6 measured
SWE-bench Verified (Vals AI)Not measured95.6%Only Grok 4.6 measured
Terminal-Bench 4 (Vals AI)13.6%17.2%Grok 4.6
Vibe Code Bench (Vals AI)81.7%76.2%GPT-6 Luna
Code migration (Vals AI)42.5%44.6%Grok 4.6
ProgramBench (Vals AI)0.5%1.0%Grok 4.6
IOI (Vals AI)55.6%47.6%GPT-6 Luna
Terminal-Bench 2.1 (Vals AI)73.0%78.3%Grok 4.6
SWE-bench Multimodal (Vals AI)37.5%Not measuredOnly GPT-6 Luna measured
Vibe Code Bench 1-100 (Vals AI)Not measured14.8%Only Grok 4.6 measured
SkillsBench (Vals AI)Not measured55.8%Only Grok 4.6 measured
CyberBench (Vals AI)76.3%67.7%GPT-6 Luna
SciCode54.6%56.5%Grok 4.6
FrontierCode42.4%48.0%Grok 4.6
FrontierSWENot measured25.3%Only Grok 4.6 measured
WeirdMLNot measured67.3%Only Grok 4.6 measured
ALE-Bench1576.91508.1GPT-6 Luna
LMArena Text: coding14371466Grok 4.6
LMArena Text: software and IT14231457Grok 4.6
LMArena WebDev: React15731631Grok 4.6
LMArena WebDev: HTML15951597Grok 4.6
LMArena WebDev: from an image15711603Grok 4.6
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index11
Intelligence benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
AA Intelligence Index38.144.3Grok 4.6
Epoch Capabilities Index156.8156.6GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index311
Agentic work benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
AA Agentic IndexNot measured53.0Only Grok 4.6 measured
Design Arena: agents building web apps11911248Grok 4.6
Design Arena: agents building full-stack apps11581264Grok 4.6
Design Arena: agents building mobile apps11341234Grok 4.6
Design Arena: agents building Android appsNot measured1291Only Grok 4.6 measured
Design Arena: agents building Godot gamesNot measured1276Only Grok 4.6 measured
Design Arena: agents building gamesNot measured1209Only Grok 4.6 measured
Design Arena: HTML slidesNot measured1250Only Grok 4.6 measured
Design Arena: PowerPoint slidesNot measured1237Only Grok 4.6 measured
LiveBench research43.5%84.5%Grok 4.6
LiveBench browser72.0%64.0%GPT-6 Luna
LiveBench long agentic48.1%40.7%GPT-6 Luna
SREBench (Vals AI)2.7%Not measuredOnly GPT-6 Luna measured
Finance Agent (Vals AI)49.9%53.7%Grok 4.6
Tax Agent Bench (Vals AI)19.9%33.1%Grok 4.6
Legal Research Bench (Vals AI)30.3%48.1%Grok 4.6
Harvey's Legal Agent Benchmark (Vals AI)4.2%Not measuredOnly GPT-6 Luna measured
Excel Modeling Benchmark (Vals AI)68.5%62.7%GPT-6 Luna
BioMysteryBench (Vals AI)61.5%72.2%Grok 4.6
Terminal-Bench-Science (Vals AI)4.3%11.4%Grok 4.6
Vals Science Index28.4%38.1%Grok 4.6
Time Horizon Index (Vals AI)Not measured5.8%Only Grok 4.6 measured
APEX-Agents44.3%65.3%Grok 4.6
SpireClimb0.0%Not measuredOnly GPT-6 Luna measured
Vending-Bench 2Not measured$9,047Only Grok 4.6 measured
Neither model has a result on the other 16 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index112
Reasoning benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
GPQA DiamondNot measured94.7%Only Grok 4.6 measured
LiveBench reasoning81.8%91.2%Grok 4.6
MysteryMechanism (Vals AI)19.4%30.6%Grok 4.6
GPQA Diamond (Artificial Analysis run)Not measured94.9%Only Grok 4.6 measured
Humanity's Last Exam (Artificial Analysis run)38.5%44.1%Grok 4.6
GPQA Diamond (Epoch AI run)90.5%94.0%Grok 4.6
ARC-AGI86.7%87.5%Grok 4.6
ARC-AGI-259.3%67.1%Grok 4.6
SimpleBenchNot measured75.9%Only Grok 4.6 measured
Chess puzzles36.0%33.0%GPT-6 Luna
Mystery game puzzles7.0%34.0%Grok 4.6
EBR-benchNot measured30.5%Only Grok 4.6 measured
LMArena Text: hard prompts14101448Grok 4.6
LMArena Text: expert14421469Grok 4.6
LMArena Text: hard prompts in English14101445Grok 4.6
LMArena Vision: diagrams12451285Grok 4.6
LMArena Vision: homework12611283Grok 4.6
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index33
Math benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
OTIS Mock AIME98.9%99.2%Grok 4.6
FrontierMath, tiers 1 to 378.9%66.0%GPT-6 Luna
FrontierMath, tier 456.1%31.7%GPT-6 Luna
ProofBench64.0%51.0%GPT-6 Luna
LMArena Text: math14091417Grok 4.6
LMArena Text: mathematical work14271464Grok 4.6
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index06
Knowledge benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
MMLU ProNot measured89.4%Only Grok 4.6 measured
LegalBench (Vals AI)Not measured86.3%Only Grok 4.6 measured
CorpFin (Vals AI)Not measured66.2%Only Grok 4.6 measured
TaxEval (Vals AI)Not measured71.1%Only Grok 4.6 measured
MortgageTax (Vals AI)Not measured64.2%Only Grok 4.6 measured
MedCode (Vals AI)44.7%44.7%Grok 4.6
SimpleQA Verified41.4%49.3%Grok 4.6
LMArena Text: science13861437Grok 4.6
LMArena Text: medicine and healthcare13521420Grok 4.6
LMArena Text: legal and government14001429Grok 4.6
LMArena Text: business and finance13881416Grok 4.6
FACTS Benchmark Suite63.3%Not measuredOnly GPT-6 Luna measured
Neither model has a result on the other 6 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index36
Web design benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
Design Arena: websites12711289Grok 4.6
Design Arena: UI components12951294GPT-6 Luna
Design Arena: game dev12571296Grok 4.6
Design Arena: data viz12161282Grok 4.6
Design Arena: 3D12181277Grok 4.6
Design Arena: all code categories12701292Grok 4.6
Design Arena: SVG12521240GPT-6 Luna
Design Arena: ASCII art11531279Grok 4.6
LiveBench design82.5%79.8%GPT-6 Luna
GeneralLike-for-likePublic boards, shown as published, kept out of the index327
General benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
Vals Index52.3%Not measuredOnly GPT-6 Luna measured
LiveBench data analysis73.4%75.3%Grok 4.6
Public Benefits Bench (Vals AI)57.6%66.8%Grok 4.6
SAGE (Vals AI)48.1%28.9%GPT-6 Luna
MedScribe (Vals AI)83.7%86.5%Grok 4.6
Long context reasoning (AA-LCR)83.3%81.0%GPT-6 Luna
DTBench90.1%97.3%Grok 4.6
LMCA44.5%48.5%Grok 4.6
Furniture assembly44.2%40.0%GPT-6 Luna
LMArena Text13891429Grok 4.6
LMArena Text: instruction following14081431Grok 4.6
LMArena Text: creative writing13631426Grok 4.6
LMArena Vision12161263Grok 4.6
LMArena Text: English13931433Grok 4.6
LMArena Text: non-English13811420Grok 4.6
LMArena Text: Chinese14271476Grok 4.6
LMArena Text: German13761426Grok 4.6
LMArena Text: Japanese13691378Grok 4.6
LMArena Text: Korean13591391Grok 4.6
LMArena Text: French14081455Grok 4.6
LMArena Text: Spanish13911414Grok 4.6
LMArena Text: Russian13921421Grok 4.6
LMArena Text: Polish13831430Grok 4.6
LMArena Text: multi-turn13921425Grok 4.6
LMArena Text: longer queries14081456Grok 4.6
LMArena Text: writing and language13841429Grok 4.6
LMArena Text: entertainment and media13641421Grok 4.6
LMArena Vision: English12041270Grok 4.6
LMArena Vision: Chinese12661289Grok 4.6
LMArena Vision: reading text12251272Grok 4.6
LMArena Vision: humorNot measured1270Only Grok 4.6 measured
LMArena Vision: creative writing12051262Grok 4.6
LMArena DocumentNot measured1452Only Grok 4.6 measured
Neither model has a result on the other 13 boards here
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
Image generation benchmarks for GPT-6 Luna and Grok 4.6
BenchmarkGPT-6 LunaGrok 4.6Leader
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

GPT-6 Luna$0.0003Fits in one request
Grok 4.6$0.0050Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

GPT-6 Luna$0.0065Fits in one request
Grok 4.6$0.118Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

GPT-6 Luna$0.025Fits in one request
Grok 4.6$0.460Fits 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 GPT-6 Luna and Grok 4.6
SpecificationOpenAI GPT-6 LunaSpaceXAI Grok 4.6
MakerOpenAIxAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 22, 2026August 12, 2026
Context window1.05M500K
Input $/Mtok$0.10$2.00
Output $/Mtok$0.50$6.00
Coding index57.365.7
Independent measurements behind it56
Cost per solved taskNot computable$0.82
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Luna better than Grok 4.6 for coding?

Pick Grok 4.6 for coding: it scores 65.7 on the Vibe Coding Index against 57.3 for GPT-6 Luna. Pick GPT-6 Luna for output tokens 12.0x cheaper ($0.50 vs $6.00 per million) and a larger context window (1.05M against 500K tokens).

Which is cheaper, GPT-6 Luna or Grok 4.6?

GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens; Grok 4.6 costs $2.00 and $6.00. Cost per solved task is known for Grok 4.6 only.

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

GPT-6 Luna, with 1.05M tokens against 500K.

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

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

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<iframe src="https://llmbenchmark.ai/embed/compare/gpt-6-luna-vs-grok-4-6" title="GPT-6 Luna vs Grok 4.6, LLMBenchmark.ai" width="100%" height="360" style="border:0;max-width:100%" loading="lazy"></iframe>
<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-luna-vs-grok-4-6">LLMBenchmark.ai, GPT-6 Luna vs Grok 4.6</a></p>