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GPT-6 Luna vs Inkling

GPT-6 Luna leads Inkling on coding, 57.3 to 31.5 on the Vibe Coding Index, and GPT-6 Luna costs 8.1x less per output token ($0.50 vs $4.05 per million). Updated October 22, 2026; 84 benchmarks have a result for both.

Replace GPT-6 Luna Replace Inkling
GPT-6 LunaOpenAI
Coding
57.3
Overall
59.7
Output $/M
$0.50
52
T InklingThinking Machines
Coding
31.5
Overall
46.5
Output $/M
$4.05
32
vs boards won of 84 shared

GPT-6 Luna or Inkling: which to pick

Pick GPT-6 Luna for coding: it scores 57.3 on the Vibe Coding Index against 31.5 for Inkling, though on 5 benchmarks against 6.

Pick Inkling for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGPT-6 LunaOpenAI57.3/1005 independent benchmarksNo cost per solved taskModel BInklingThinking Machines31.5/1006 independent benchmarks$0.76 per solved task
Shared results
84
GPT-6 Luna only
19
Inkling only
18
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, Inkling 31.5 from 6 benchmarks.
Widest category
Math, 31.3 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-6 Luna 64.0% against Inkling 0.0%, 64.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Luna $0.50 against Inkling $4.05 per million output tokens, 8.1x apart.
Context window
GPT-6 Luna takes 1.05M tokens, Inkling 524K.

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 LunaBarsInklingTies
Coding142
Intelligence20
Agentic work92
Reasoning63
Math42
Knowledge24
Web design90
General619
All shared boards5232
CodingLike-for-likeSix of these boards feed the Vibe Coding Index142
Coding benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
LiveBench coding84.5%64.0%GPT-6 Luna
LMArena WebDev15781414GPT-6 Luna
AA Coding IndexNot measured52.1Only Inkling measured
LiveCodeBench (Vals AI)Not measured85.5%Only Inkling measured
SWE-bench Verified (Vals AI)Not measured77.6%Only Inkling measured
Terminal-Bench 4 (Vals AI)13.6%0.5%GPT-6 Luna
Vibe Code Bench (Vals AI)81.7%19.2%GPT-6 Luna
Code migration (Vals AI)42.5%11.8%GPT-6 Luna
ProgramBench (Vals AI)0.5%0.0%GPT-6 Luna
IOI (Vals AI)55.6%14.9%GPT-6 Luna
Terminal-Bench 2.1 (Vals AI)73.0%47.6%GPT-6 Luna
SWE-bench Multimodal (Vals AI)37.5%Not measuredOnly GPT-6 Luna measured
Vibe Code Bench 1-100 (Vals AI)Not measured7.3%Only Inkling measured
SkillsBench (Vals AI)Not measured26.1%Only Inkling measured
CyberBench (Vals AI)76.3%66.8%GPT-6 Luna
SciCode54.6%47.0%GPT-6 Luna
FrontierCode42.4%14.0%GPT-6 Luna
FrontierSWENot measured4.1%Only Inkling measured
WeirdMLNot measured32.3%Only Inkling measured
ALE-Bench1576.9946.0GPT-6 Luna
LMArena Text: coding14371466Inkling
LMArena Text: software and IT14231465Inkling
LMArena WebDev: React15731404GPT-6 Luna
LMArena WebDev: HTML15951399GPT-6 Luna
LMArena WebDev: from an image1571Not measuredOnly GPT-6 Luna measured
Neither model has a result on the other 14 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
AA Intelligence Index38.125.0GPT-6 Luna
Epoch Capabilities Index156.8148.4GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index92
Agentic work benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
AA Agentic IndexNot measured22.5Only Inkling measured
Design Arena: agents building web apps11911196Inkling
Design Arena: agents building full-stack apps1158Not measuredOnly GPT-6 Luna measured
Design Arena: agents building mobile apps1134Not measuredOnly GPT-6 Luna measured
LiveBench research43.5%59.9%Inkling
LiveBench browser72.0%16.0%GPT-6 Luna
LiveBench long agentic48.1%14.1%GPT-6 Luna
SREBench (Vals AI)2.7%0.0%GPT-6 Luna
Finance Agent (Vals AI)49.9%46.6%GPT-6 Luna
Tax Agent Bench (Vals AI)19.9%15.3%GPT-6 Luna
Legal Research Bench (Vals AI)30.3%28.4%GPT-6 Luna
Harvey's Legal Agent Benchmark (Vals AI)4.2%3.8%GPT-6 Luna
Excel Modeling Benchmark (Vals AI)68.5%38.4%GPT-6 Luna
BioMysteryBench (Vals AI)61.5%Not measuredOnly GPT-6 Luna measured
Terminal-Bench-Science (Vals AI)4.3%Not measuredOnly GPT-6 Luna measured
Vals Science Index28.4%Not measuredOnly GPT-6 Luna measured
APEX-Agents44.3%33.8%GPT-6 Luna
SpireClimb0.0%Not measuredOnly GPT-6 Luna measured
Neither model has a result on the other 23 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index63
Reasoning benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
GPQA DiamondNot measured87.1%Only Inkling measured
LiveBench reasoning81.8%78.3%GPT-6 Luna
MysteryMechanism (Vals AI)19.4%Not measuredOnly GPT-6 Luna measured
MMMU Pro (Vals AI)Not measured78.5%Only Inkling measured
GPQA Diamond (Artificial Analysis run)Not measured87.2%Only Inkling measured
Humanity's Last Exam (Artificial Analysis run)38.5%31.9%GPT-6 Luna
GPQA Diamond (Epoch AI run)90.5%88.3%GPT-6 Luna
ARC-AGI86.7%79.5%GPT-6 Luna
ARC-AGI-259.3%36.5%GPT-6 Luna
SimpleBenchNot measured50.0%Only Inkling measured
Chess puzzles36.0%21.0%GPT-6 Luna
Mystery game puzzles7.0%Not measuredOnly GPT-6 Luna measured
LMArena Text: hard prompts14101451Inkling
LMArena Text: expert14421466Inkling
LMArena Text: hard prompts in English14101448Inkling
LMArena Vision: diagrams1245Not measuredOnly GPT-6 Luna measured
LMArena Vision: homework1261Not measuredOnly GPT-6 Luna measured
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
OTIS Mock AIME98.9%88.9%GPT-6 Luna
FrontierMath, tiers 1 to 378.9%33.3%GPT-6 Luna
FrontierMath, tier 456.1%4.9%GPT-6 Luna
ProofBench64.0%0.0%GPT-6 Luna
LMArena Text: math14091479Inkling
LMArena Text: mathematical work14271460Inkling
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 GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
MMLU ProNot measured86.3%Only Inkling measured
LegalBench (Vals AI)Not measured83.0%Only Inkling measured
CorpFin (Vals AI)Not measured68.6%Only Inkling measured
TaxEval (Vals AI)Not measured75.3%Only Inkling measured
MortgageTax (Vals AI)Not measured64.0%Only Inkling measured
MedCode (Vals AI)44.7%41.2%GPT-6 Luna
SimpleQA Verified41.4%40.3%GPT-6 Luna
LMArena Text: science13861455Inkling
LMArena Text: medicine and healthcare13521447Inkling
LMArena Text: legal and government14001448Inkling
LMArena Text: business and finance13881438Inkling
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 index90
Web design benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
Design Arena: websites12711224GPT-6 Luna
Design Arena: UI components12951198GPT-6 Luna
Design Arena: game dev12571165GPT-6 Luna
Design Arena: data viz12161156GPT-6 Luna
Design Arena: 3D12181160GPT-6 Luna
Design Arena: all code categories12701205GPT-6 Luna
Design Arena: SVG12521108GPT-6 Luna
Design Arena: ASCII art11531089GPT-6 Luna
LiveBench design82.5%58.3%GPT-6 Luna
GeneralLike-for-likePublic boards, shown as published, kept out of the index619
General benchmarks for GPT-6 Luna and Inkling
BenchmarkGPT-6 LunaInklingLeader
Vals Index52.3%29.0%GPT-6 Luna
LiveBench data analysis73.4%72.8%GPT-6 Luna
Public Benefits Bench (Vals AI)57.6%58.5%Inkling
SAGE (Vals AI)48.1%36.5%GPT-6 Luna
MedScribe (Vals AI)83.7%85.4%Inkling
Vals Multimodal IndexNot measured49.4%Only Inkling measured
Long context reasoning (AA-LCR)83.3%77.3%GPT-6 Luna
DTBench90.1%87.5%GPT-6 Luna
LMCA44.5%37.6%GPT-6 Luna
Furniture assembly44.2%Not measuredOnly GPT-6 Luna measured
LMArena Text13891442Inkling
LMArena Text: instruction following14081425Inkling
LMArena Text: creative writing13631390Inkling
LMArena Vision1216Not measuredOnly GPT-6 Luna measured
LMArena Text: English13931442Inkling
LMArena Text: non-English13811434Inkling
LMArena Text: Chinese14271493Inkling
LMArena Text: German13761445Inkling
LMArena Text: Japanese13691429Inkling
LMArena Text: Korean13591403Inkling
LMArena Text: French14081455Inkling
LMArena Text: Spanish13911449Inkling
LMArena Text: Russian13921430Inkling
LMArena Text: Polish13831450Inkling
LMArena Text: multi-turn13921437Inkling
LMArena Text: longer queries14081435Inkling
LMArena Text: writing and language13841404Inkling
LMArena Text: entertainment and media13641394Inkling
LMArena Vision: English1204Not measuredOnly GPT-6 Luna measured
LMArena Vision: Chinese1266Not measuredOnly GPT-6 Luna measured
LMArena Vision: reading text1225Not measuredOnly GPT-6 Luna measured
LMArena Vision: creative writing1205Not measuredOnly GPT-6 Luna measured
Neither model has a result on the other 14 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 Inkling
BenchmarkGPT-6 LunaInklingLeader
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
Inkling$0.0030Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

GPT-6 Luna$0.0065Fits in one request
Inkling$0.061Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

GPT-6 Luna$0.025Fits in one request
Inkling$0.235Fits 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 Inkling
SpecificationOpenAI GPT-6 LunaThinking Machines Inkling
MakerOpenAIThinking Machines
WeightsNo public weights listedOpen weights
ReleasedSeptember 22, 2026July 17, 2026
Context window1.05M524K
Input $/Mtok$0.10$0.975
Output $/Mtok$0.50$4.05
Coding index57.331.5
Independent measurements behind it56
Cost per solved taskNot computable$0.76
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Luna better than Inkling for coding?

Pick GPT-6 Luna for coding: it scores 57.3 on the Vibe Coding Index against 31.5 for Inkling, though on 5 benchmarks against 6. Pick Inkling for work measured by LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, GPT-6 Luna or Inkling?

GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens; Inkling costs $0.975 and $4.05. Cost per solved task is known for Inkling only.

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

GPT-6 Luna, with 1.05M tokens against 524K.

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

84 benchmarks have a result for both models as of October 22, 2026. GPT-6 Luna's coding index rests on 5 independent benchmarks and Inkling'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-thinkingmachines-inkling" title="GPT-6 Luna vs Inkling, 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-thinkingmachines-inkling">LLMBenchmark.ai, GPT-6 Luna vs Inkling</a></p>