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GPT-6 Luna vs Kimi K2.6

Updated October 21, 2026. 79 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.

Replace GPT-6 Luna Replace Kimi K2.6
GPT-6 LunaOpenAI
Coding
71.4
Overall
38.1
Output $/M
$0.50
34
Kimi K2.6Moonshot AI
Coding
44.2
Overall
27.0
Output $/M
$3.41
45
vs boards won of 79 shared

Decision reading

Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 44.2 for Kimi K2.6.

Pick Kimi K2.6 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Model AGPT-6 LunaOpenAI71.4/1002 independent benchmarksNo cost per solved taskModel BKimi K2.6Moonshot AI44.2/1001 independent benchmark$0.35 per solved task
Shared results
79
GPT-6 Luna only
23
Kimi K2.6 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
GPT-6 Luna 71.4 from 2 benchmarks, Kimi K2.6 44.2 from 1 benchmark.
Widest category
Math, 20.5 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-6 Luna 64.0% against Kimi K2.6 16.0%, 48.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Luna $0.50 against Kimi K2.6 $3.41 per million output tokens, 6.8x apart.
Context window
GPT-6 Luna takes 1.05M tokens, Kimi K2.6 262K.

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 LunaBarsKimi K2.6Ties
Coding102
Intelligence20
Agentic work52
Reasoning27
Math42
Knowledge24
Web design44
General524
All shared boards3445
CodingLike-for-likeFour of these boards feed the Vibe Coding Index102
Coding benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
LiveBench coding84.5%Not measuredOnly GPT-6 Luna measured
LMArena WebDev15781509GPT-6 Luna
AA Coding IndexNot measured61.8Only Kimi K2.6 measured
LiveCodeBench (Vals AI)Not measured86.8%Only Kimi K2.6 measured
SWE-bench Verified (Vals AI)Not measured76.2%Only Kimi K2.6 measured
Terminal-Bench 4 (Vals AI)13.6%Not measuredOnly GPT-6 Luna measured
Vibe Code Bench (Vals AI)81.7%37.9%GPT-6 Luna
Code migration (Vals AI)42.5%27.8%GPT-6 Luna
ProgramBench (Vals AI)0.5%0.0%GPT-6 Luna
IOI (Vals AI)55.6%Not measuredOnly GPT-6 Luna measured
Terminal-Bench 2.1 (Vals AI)73.0%53.6%GPT-6 Luna
SWE-bench Multimodal (Vals AI)37.5%Not measuredOnly GPT-6 Luna measured
CyberBench (Vals AI)76.3%Not measuredOnly GPT-6 Luna measured
SciCode54.6%51.5%GPT-6 Luna
Terminal-Bench Hard (Artificial Analysis run)Not measured43.9%Only Kimi K2.6 measured
FrontierCode42.4%Not measuredOnly GPT-6 Luna measured
WeirdMLNot measured55.9%Only Kimi K2.6 measured
ALE-Bench1576.91092.7GPT-6 Luna
LMArena Text: coding14371489Kimi K2.6
LMArena Text: software and IT14231484Kimi K2.6
LMArena WebDev: React15731505GPT-6 Luna
LMArena WebDev: HTML15951485GPT-6 Luna
LMArena WebDev: from an image15711521GPT-6 Luna
Neither model has a result on the other 15 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
AA Intelligence Index38.127.0GPT-6 Luna
Epoch Capabilities Index156.8150.9GPT-6 Luna
Agentic workLike-for-likePublic boards, shown as published, kept out of the index52
Agentic work benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
AA Agentic IndexNot measured20.5Only Kimi K2.6 measured
Design Arena: agents building web apps11891268Kimi K2.6
Design Arena: agents building full-stack apps11581155GPT-6 Luna
Design Arena: agents building mobile apps11331156Kimi K2.6
Design Arena: agents building Android appsNot measured1166Only Kimi K2.6 measured
Design Arena: agents building Godot gamesNot measured1120Only Kimi K2.6 measured
Design Arena: agents building gamesNot measured1141Only Kimi K2.6 measured
Design Arena: HTML slidesNot measured1184Only Kimi K2.6 measured
Design Arena: PowerPoint slidesNot measured1128Only Kimi K2.6 measured
Design Arena: spreadsheetsNot measured1276Only Kimi K2.6 measured
LiveBench research43.5%Not measuredOnly GPT-6 Luna measured
LiveBench browser72.0%Not measuredOnly GPT-6 Luna measured
LiveBench long agentic48.1%Not measuredOnly GPT-6 Luna measured
SREBench (Vals AI)2.7%Not measuredOnly GPT-6 Luna measured
Finance Agent (Vals AI)49.9%44.9%GPT-6 Luna
Tax Agent Bench (Vals AI)19.9%12.4%GPT-6 Luna
Legal Research Bench (Vals AI)30.3%15.9%GPT-6 Luna
Harvey's Legal Agent Benchmark (Vals AI)4.2%Not measuredOnly GPT-6 Luna measured
Excel Modeling Benchmark (Vals AI)68.5%57.9%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
τ²-Bench TelecomNot measured95.9%Only Kimi K2.6 measured
APEX-Agents44.3%Not measuredOnly GPT-6 Luna measured
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
SpireClimb0.0%Not measuredOnly GPT-6 Luna measured
Vending-Bench 2Not measured$6,205Only Kimi K2.6 measured
Neither model has a result on the other 12 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index27
Reasoning benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
GPQA DiamondNot measured89.1%Only Kimi K2.6 measured
LiveBench reasoning81.8%Not measuredOnly GPT-6 Luna measured
MysteryMechanism (Vals AI)19.4%Not measuredOnly GPT-6 Luna measured
MMMU Pro (Vals AI)Not measured86.3%Only Kimi K2.6 measured
GPQA Diamond (Artificial Analysis run)Not measured91.1%Only Kimi K2.6 measured
Humanity's Last Exam (Artificial Analysis run)38.5%37.5%GPT-6 Luna
GPQA Diamond (Epoch AI run)90.5%90.8%Kimi K2.6
ARC-AGI86.7%Not measuredOnly GPT-6 Luna measured
ARC-AGI-259.3%Not measuredOnly GPT-6 Luna measured
Chess puzzles36.0%20.0%GPT-6 Luna
Mystery game puzzles7.0%18.0%Kimi K2.6
EBR-benchNot measured2.4%Only Kimi K2.6 measured
LMArena Text: hard prompts14101470Kimi K2.6
LMArena Text: expert14421491Kimi K2.6
LMArena Text: hard prompts in English14101471Kimi K2.6
LMArena Vision: diagrams12451298Kimi K2.6
LMArena Vision: homework12611310Kimi K2.6
Neither model has a result on the other 4 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index42
Math benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
OTIS Mock AIME98.9%96.1%GPT-6 Luna
FrontierMath, tiers 1 to 378.9%57.2%GPT-6 Luna
FrontierMath, tier 456.1%25.6%GPT-6 Luna
ProofBench64.0%16.0%GPT-6 Luna
LMArena Text: math14091474Kimi K2.6
LMArena Text: mathematical work14271480Kimi K2.6
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 Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
MMLU ProNot measured87.6%Only Kimi K2.6 measured
LegalBench (Vals AI)Not measured84.7%Only Kimi K2.6 measured
CaseLaw (Vals AI)Not measured61.2%Only Kimi K2.6 measured
CorpFin (Vals AI)Not measured66.7%Only Kimi K2.6 measured
TaxEval (Vals AI)Not measured74.7%Only Kimi K2.6 measured
MortgageTax (Vals AI)Not measured65.8%Only Kimi K2.6 measured
MedCode (Vals AI)44.7%40.1%GPT-6 Luna
SimpleQA Verified41.4%34.9%GPT-6 Luna
LMArena Text: science13861468Kimi K2.6
LMArena Text: medicine and healthcare13521457Kimi K2.6
LMArena Text: legal and government14001462Kimi K2.6
LMArena Text: business and finance13881445Kimi K2.6
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index44
Web design benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
Design Arena: websites12721269GPT-6 Luna
Design Arena: UI components12971266GPT-6 Luna
Design Arena: game dev12591251GPT-6 Luna
Design Arena: data viz12151249Kimi K2.6
Design Arena: 3D12171268Kimi K2.6
Design Arena: all code categories12711272Kimi K2.6
Design Arena: SVG12531181GPT-6 Luna
Design Arena: ASCII art11561164Kimi K2.6
LiveBench design82.5%Not measuredOnly GPT-6 Luna measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index524
General benchmarks for GPT-6 Luna and Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
Vals Index52.3%Not measuredOnly GPT-6 Luna measured
LiveBench data analysis73.4%Not measuredOnly GPT-6 Luna measured
Public Benefits Bench (Vals AI)57.6%56.6%GPT-6 Luna
SAGE (Vals AI)48.1%50.2%Kimi K2.6
MedScribe (Vals AI)83.7%78.2%GPT-6 Luna
Vals Multimodal IndexNot measured56.4%Only Kimi K2.6 measured
IFBenchNot measured76.0%Only Kimi K2.6 measured
Long context reasoning (AA-LCR)83.3%81.0%GPT-6 Luna
DTBench90.1%90.9%Kimi K2.6
LMCA44.5%37.3%GPT-6 Luna
Furniture assembly44.2%21.7%GPT-6 Luna
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text13891455Kimi K2.6
LMArena Text: instruction following14081451Kimi K2.6
LMArena Text: creative writing13631434Kimi K2.6
LMArena Vision12161282Kimi K2.6
LMArena Text: English13931460Kimi K2.6
LMArena Text: non-English13811446Kimi K2.6
LMArena Text: Chinese14271520Kimi K2.6
LMArena Text: German13761451Kimi K2.6
LMArena Text: Japanese13691443Kimi K2.6
LMArena Text: Korean13591427Kimi K2.6
LMArena Text: French14081471Kimi K2.6
LMArena Text: Spanish13911464Kimi K2.6
LMArena Text: Russian13921446Kimi K2.6
LMArena Text: Polish13831438Kimi K2.6
LMArena Text: multi-turn13921453Kimi K2.6
LMArena Text: longer queries14081468Kimi K2.6
LMArena Text: writing and language13841439Kimi K2.6
LMArena Text: entertainment and media13641428Kimi K2.6
LMArena Vision: English12041287Kimi K2.6
LMArena Vision: Chinese12661346Kimi K2.6
LMArena Vision: reading text12251291Kimi K2.6
LMArena Vision: humorNot measured1280Only Kimi K2.6 measured
LMArena Vision: creative writing12051273Kimi K2.6
LMArena DocumentNot measured1451Only Kimi K2.6 measured
Neither model has a result on the other 10 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 Kimi K2.6
BenchmarkGPT-6 LunaKimi K2.6Leader
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
Kimi K2.6$0.0024Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

GPT-6 Luna$0.0065Fits in one request
Kimi K2.6$0.043Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

GPT-6 Luna$0.025Fits in one request
Kimi K2.6$0.164Fits 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 Kimi K2.6
SpecificationOpenAI GPT-6 LunaMoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 22, 2026April 20, 2026
Context window1.05M262K
Input $/Mtok$0.10$0.65
Output $/Mtok$0.50$3.41
Coding index71.444.2
Independent measurements behind it21
Cost per solved taskNot computable$0.35
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Luna better than Kimi K2.6 for coding?

Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 44.2 for Kimi K2.6. Pick Kimi K2.6 when what matters is LMArena Text: coding or LMArena Text: software and IT, where it leads.

Which is cheaper, GPT-6 Luna or Kimi K2.6?

GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens; Kimi K2.6 costs $0.65 and $3.41. Cost per solved task is known for Kimi K2.6 only.

Which has the bigger context window, GPT-6 Luna or Kimi K2.6?

GPT-6 Luna, with 1.05M tokens against 262K.

How many benchmarks is the GPT-6 Luna vs Kimi K2.6 comparison based on?

79 benchmarks have a result for both models as of October 21, 2026. GPT-6 Luna's coding index rests on 2 independent benchmarks and Kimi K2.6's on 1. Where only one model has a result, the page says so instead of naming a winner.

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