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GPT-6 Astra vs Kimi K2.6

GPT-6 Astra leads Kimi K2.6 on coding, 85.1 to 52.1 on the Vibe Coding Index, and Kimi K2.6 costs 12.5x less per output token ($4.00 vs $50.00 per million). Updated October 22, 2026; 87 benchmarks have a result for both.

Replace GPT-6 Astra Replace Kimi K2.6
GPT-6 AstraOpenAI
Coding
85.1
Overall
83.0
Output $/M
$50.00
60
Kimi K2.6Moonshot AI
Coding
52.1
Overall
60.5
Output $/M
$4.00
27
vs boards won of 87 shared

GPT-6 Astra or Kimi K2.6: which to pick

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 52.1 for Kimi K2.6.

Pick Kimi K2.6 for output tokens 12.5x cheaper ($4.00 vs $50.00 per million) and work measured by LMArena Text: software and IT or LMArena Text: hard prompts, where it leads.

Model AGPT-6 AstraOpenAI85.1/1005 independent benchmarksNo cost per solved taskModel BKimi K2.6Moonshot AI52.1/1003 independent benchmarks$0.35 per solved task
Shared results
87
GPT-6 Astra only
34
Kimi K2.6 only
22
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 Astra 85.1 from 5 benchmarks, Kimi K2.6 52.1 from 3 benchmarks.
Widest category
Math, 32.9 points apart on average over 6 shared benchmarks.
Widest single gap
ProofBench: GPT-6 Astra 99.0% against Kimi K2.6 16.0%, 83.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Astra $50.00 against Kimi K2.6 $4.00 per million output tokens, 12.5x apart.
Context window
GPT-6 Astra 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 AstraBarsKimi K2.6Ties
Coding131
Intelligence20
Agentic work120
Reasoning74
Math51
Knowledge33
Web design80
General1018
All shared boards6027
CodingLike-for-likeSix of these boards feed the Vibe Coding Index131
Coding benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
LiveBench coding93.7%Not measuredOnly GPT-6 Astra measured
LMArena WebDev17741509GPT-6 Astra
AA Coding Index76.961.8GPT-6 Astra
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)59.6%Not measuredOnly GPT-6 Astra measured
Vibe Code Bench (Vals AI)89.6%37.9%GPT-6 Astra
Code migration (Vals AI)67.7%27.8%GPT-6 Astra
ProgramBench (Vals AI)5.5%0.0%GPT-6 Astra
IOI (Vals AI)100.0%Not measuredOnly GPT-6 Astra measured
Terminal-Bench 2.1 (Vals AI)87.3%53.6%GPT-6 Astra
SWE-bench Multimodal (Vals AI)43.3%Not measuredOnly GPT-6 Astra measured
Vibe Code Bench 1-100 (Vals AI)27.6%Not measuredOnly GPT-6 Astra measured
CyberBench (Vals AI)41.1%Not measuredOnly GPT-6 Astra measured
SciCode56.5%51.5%GPT-6 Astra
Terminal-Bench Hard (Artificial Analysis run)Not measured43.9%Only Kimi K2.6 measured
FrontierCode53.3%Not measuredOnly GPT-6 Astra measured
FrontierSWE65.5%Not measuredOnly GPT-6 Astra measured
GSO-Bench79.4%Not measuredOnly GPT-6 Astra measured
WeirdML93.3%55.9%GPT-6 Astra
MirrorCode46.7%Not measuredOnly GPT-6 Astra measured
ALE-Bench2951.31092.7GPT-6 Astra
LMArena Text: coding14891489GPT-6 Astra
LMArena Text: software and IT14741484Kimi K2.6
LMArena WebDev: React17981505GPT-6 Astra
LMArena WebDev: HTML17751485GPT-6 Astra
LMArena WebDev: from an image17261521GPT-6 Astra
SciCode12.3%Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 11 boards here
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
Intelligence benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
AA Intelligence Index52.727.0GPT-6 Astra
Epoch Capabilities Index168.8150.9GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index120
Agentic work benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
AA Agentic Index51.020.5GPT-6 Astra
Design Arena: agents building web apps13731268GPT-6 Astra
Design Arena: agents building full-stack apps13571155GPT-6 Astra
Design Arena: agents building mobile apps13121156GPT-6 Astra
Design Arena: agents building Android appsNot measured1161Only Kimi K2.6 measured
Design Arena: agents building Godot games13481120GPT-6 Astra
Design Arena: agents building gamesNot measured1141Only Kimi K2.6 measured
Design Arena: HTML slidesNot measured1135Only Kimi K2.6 measured
Design Arena: PowerPoint slides12191103GPT-6 Astra
Design Arena: spreadsheets13651276GPT-6 Astra
LiveBench research85.2%Not measuredOnly GPT-6 Astra measured
LiveBench browser84.0%Not measuredOnly GPT-6 Astra measured
LiveBench long agentic82.4%Not measuredOnly GPT-6 Astra measured
SREBench (Vals AI)56.9%Not measuredOnly GPT-6 Astra measured
Finance Agent (Vals AI)53.5%44.9%GPT-6 Astra
Tax Agent Bench (Vals AI)20.7%12.4%GPT-6 Astra
Legal Research Bench (Vals AI)39.4%15.9%GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)7.1%Not measuredOnly GPT-6 Astra measured
Excel Modeling Benchmark (Vals AI)71.7%57.9%GPT-6 Astra
BioMysteryBench (Vals AI)79.3%Not measuredOnly GPT-6 Astra measured
Terminal-Bench-Science (Vals AI)62.9%Not measuredOnly GPT-6 Astra measured
Vals Science Index65.1%Not measuredOnly GPT-6 Astra measured
Time Horizon Index (Vals AI)90.5%Not measuredOnly GPT-6 Astra measured
CUA-bench (Vals AI)19.2%Not measuredOnly GPT-6 Astra measured
Robo-bench (Vals AI)23.3%Not measuredOnly GPT-6 Astra measured
τ²-Bench TelecomNot measured95.9%Only Kimi K2.6 measured
APEX-Agents64.7%Not measuredOnly GPT-6 Astra measured
Remote Labor Index20.8%Not measuredOnly GPT-6 Astra measured
OSWorld 2.0Not measured4.6%Only Kimi K2.6 measured
BALROG68.3%Not measuredOnly GPT-6 Astra measured
SpireClimb25.7%Not measuredOnly GPT-6 Astra measured
Vending-Bench 2$15,515$6,205GPT-6 Astra
Neither model has a result on the other 9 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index74
Reasoning benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
GPQA DiamondNot measured89.1%Only Kimi K2.6 measured
LiveBench reasoning92.7%Not measuredOnly GPT-6 Astra measured
MysteryMechanism (Vals AI)53.1%Not measuredOnly GPT-6 Astra measured
MMMU Pro (Vals AI)Not measured86.3%Only Kimi K2.6 measured
GPQA Diamond (Artificial Analysis run)96.3%91.1%GPT-6 Astra
Humanity's Last Exam (Artificial Analysis run)54.7%37.5%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.8%90.8%GPT-6 Astra
ARC-AGI98.5%Not measuredOnly GPT-6 Astra measured
ARC-AGI-295.0%Not measuredOnly GPT-6 Astra measured
Chess puzzles74.0%20.0%GPT-6 Astra
Mystery game puzzles84.0%18.0%GPT-6 Astra
EBR-bench76.2%2.4%GPT-6 Astra
LMArena Text: hard prompts14631470Kimi K2.6
LMArena Text: expert14891491Kimi K2.6
LMArena Text: hard prompts in English14641471Kimi K2.6
LMArena Vision: diagrams12971298Kimi K2.6
LMArena Vision: homework13371310GPT-6 Astra
Neither model has a result on the other 5 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index51
Math benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
OTIS Mock AIME100.0%96.1%GPT-6 Astra
FrontierMath, tiers 1 to 393.7%57.2%GPT-6 Astra
FrontierMath, tier 497.6%25.6%GPT-6 Astra
ProofBench99.0%16.0%GPT-6 Astra
LMArena Text: math14651474Kimi K2.6
LMArena Text: mathematical work14841480GPT-6 Astra
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index33
Knowledge benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi 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)48.5%40.1%GPT-6 Astra
SimpleQA Verified75.6%34.9%GPT-6 Astra
LMArena Text: science14511468Kimi K2.6
LMArena Text: medicine and healthcare14251457Kimi K2.6
LMArena Text: legal and government14621462GPT-6 Astra
LMArena Text: business and finance14391445Kimi K2.6
FACTS Benchmark Suite75.7%Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 5 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index80
Web design benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
Design Arena: websites13361268GPT-6 Astra
Design Arena: UI components13931263GPT-6 Astra
Design Arena: game dev14781250GPT-6 Astra
Design Arena: data viz13351249GPT-6 Astra
Design Arena: 3D15001267GPT-6 Astra
Design Arena: all code categories13791271GPT-6 Astra
Design Arena: SVG14311181GPT-6 Astra
Design Arena: ASCII art13531165GPT-6 Astra
LiveBench design82.0%Not measuredOnly GPT-6 Astra measured
GeneralLike-for-likePublic boards, shown as published, kept out of the index1018
General benchmarks for GPT-6 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi K2.6Leader
Vals Index65.0%Not measuredOnly GPT-6 Astra measured
LiveBench data analysis83.0%Not measuredOnly GPT-6 Astra measured
Public Benefits Bench (Vals AI)Not measured56.6%Only Kimi K2.6 measured
SAGE (Vals AI)46.4%50.2%Kimi K2.6
MedScribe (Vals AI)87.9%78.2%GPT-6 Astra
Vals Multimodal IndexNot measured56.4%Only Kimi K2.6 measured
IFBenchNot measured76.0%Only Kimi K2.6 measured
Long context reasoning (AA-LCR)80.7%81.0%Kimi K2.6
DTBench97.3%90.9%GPT-6 Astra
LMCA64.4%37.3%GPT-6 Astra
Furniture assembly80.0%21.7%GPT-6 Astra
ExploitBenchNot measured18.4%Only Kimi K2.6 measured
LMArena Text14411455Kimi K2.6
LMArena Text: instruction following14551451GPT-6 Astra
LMArena Text: creative writing14201434Kimi K2.6
LMArena Vision12801282Kimi K2.6
LMArena Text: English14471460Kimi K2.6
LMArena Text: non-English14321446Kimi K2.6
LMArena Text: Chinese14891520Kimi K2.6
LMArena Text: German14591451GPT-6 Astra
LMArena Text: Japanese14051443Kimi K2.6
LMArena Text: Korean14281427GPT-6 Astra
LMArena Text: French14321471Kimi K2.6
LMArena Text: Spanish14221464Kimi K2.6
LMArena Text: Russian14381446Kimi K2.6
LMArena Text: Polish14221438Kimi K2.6
LMArena Text: multi-turn14471453Kimi K2.6
LMArena Text: longer queries14601468Kimi K2.6
LMArena Text: writing and language14371439Kimi K2.6
LMArena Text: entertainment and media14271428Kimi K2.6
LMArena Vision: English12801287Kimi K2.6
LMArena Vision: Chinese13611346GPT-6 Astra
LMArena Vision: reading text12921291GPT-6 Astra
LMArena Vision: humorNot measured1280Only Kimi K2.6 measured
LMArena Vision: creative writing12861273GPT-6 Astra
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 Astra and Kimi K2.6
BenchmarkGPT-6 AstraKimi 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 Astra$0.035Fits in one request
Kimi K2.6$0.0029Fits in one request

Kimi K2.6 costs less

Repository review

50K input + 3K output tokens

GPT-6 Astra$0.650Fits in one request
Kimi K2.6$0.059Fits in one request

Kimi K2.6 costs less

Agent loop

200K input + 10K output tokens

GPT-6 Astra$2.50Fits in one request
Kimi K2.6$0.230Fits in one request

Kimi K2.6 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 GPT-6 Astra and Kimi K2.6
SpecificationOpenAI GPT-6 AstraMoonshotAI Kimi K2.6
MakerOpenAIMoonshot AI
WeightsNo public weights listedOpen weights
ReleasedSeptember 4, 2026April 20, 2026
Context window1.05M262K
Input $/Mtok$10.00$0.95
Output $/Mtok$50.00$4.00
Coding index85.152.1
Independent measurements behind it53
Cost per solved taskNot computable$0.35
SourceOpenRouter listingOpenRouter listing

Questions

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

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 52.1 for Kimi K2.6. Pick Kimi K2.6 for output tokens 12.5x cheaper ($4.00 vs $50.00 per million) and work measured by LMArena Text: software and IT or LMArena Text: hard prompts, where it leads.

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

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; Kimi K2.6 costs $0.95 and $4.00. Cost per solved task is known for Kimi K2.6 only.

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

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

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

87 benchmarks have a result for both models as of October 22, 2026. GPT-6 Astra's coding index rests on 5 independent benchmarks and Kimi K2.6's on 3. Where only one model has a result, the page says so instead of naming a winner.

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