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GPT-6 Astra vs GPT-6 Luna

GPT-6 Astra leads GPT-6 Luna on coding, 85.1 to 57.3 on the Vibe Coding Index, and GPT-6 Luna costs 100.0x less per output token ($0.50 vs $50.00 per million). Updated October 22, 2026; 102 benchmarks have a result for both.

Replace GPT-6 Astra Replace GPT-6 Luna
GPT-6 AstraOpenAI
Coding
85.1
Overall
83.0
Output $/M
$50.00
98
GPT-6 LunaOpenAI
Coding
57.3
Overall
59.7
Output $/M
$0.50
4
vs boards won of 102 shared

GPT-6 Astra or GPT-6 Luna: which to pick

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 57.3 for GPT-6 Luna.

Pick GPT-6 Luna for output tokens 100.0x cheaper ($0.50 vs $50.00 per million) and work measured by CyberBench (Vals AI) or LiveBench design, where it leads.

Model AGPT-6 AstraOpenAI85.1/1005 independent benchmarksNo cost per solved taskModel BGPT-6 LunaOpenAI57.3/1005 independent benchmarksNo cost per solved task
Shared results
102
GPT-6 Astra only
19
GPT-6 Luna only
1
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, GPT-6 Luna 57.3 from 5 benchmarks.
Widest category
Agentic work, 23.0 points apart on average over 17 shared benchmarks.
Widest single gap
Mystery game puzzles: GPT-6 Astra 84.0% against GPT-6 Luna 7.0%, 77.0 points apart on a 0 to 100 scale.
Output price
GPT-6 Astra $50.00 against GPT-6 Luna $0.50 per million output tokens, 100.0x apart.
Context window
Both take 1.05M tokens.

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 AstraBarsGPT-6 LunaTies
Coding171
Intelligence20
Agentic work170
Reasoning130
Math60
Knowledge70
Web design81
General282
All shared boards984
CodingLike-for-likeSix of these boards feed the Vibe Coding Index171
Coding benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
LiveBench coding93.7%84.5%GPT-6 Astra
LMArena WebDev17741578GPT-6 Astra
AA Coding Index76.9Not measuredOnly GPT-6 Astra measured
Terminal-Bench 4 (Vals AI)59.6%13.6%GPT-6 Astra
Vibe Code Bench (Vals AI)89.6%81.7%GPT-6 Astra
Code migration (Vals AI)67.7%42.5%GPT-6 Astra
ProgramBench (Vals AI)5.5%0.5%GPT-6 Astra
IOI (Vals AI)100.0%55.6%GPT-6 Astra
Terminal-Bench 2.1 (Vals AI)87.3%73.0%GPT-6 Astra
SWE-bench Multimodal (Vals AI)43.3%37.5%GPT-6 Astra
Vibe Code Bench 1-100 (Vals AI)27.6%Not measuredOnly GPT-6 Astra measured
CyberBench (Vals AI)41.1%76.3%GPT-6 Luna
SciCode56.5%54.6%GPT-6 Astra
FrontierCode53.3%42.4%GPT-6 Astra
FrontierSWE65.5%Not measuredOnly GPT-6 Astra measured
GSO-Bench79.4%Not measuredOnly GPT-6 Astra measured
WeirdML93.3%Not measuredOnly GPT-6 Astra measured
MirrorCode46.7%Not measuredOnly GPT-6 Astra measured
ALE-Bench2951.31576.9GPT-6 Astra
LMArena Text: coding14891437GPT-6 Astra
LMArena Text: software and IT14741423GPT-6 Astra
LMArena WebDev: React17981573GPT-6 Astra
LMArena WebDev: HTML17751595GPT-6 Astra
LMArena WebDev: from an image17261571GPT-6 Astra
SciCode12.3%Not measuredOnly GPT-6 Astra 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 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
AA Intelligence Index52.738.1GPT-6 Astra
Epoch Capabilities Index168.8156.8GPT-6 Astra
Agentic workLike-for-likePublic boards, shown as published, kept out of the index170
Agentic work benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
AA Agentic Index51.0Not measuredOnly GPT-6 Astra measured
Design Arena: agents building web apps13731191GPT-6 Astra
Design Arena: agents building full-stack apps13571158GPT-6 Astra
Design Arena: agents building mobile apps13121134GPT-6 Astra
Design Arena: agents building Godot games1348Not measuredOnly GPT-6 Astra measured
Design Arena: PowerPoint slides1219Not measuredOnly GPT-6 Astra measured
Design Arena: spreadsheets1365Not measuredOnly GPT-6 Astra measured
LiveBench research85.2%43.5%GPT-6 Astra
LiveBench browser84.0%72.0%GPT-6 Astra
LiveBench long agentic82.4%48.1%GPT-6 Astra
SREBench (Vals AI)56.9%2.7%GPT-6 Astra
Finance Agent (Vals AI)53.5%49.9%GPT-6 Astra
Tax Agent Bench (Vals AI)20.7%19.9%GPT-6 Astra
Legal Research Bench (Vals AI)39.4%30.3%GPT-6 Astra
Harvey's Legal Agent Benchmark (Vals AI)7.1%4.2%GPT-6 Astra
Excel Modeling Benchmark (Vals AI)71.7%68.5%GPT-6 Astra
BioMysteryBench (Vals AI)79.3%61.5%GPT-6 Astra
Terminal-Bench-Science (Vals AI)62.9%4.3%GPT-6 Astra
Vals Science Index65.1%28.4%GPT-6 Astra
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
APEX-Agents64.7%44.3%GPT-6 Astra
Remote Labor Index20.8%Not measuredOnly GPT-6 Astra measured
BALROG68.3%Not measuredOnly GPT-6 Astra measured
SpireClimb25.7%0.0%GPT-6 Astra
Vending-Bench 2$15,515Not measuredOnly GPT-6 Astra measured
Neither model has a result on the other 14 boards here
ReasoningLike-for-likePublic boards, shown as published, kept out of the index130
Reasoning benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
LiveBench reasoning92.7%81.8%GPT-6 Astra
MysteryMechanism (Vals AI)53.1%19.4%GPT-6 Astra
GPQA Diamond (Artificial Analysis run)96.3%Not measuredOnly GPT-6 Astra measured
Humanity's Last Exam (Artificial Analysis run)54.7%38.5%GPT-6 Astra
GPQA Diamond (Epoch AI run)95.8%90.5%GPT-6 Astra
ARC-AGI98.5%86.7%GPT-6 Astra
ARC-AGI-295.0%59.3%GPT-6 Astra
Chess puzzles74.0%36.0%GPT-6 Astra
Mystery game puzzles84.0%7.0%GPT-6 Astra
EBR-bench76.2%Not measuredOnly GPT-6 Astra measured
LMArena Text: hard prompts14631410GPT-6 Astra
LMArena Text: expert14891442GPT-6 Astra
LMArena Text: hard prompts in English14641410GPT-6 Astra
LMArena Vision: diagrams12971245GPT-6 Astra
LMArena Vision: homework13371261GPT-6 Astra
Neither model has a result on the other 7 boards here
MathLike-for-likePublic boards, shown as published, kept out of the index60
Math benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
OTIS Mock AIME100.0%98.9%GPT-6 Astra
FrontierMath, tiers 1 to 393.7%78.9%GPT-6 Astra
FrontierMath, tier 497.6%56.1%GPT-6 Astra
ProofBench99.0%64.0%GPT-6 Astra
LMArena Text: math14651409GPT-6 Astra
LMArena Text: mathematical work14841427GPT-6 Astra
Neither model has a result on the other 7 boards here
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index70
Knowledge benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
MedCode (Vals AI)48.5%44.7%GPT-6 Astra
SimpleQA Verified75.6%41.4%GPT-6 Astra
LMArena Text: science14511386GPT-6 Astra
LMArena Text: medicine and healthcare14251352GPT-6 Astra
LMArena Text: legal and government14621400GPT-6 Astra
LMArena Text: business and finance14391388GPT-6 Astra
FACTS Benchmark Suite75.7%63.3%GPT-6 Astra
Neither model has a result on the other 11 boards here
Web designLike-for-likePublic boards, shown as published, kept out of the index81
Web design benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
Design Arena: websites13361271GPT-6 Astra
Design Arena: UI components13931295GPT-6 Astra
Design Arena: game dev14781257GPT-6 Astra
Design Arena: data viz13351216GPT-6 Astra
Design Arena: 3D15001218GPT-6 Astra
Design Arena: all code categories13791270GPT-6 Astra
Design Arena: SVG14311252GPT-6 Astra
Design Arena: ASCII art13531153GPT-6 Astra
LiveBench design82.0%82.5%GPT-6 Luna
GeneralLike-for-likePublic boards, shown as published, kept out of the index282
General benchmarks for GPT-6 Astra and GPT-6 Luna
BenchmarkGPT-6 AstraGPT-6 LunaLeader
Vals Index65.0%52.3%GPT-6 Astra
LiveBench data analysis83.0%73.4%GPT-6 Astra
Public Benefits Bench (Vals AI)Not measured57.6%Only GPT-6 Luna measured
SAGE (Vals AI)46.4%48.1%GPT-6 Luna
MedScribe (Vals AI)87.9%83.7%GPT-6 Astra
Long context reasoning (AA-LCR)80.7%83.3%GPT-6 Luna
DTBench97.3%90.1%GPT-6 Astra
LMCA64.4%44.5%GPT-6 Astra
Furniture assembly80.0%44.2%GPT-6 Astra
LMArena Text14411389GPT-6 Astra
LMArena Text: instruction following14551408GPT-6 Astra
LMArena Text: creative writing14201363GPT-6 Astra
LMArena Vision12801216GPT-6 Astra
LMArena Text: English14471393GPT-6 Astra
LMArena Text: non-English14321381GPT-6 Astra
LMArena Text: Chinese14891427GPT-6 Astra
LMArena Text: German14591376GPT-6 Astra
LMArena Text: Japanese14051369GPT-6 Astra
LMArena Text: Korean14281359GPT-6 Astra
LMArena Text: French14321408GPT-6 Astra
LMArena Text: Spanish14221391GPT-6 Astra
LMArena Text: Russian14381392GPT-6 Astra
LMArena Text: Polish14221383GPT-6 Astra
LMArena Text: multi-turn14471392GPT-6 Astra
LMArena Text: longer queries14601408GPT-6 Astra
LMArena Text: writing and language14371384GPT-6 Astra
LMArena Text: entertainment and media14271364GPT-6 Astra
LMArena Vision: English12801204GPT-6 Astra
LMArena Vision: Chinese13611266GPT-6 Astra
LMArena Vision: reading text12921225GPT-6 Astra
LMArena Vision: creative writing12861205GPT-6 Astra
Neither model has a result on the other 15 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 GPT-6 Luna
BenchmarkGPT-6 AstraGPT-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

GPT-6 Astra$0.035Fits in one request
GPT-6 Luna$0.0003Fits in one request

GPT-6 Luna costs less

Repository review

50K input + 3K output tokens

GPT-6 Astra$0.650Fits in one request
GPT-6 Luna$0.0065Fits in one request

GPT-6 Luna costs less

Agent loop

200K input + 10K output tokens

GPT-6 Astra$2.50Fits 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 GPT-6 Astra and GPT-6 Luna
SpecificationOpenAI GPT-6 AstraOpenAI GPT-6 Luna
MakerOpenAIOpenAI
WeightsNo public weights listedNo public weights listed
ReleasedSeptember 4, 2026September 22, 2026
Context window1.05M1.05M
Input $/Mtok$10.00$0.10
Output $/Mtok$50.00$0.50
Coding index85.157.3
Independent measurements behind it55
Cost per solved taskNot computableNot computable
SourceOpenRouter listingOpenRouter listing

Questions

Is GPT-6 Astra better than GPT-6 Luna for coding?

Pick GPT-6 Astra for coding: it scores 85.1 on the Vibe Coding Index against 57.3 for GPT-6 Luna. Pick GPT-6 Luna for output tokens 100.0x cheaper ($0.50 vs $50.00 per million) and work measured by CyberBench (Vals AI) or LiveBench design, where it leads.

Which is cheaper, GPT-6 Astra or GPT-6 Luna?

GPT-6 Astra costs $10.00 per million input tokens and $50.00 per million output tokens; GPT-6 Luna costs $0.10 and $0.50. Cost per solved task is known for neither of them.

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

Neither: both take 1.05M tokens.

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

102 benchmarks have a result for both models as of October 22, 2026. GPT-6 Astra's coding index rests on 5 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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<p style="font:13px/1.4 sans-serif;margin:6px 0 0">Source: <a href="https://llmbenchmark.ai/compare/gpt-6-astra-vs-gpt-6-luna">LLMBenchmark.ai, GPT-6 Astra vs GPT-6 Luna</a></p>