GPT-6 Luna vs o4 Mini
Updated October 21, 2026. 59 benchmarks have a result for both. Coding is ranked on the Vibe Coding Index; every other board is shown as published.
vs boards won of 59 shared
Decision reading
Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 68.6 for o4 Mini.
Pick o4 Mini when the benchmark that matters is LMArena Text: medicine and healthcare, where it leads.
Model AGPT-6 LunaOpenAI71.4/1002 independent benchmarksNo cost per solved taskModel Bo4 MiniOpenAI68.6/1002 independent benchmarksNo cost per solved task
- Shared results
- 59
- GPT-6 Luna only
- 43
- o4 Mini only
- 35
- Like-for-like categories
- 7 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.
Coding
Vibe Coding Index, four public coding benchmarks
GPT-6 Luna
GPT-6 Luna scores 71.4 against 68.6.
2 benchmarks behind each score
Intelligence
AA Intelligence Index
GPT-6 Luna
GPT-6 Luna leads, 38.1 against 16.7.
Same board, both measured
Reasoning
GPQA Diamond
No call
Only o4 Mini has a GPQA Diamond result, 74.5%.
Directional only
Math
AIME
No call
Only o4 Mini has a AIME result, 83.7%.
Directional only
Knowledge
MMLU Pro
No call
Only o4 Mini has a MMLU Pro result, 80.6%.
Directional only
Web design
Design Arena: websites
GPT-6 Luna
GPT-6 Luna leads, 1272 against 985.
Same board, both measured
General
Vals Index
No call
Only GPT-6 Luna has a Vals Index result, 52.3%.
Directional only
Long documents
Listed context window
GPT-6 Luna
GPT-6 Luna takes 1.05M tokens against 200K.
Listed by OpenRouter
Everyday cost
1K input + 500 output tokens
GPT-6 Luna
GPT-6 Luna $0.0003, o4 Mini $0.0033 per turn.
List prices
At a glance
- Coding index
- GPT-6 Luna 71.4 from 2 benchmarks, o4 Mini 68.6 from 2 benchmarks.
- Widest category
- Web design, 36.2 points apart on average over 6 shared benchmarks.
- Widest single gap
- ARC-AGI-2: GPT-6 Luna 59.3% against o4 Mini 6.1%, 53.2 points apart on a 0 to 100 scale.
- Output price
- GPT-6 Luna $0.50 against o4 Mini $4.40 per million output tokens, 8.8x apart.
- Context window
- GPT-6 Luna takes 1.05M tokens, o4 Mini 200K.
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.
| Category | GPT-6 Luna | Bars | o4 Mini | Ties |
|---|---|---|---|---|
| Coding | 2 | 0 | ||
| Intelligence | 2 | 0 | ||
| Reasoning | 11 | 0 | ||
| Math | 5 | 0 | ||
| Knowledge | 5 | 1 | ||
| Web design | 6 | 0 | ||
| General | 27 | 0 | ||
| All shared boards | 58 | 1 |
CodingLike-for-likeFour of these boards feed the Vibe Coding Index20
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| Aider polyglot | Not measured | 72.0% | Only o4 Mini measured |
| SWE-bench Verified | Not measured | 64.6% | Only o4 Mini measured |
| SWE-bench Multimodal | Not measured | 33.9% | Only o4 Mini measured |
| LiveBench coding | 84.5% | Not measured | Only GPT-6 Luna measured |
| LMArena WebDev | 1578 | Not measured | Only GPT-6 Luna measured |
| LiveCodeBench (Vals AI) | Not measured | 82.2% | Only o4 Mini measured |
| Terminal-Bench 4 (Vals AI) | 13.6% | Not measured | Only GPT-6 Luna measured |
| Vibe Code Bench (Vals AI) | 81.7% | Not measured | Only GPT-6 Luna measured |
| Code migration (Vals AI) | 42.5% | Not measured | Only GPT-6 Luna measured |
| ProgramBench (Vals AI) | 0.5% | Not measured | Only GPT-6 Luna measured |
| IOI (Vals AI) | 55.6% | Not measured | Only GPT-6 Luna measured |
| Terminal-Bench 2.1 (Vals AI) | 73.0% | Not measured | Only GPT-6 Luna measured |
| SWE-bench Multimodal (Vals AI) | 37.5% | Not measured | Only GPT-6 Luna measured |
| CyberBench (Vals AI) | 76.3% | Not measured | Only GPT-6 Luna measured |
| LiveCodeBench (Artificial Analysis run) | Not measured | 85.9% | Only o4 Mini measured |
| SciCode | 54.6% | Not measured | Only GPT-6 Luna measured |
| Terminal-Bench Hard (Artificial Analysis run) | Not measured | 15.2% | Only o4 Mini measured |
| FrontierCode | 42.4% | Not measured | Only GPT-6 Luna measured |
| GSO-Bench | Not measured | 3.6% | Only o4 Mini measured |
| WeirdML | Not measured | 52.6% | Only o4 Mini measured |
| ALE-Bench | 1576.9 | Not measured | Only GPT-6 Luna measured |
| LMArena Text: coding | 1437 | 1368 | GPT-6 Luna |
| LMArena Text: software and IT | 1423 | 1367 | GPT-6 Luna |
| LMArena WebDev: React | 1573 | Not measured | Only GPT-6 Luna measured |
| LMArena WebDev: HTML | 1595 | Not measured | Only GPT-6 Luna measured |
| LMArena WebDev: from an image | 1571 | Not measured | Only GPT-6 Luna measured |
| Neither model has a result on the other 12 boards here | |||
IntelligenceLike-for-likePublic boards, shown as published, kept out of the index20
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| AA Intelligence Index | 38.1 | 16.7 | GPT-6 Luna |
| Epoch Capabilities Index | 156.8 | 145.5 | GPT-6 Luna |
Agentic workDirectional onlyPublic boards, shown as published, kept out of the index19 boards, none shared
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| Design Arena: agents building web apps | 1189 | Not measured | Only GPT-6 Luna measured |
| Design Arena: agents building full-stack apps | 1158 | Not measured | Only GPT-6 Luna measured |
| Design Arena: agents building mobile apps | 1133 | Not measured | Only GPT-6 Luna measured |
| LiveBench research | 43.5% | Not measured | Only GPT-6 Luna measured |
| LiveBench browser | 72.0% | Not measured | Only GPT-6 Luna measured |
| LiveBench long agentic | 48.1% | Not measured | Only GPT-6 Luna measured |
| SREBench (Vals AI) | 2.7% | Not measured | Only GPT-6 Luna measured |
| Finance Agent (Vals AI) | 49.9% | Not measured | Only GPT-6 Luna measured |
| Tax Agent Bench (Vals AI) | 19.9% | Not measured | Only GPT-6 Luna measured |
| Legal Research Bench (Vals AI) | 30.3% | Not measured | Only GPT-6 Luna measured |
| Harvey's Legal Agent Benchmark (Vals AI) | 4.2% | Not measured | Only GPT-6 Luna measured |
| Excel Modeling Benchmark (Vals AI) | 68.5% | Not measured | Only GPT-6 Luna measured |
| BioMysteryBench (Vals AI) | 61.5% | Not measured | Only GPT-6 Luna measured |
| Terminal-Bench-Science (Vals AI) | 4.3% | Not measured | Only GPT-6 Luna measured |
| Vals Science Index | 28.4% | Not measured | Only GPT-6 Luna measured |
| τ²-Bench Telecom | Not measured | 55.6% | Only o4 Mini measured |
| APEX-Agents | 44.3% | Not measured | Only GPT-6 Luna measured |
| METR time horizons | Not measured | 63.9% | Only o4 Mini measured |
| SpireClimb | 0.0% | Not measured | Only GPT-6 Luna measured |
| Neither model has a result on the other 20 boards here | |||
ReasoningLike-for-likePublic boards, shown as published, kept out of the index110
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| GPQA Diamond | Not measured | 74.5% | Only o4 Mini measured |
| LiveBench reasoning | 81.8% | Not measured | Only GPT-6 Luna measured |
| MysteryMechanism (Vals AI) | 19.4% | Not measured | Only GPT-6 Luna measured |
| MMMU Pro (Vals AI) | Not measured | 79.7% | Only o4 Mini measured |
| GPQA Diamond (Artificial Analysis run) | Not measured | 78.4% | Only o4 Mini measured |
| Humanity's Last Exam (Artificial Analysis run) | 38.5% | 16.5% | GPT-6 Luna |
| GPQA Diamond (Epoch AI run) | 90.5% | 79.6% | GPT-6 Luna |
| ARC-AGI | 86.7% | 58.7% | GPT-6 Luna |
| ARC-AGI-2 | 59.3% | 6.1% | GPT-6 Luna |
| SimpleBench | Not measured | 38.7% | Only o4 Mini measured |
| Chess puzzles | 36.0% | 22.0% | GPT-6 Luna |
| Mystery game puzzles | 7.0% | 5.0% | GPT-6 Luna |
| VPCT | Not measured | 57.5% | Only o4 Mini measured |
| LMArena Text: hard prompts | 1410 | 1351 | GPT-6 Luna |
| LMArena Text: expert | 1442 | 1343 | GPT-6 Luna |
| LMArena Text: hard prompts in English | 1410 | 1366 | GPT-6 Luna |
| LMArena Vision: diagrams | 1245 | 1197 | GPT-6 Luna |
| LMArena Vision: homework | 1261 | 1234 | GPT-6 Luna |
| Neither model has a result on the other 3 boards here | |||
MathLike-for-likePublic boards, shown as published, kept out of the index50
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| AIME | Not measured | 83.7% | Only o4 Mini measured |
| MATH 500 (Vals AI) | Not measured | 94.2% | Only o4 Mini measured |
| MGSM (Vals AI) | Not measured | 93.4% | Only o4 Mini measured |
| AA Math Index | Not measured | 90.7 | Only o4 Mini measured |
| AIME 2025 (Artificial Analysis run) | Not measured | 90.7% | Only o4 Mini measured |
| OTIS Mock AIME | 98.9% | 81.7% | GPT-6 Luna |
| FrontierMath, tiers 1 to 3 | 78.9% | 36.1% | GPT-6 Luna |
| FrontierMath, tier 4 | 56.1% | 4.9% | GPT-6 Luna |
| ProofBench | 64.0% | Not measured | Only GPT-6 Luna measured |
| MATH level 5 | Not measured | 97.8% | Only o4 Mini measured |
| LMArena Text: math | 1409 | 1389 | GPT-6 Luna |
| LMArena Text: mathematical work | 1427 | 1379 | GPT-6 Luna |
| Neither model has a result on the other 1 board here | |||
KnowledgeLike-for-likePublic boards, shown as published, kept out of the index51
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| MMLU Pro | Not measured | 80.6% | Only o4 Mini measured |
| LegalBench (Vals AI) | Not measured | 79.2% | Only o4 Mini measured |
| CorpFin (Vals AI) | Not measured | 59.0% | Only o4 Mini measured |
| TaxEval (Vals AI) | Not measured | 74.8% | Only o4 Mini measured |
| MortgageTax (Vals AI) | Not measured | 64.8% | Only o4 Mini measured |
| MedQA (Vals AI) | Not measured | 96.0% | Only o4 Mini measured |
| MedCode (Vals AI) | 44.7% | 33.8% | GPT-6 Luna |
| MMLU Pro (Artificial Analysis run) | Not measured | 83.2% | Only o4 Mini measured |
| SimpleQA Verified | 41.4% | 19.6% | GPT-6 Luna |
| GeoBench | Not measured | 64.0% | Only o4 Mini measured |
| LMArena Text: science | 1386 | 1354 | GPT-6 Luna |
| LMArena Text: medicine and healthcare | 1352 | 1361 | o4 Mini |
| LMArena Text: legal and government | 1400 | 1350 | GPT-6 Luna |
| LMArena Text: business and finance | 1388 | 1325 | GPT-6 Luna |
| Neither model has a result on the other 3 boards here | |||
Web designLike-for-likePublic boards, shown as published, kept out of the index60
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| Design Arena: websites | 1272 | 985 | GPT-6 Luna |
| Design Arena: UI components | 1297 | 983 | GPT-6 Luna |
| Design Arena: game dev | 1259 | 1004 | GPT-6 Luna |
| Design Arena: data viz | 1215 | 990 | GPT-6 Luna |
| Design Arena: 3D | 1217 | 854 | GPT-6 Luna |
| Design Arena: all code categories | 1271 | 977 | GPT-6 Luna |
| Design Arena: SVG | 1253 | Not measured | Only GPT-6 Luna measured |
| Design Arena: ASCII art | 1156 | Not measured | Only GPT-6 Luna measured |
| LiveBench design | 82.5% | Not measured | Only GPT-6 Luna measured |
GeneralLike-for-likePublic boards, shown as published, kept out of the index270
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| Vals Index | 52.3% | Not measured | Only GPT-6 Luna measured |
| LiveBench data analysis | 73.4% | Not measured | Only GPT-6 Luna measured |
| Public Benefits Bench (Vals AI) | 57.6% | Not measured | Only GPT-6 Luna measured |
| SAGE (Vals AI) | 48.1% | 41.1% | GPT-6 Luna |
| MedScribe (Vals AI) | 83.7% | 69.1% | GPT-6 Luna |
| IFBench | Not measured | 68.7% | Only o4 Mini measured |
| Long context reasoning (AA-LCR) | 83.3% | 61.0% | GPT-6 Luna |
| DTBench | 90.1% | 77.6% | GPT-6 Luna |
| LMCA | 44.5% | 26.5% | GPT-6 Luna |
| Fiction.LiveBench | Not measured | 77.8% | Only o4 Mini measured |
| Creative writing (Lech Mazur) | Not measured | 75.0% | Only o4 Mini measured |
| Furniture assembly | 44.2% | Not measured | Only GPT-6 Luna measured |
| LMArena Text | 1389 | 1353 | GPT-6 Luna |
| LMArena Text: instruction following | 1408 | 1320 | GPT-6 Luna |
| LMArena Text: creative writing | 1363 | 1294 | GPT-6 Luna |
| LMArena Vision | 1216 | 1194 | GPT-6 Luna |
| LMArena Text: English | 1393 | 1367 | GPT-6 Luna |
| LMArena Text: non-English | 1381 | 1337 | GPT-6 Luna |
| LMArena Text: Chinese | 1427 | 1354 | GPT-6 Luna |
| LMArena Text: German | 1376 | 1336 | GPT-6 Luna |
| LMArena Text: Japanese | 1369 | 1308 | GPT-6 Luna |
| LMArena Text: Korean | 1359 | 1312 | GPT-6 Luna |
| LMArena Text: French | 1408 | 1364 | GPT-6 Luna |
| LMArena Text: Spanish | 1391 | 1346 | GPT-6 Luna |
| LMArena Text: Russian | 1392 | 1334 | GPT-6 Luna |
| LMArena Text: Polish | 1383 | 1358 | GPT-6 Luna |
| LMArena Text: multi-turn | 1392 | 1350 | GPT-6 Luna |
| LMArena Text: longer queries | 1408 | 1315 | GPT-6 Luna |
| LMArena Text: writing and language | 1384 | 1316 | GPT-6 Luna |
| LMArena Text: entertainment and media | 1364 | 1308 | GPT-6 Luna |
| LMArena Vision: English | 1204 | 1200 | GPT-6 Luna |
| LMArena Vision: Chinese | 1266 | 1218 | GPT-6 Luna |
| LMArena Vision: reading text | 1225 | 1197 | GPT-6 Luna |
| LMArena Vision: humor | Not measured | 1199 | Only o4 Mini measured |
| LMArena Vision: captioning | Not measured | 1204 | Only o4 Mini measured |
| LMArena Vision: recognizing things | Not measured | 1218 | Only o4 Mini measured |
| LMArena Vision: creative writing | 1205 | 1166 | GPT-6 Luna |
| Neither model has a result on the other 9 boards here | |||
Image generationNot comparablePublic boards, shown as published, kept out of the index0 boards, none shared
| Benchmark | GPT-6 Luna | o4 Mini | Leader |
|---|---|---|---|
| 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
o4 Mini$0.0033Fits in one request
GPT-6 Luna costs less
Repository review
50K input + 3K output tokens
GPT-6 Luna$0.0065Fits in one request
o4 Mini$0.068Fits in one request
GPT-6 Luna costs less
Agent loop
200K input + 10K output tokens
GPT-6 Luna$0.025Fits in one request
o4 Mini$0.264Exceeds the context window
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.
| Specification | OpenAI GPT-6 Luna | OpenAI o4 Mini |
|---|---|---|
| Maker | OpenAI | OpenAI |
| Weights | No public weights listed | No public weights listed |
| Released | September 22, 2026 | April 16, 2025 |
| Context window | 1.05M | 200K |
| Input $/Mtok | $0.10 | $1.10 |
| Output $/Mtok | $0.50 | $4.40 |
| Coding index | 71.4 | 68.6 |
| Independent measurements behind it | 2 | 2 |
| Cost per solved task | Not computable | Not computable |
| Source | OpenRouter listing | OpenRouter listing |
Questions
Is GPT-6 Luna better than o4 Mini for coding?
Pick GPT-6 Luna for coding: it scores 71.4 on the Vibe Coding Index against 68.6 for o4 Mini. Pick o4 Mini when the benchmark that matters is LMArena Text: medicine and healthcare, where it leads.
Which is cheaper, GPT-6 Luna or o4 Mini?
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens; o4 Mini costs $1.10 and $4.40. Cost per solved task is known for neither of them.
Which has the bigger context window, GPT-6 Luna or o4 Mini?
GPT-6 Luna, with 1.05M tokens against 200K.
How many benchmarks is the GPT-6 Luna vs o4 Mini comparison based on?
59 benchmarks have a result for both models as of October 21, 2026. GPT-6 Luna's coding index rests on 2 independent benchmarks and o4 Mini's on 2. Where only one model has a result, the page says so instead of naming a winner.