Model comparison
DeepSeek-V3 vs GPT-5.6 Luna
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 39.5 on the Noometry Index.
Last verified . 28 shared benchmarks.
DeepSeekSummary
- They share 28 benchmarks with published results for both. DeepSeek-V3 scores higher in 0 categories and GPT-5.6 Luna in 8 categories; 8 gaps are clear of the uncertainty.
- The widest gap is in math, where GPT-5.6 Luna leads 77.7 to 32.1.
- The biggest single-benchmark swing is OTIS Mock AIME 2024-2025: 37.8% for DeepSeek-V3 and 98.3% for GPT-5.6 Luna.
- DeepSeek-V3 is cheaper at $0.24 / $0.90 per million input/output tokens, against $0.20 / $1.20 for GPT-5.6 Luna.
- GPT-5.6 Luna accepts more context: 1.05M tokens versus 164K.
- DeepSeek-V3 has downloadable open weights; the other is API-only.
Side by side
| DeepSeek-V3 | GPT-5.6 Luna | |
|---|---|---|
| Provider | DeepSeek | OpenAI |
| Noometry Index | 39.5 | 54.6 |
| Released | 2024-12-26 | 2026-07-09 |
| Weights | Open | Proprietary |
| Context window | 164K | 1.05M |
| Max output | 164K | 128K |
| Input $ / M tokens | $0.24 | $0.20 |
| Output $ / M tokens | $0.90 | $1.20 |
| Results tracked | 60 | 52 |
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Category by category
Coding GPT-5.6 Luna leads
DeepSeek-V3: 42.3 (#106), GPT-5.6 Luna: 54.5 (#28)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| SciCode | 35.8% | 53.6% |
| WeirdML | 36.1% | 60.9% |
| LMArena Coding | 1368 | 1466 |
| DeepSWE | — | 67.2% |
| FrontierCode | — | 39.8% |
| Aider Polyglot | 55.1% | — |
| CursorBench | — | 35.9% |
| LMArena WebDev | — | 1519 |
| BigCodeBench Instruct | 50% | — |
| LiveBench Coding | 70.9% | — |
| BigCodeBench Complete | 62.2% | — |
| ALE-Bench | — | 1,667 |
| HumanEval+ | 86.6% | — |
| MBPP+ | 73% | — |
Agentic & Tool Use Not comparable
DeepSeek-V3: —, GPT-5.6 Luna: 34.4 (#45)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| APEX-Agents | — | 43% |
| BALROG | — | 45.6% |
| GDP.pdf | — | 22.7% |
| METR Time Horizons | 49.6% | — |
| Vending-Bench 2 | — | 4,095 |
Reasoning GPT-5.6 Luna leads
DeepSeek-V3: 20.5 (#236), GPT-5.6 Luna: 47.6 (#43)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| SimpleBench | 27.2% | 46.8% |
| Kagi LLM Benchmark | 52.3% | 49.1% |
| CritPt | 0% | 20.6% |
| LMArena Hard Prompts | 1365 | 1451 |
| DTBench | 64.8% | 89.1% |
| LMCA | 15.5% | 48.5% |
| Epoch Capabilities Index | 135.94 | 156.39 |
| ARC-AGI-2 | — | 59.5% |
| NYT Connections (extended) | — | 69.4% |
| ARC-AGI-1 | — | 88% |
| Chess Puzzles | — | 40% |
| LiveBench Reasoning | 65.8% | — |
| Mystery Game Puzzles | — | 21% |
| LiveBench Data Analysis | 60.9% | — |
| Surface Evolver Bench | — | 61.9% |
| BIG-Bench Hard | 87.5% | — |
| ForecastBench | 59.1 | — |
| HellaSwag | 88.9% | — |
| LiveBench | 66.9% | — |
| PIQA | 84.7% | — |
| WinoGrande | 85.2% | — |
Math GPT-5.6 Luna leads
DeepSeek-V3: 32.1 (#219), GPT-5.6 Luna: 77.7 (#14)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| OTIS Mock AIME 2024-2025 | 37.8% | 98.3% |
| LMArena Math | 1373 | 1458 |
| FrontierMath (Tiers 1-3) | — | 82.1% |
| FrontierMath Tier 4 | — | 61% |
| ProofBench | — | 60% |
| Omni-MATH | 40.3% | — |
| LiveBench Math | 73.5% | — |
| MATH Level 5 | 75.5% | — |
| FrontierMath (Feb 2025 set) | 1.7% | — |
Knowledge GPT-5.6 Luna leads
DeepSeek-V3: 37.5 (#155), GPT-5.6 Luna: 58.5 (#34)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| GPQA Diamond | 67.6% | 91.6% |
| LMArena Expert | 1351 | 1478 |
| SimpleQA Verified | — | 41% |
| MMLU-Pro | 72.3% | — |
| Confabulations | 26.1% | — |
| Vectara Hallucination Rate | 6.1% | — |
| GPQA (HELM) | 53.8% | — |
| ARC (AI2) Challenge | 95.3% | — |
| MMLU | 87.2% | — |
| TriviaQA | 82.9% | — |
Multimodal Not comparable
DeepSeek-V3: —, GPT-5.6 Luna: 42.7 (#28)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| LMArena Vision | — | 1258 |
| Blueprint-Bench 2 | — | 22.6% |
| Furniture Assembly | — | 42.5% |
| LMArena Document | — | 1457 |
Multilingual GPT-5.6 Luna leads
DeepSeek-V3: 48.5 (#143), GPT-5.6 Luna: 52.8 (#78)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| LMArena Non-English | 1358 | 1417 |
| LMArena Chinese | 1391 | 1470 |
| LMArena French | 1385 | 1456 |
| LMArena German | 1374 | 1454 |
| LMArena Japanese | 1333 | 1411 |
| LMArena Korean | 1319 | 1415 |
| LMArena Russian | 1373 | 1428 |
| LMArena Spanish | 1358 | 1448 |
Instruction Following GPT-5.6 Luna leads
DeepSeek-V3: 72.8 (#130), GPT-5.6 Luna: 75.6 (#57)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| LMArena Instruction Following | 1345 | 1437 |
| LiveBench Instruction Following | 81.5% | — |
| IFEval | 83.2% | — |
Long Context GPT-5.6 Luna leads
DeepSeek-V3: 34.0 (#253), GPT-5.6 Luna: 43.9 (#82)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| LMArena Longer Query | 1352 | 1436 |
| Fiction.LiveBench | 50% | — |
Writing & Preference GPT-5.6 Luna leads
DeepSeek-V3: 57.4 (#130), GPT-5.6 Luna: 68.0 (#29)
| Benchmark | DeepSeek-V3 | GPT-5.6 Luna |
|---|---|---|
| LMArena Text | 1375 | 1431 |
| LMArena Creative Writing | 1364 | 1396 |
| EQ-Bench Creative Writing | 1472 | 1829 |
| LMArena Multi-Turn | 1389 | 1434 |
| Short-Story Creative Writing | 77% | — |
| WildBench | 83% | — |
| EQ-Bench 4 | — | 1156 |
| LiveBench Language | 49.1% | — |
Frequently asked questions
Is DeepSeek-V3 better than GPT-5.6 Luna?
GPT-5.6 Luna is the stronger model overall, scoring 54.6 to 39.5 on the Noometry Index.
Which is cheaper, DeepSeek-V3 or GPT-5.6 Luna?
DeepSeek-V3 is cheaper. It lists at $0.24 per million input tokens and $0.90 per million output tokens; GPT-5.6 Luna lists at $0.20 and $1.20.
Is DeepSeek-V3 or GPT-5.6 Luna better for coding?
GPT-5.6 Luna scores higher on coding benchmarks: 54.5 versus 42.3 in the Noometry coding category.
Which has the bigger context window?
GPT-5.6 Luna does, with 1.05M tokens against 164K.
How many benchmarks do DeepSeek-V3 and GPT-5.6 Luna share?
28 benchmarks have published results for both models. DeepSeek-V3 has 60 scored results on Noometry and GPT-5.6 Luna has 52.