GPT-5.6 Luna vs GPT-6 Sol
GPT-5.6 Luna Verdict
- GPT-6 Sol (max) leads on quality: 67.7 vs 60.6.
- GPT-5.6 Luna (xhigh) is stronger in agents & tools, coding, human preference, maths.
- GPT-6 Sol (max) is stronger in composite, knowledge, long context, multimodal, reasoning.
- GPT-5.6 Luna (xhigh) is 8.9× cheaper ($0.450 vs $4.00 per 1M blended).
| Metric | GPT-5.6 Luna (xhigh) | GPT-6 Sol (max) |
|---|---|---|
| BenchLeader Index | 60.6 | 67.7 |
| Agents & tools score | 54.1 | – |
| Coding score | 59.6 | – |
| Composite score | 70.6 | 86.2 |
| Human preference score | 64.8 | – |
| Knowledge score | 57.9 | 75.4 |
| Long context score | 66.7 | 67.7 |
| Maths score | 67.0 | – |
| Multimodal score | 61.3 | 67.1 |
| Reasoning score | 59.3 | 95.0 |
| Blended price $/M | $0.450 | $4.00 |
| Output speed | 127 tok/s | 126 tok/s |
| Time to first answer | 40.2 s | 107.2 s |
| Context window | 1.1M | 1.1M |
| SimpleBench | 46.8% | – |
| SciCode | 50.0% | – |
| LMArena Text | 1453 | – |
| LMArena Hard Prompts | 1473 | – |
| LMArena Coding | 1498 | – |
| LMArena WebDev | 1519 | – |
| LMArena Vision | 1259 | – |
| LMArena Agent | -0.4 | – |
| AA Intelligence Index | 34.6 | 47.5 |
| AA-LCR | 81.7% | 83.7% |
| MMMU-Pro | 78.5% | 83.3% |
| AA-Omniscience | -10.8 | 27.1 |
| GPQA Diamond (AA) | 89.5% | – |
| Humanity's Last Exam (AA) | 37.0% | 47.9% |
| SciCode (AA) | 50.5% | 57.6% |
| ARC-AGI-1 | 87.7% | – |
| ARC-AGI-2 | 47.6% | – |
| ARC-AGI-3 | 0.0% | – |
| CritPt | 20.6% | 30.9% |
| GDPval (AA) | 44.2% | 49.4% |
| τ²-Bench Banking (AA) | 28.7% | – |
| LMArena Maths | 1477 | – |
| LMArena Creative Writing | 1411 | – |
| LMArena Instruction Following | 1442 | – |
| LMArena Multi-turn | 1458 | – |
| LMArena Longer Queries | 1450 | – |
| LMArena Document | 1462 | – |
| DeepSWE | 56.9% | – |
| LMCA | 48.5% | – |
| DTBench | 89.1% | – |
| CursorBench | 33.0% | – |
| Terminal-Bench 4.0 (AA) | 3.5% | 43.9% |
| Terminal-Bench 2.1 (AA) | 77.9% | – |
| AutomationBench | – | 61.6% |
| GDP.pdf | – | 24.8% |
| MLCR | – | 16.1% |
| AA-Omniscience: accuracy | 42.5% | 54.5% |
| AA-Omniscience: non-hallucination | 7.5% | 39.9% |
| AA-Briefcase | – | 1483 |
Data as of 2026-09-23. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Luna vs GPT-6 Sol: questions
- Is GPT-5.6 Luna better than GPT-6 Sol?
- GPT-6 Sol (max) leads on quality: 67.7 vs 60.6. The BenchLeader Index combines every independent quality benchmark; GPT-6 Sol (max) is ahead overall as of 2026-09-23, but check the category scores for your use.
- Which is cheaper, GPT-5.6 Luna or GPT-6 Sol?
- GPT-5.6 Luna is cheaper: $0.450 against $4.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Luna or GPT-6 Sol?
- GPT-5.6 Luna streams faster: 127 against 126 output tokens per second.
- Which has the larger context window?
- Both accept 1.1M tokens of context.