GPT-5.6 Luna vs GPT-5.6 Sol
GPT-5.6 Luna Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 59.4.
- GPT-5.6 Luna (xhigh) is stronger in human preference.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, knowledge, multimodal, reasoning, instruction following.
- GPT-5.6 Luna (xhigh) is 18× cheaper ($0.450 vs $8.00 per 1M blended).
- GPT-5.6 Luna (xhigh) streams 1.8× faster (107 vs 59 tokens per second).
| Metric | GPT-5.6 Luna (xhigh) | GPT-5.6 Sol (high) |
|---|---|---|
| BenchLeader Index | 59.4 | 68.2 |
| Agents & tools score | 50.1 | 87.9 |
| Coding score | 60.0 | 72.4 |
| Composite score | 72.9 | 82.7 |
| Human preference score | 65.0 | – |
| Knowledge score | 59.0 | 73.8 |
| Long context score | 67.4 | 67.4 |
| Multimodal score | 61.6 | 66.4 |
| Reasoning score | 53.9 | 63.3 |
| Instruction following score | – | 67.8 |
| Blended price $/M | $0.450 | $8.00 |
| Output speed | 107 tok/s | 59 tok/s |
| Time to first answer | 55.4 s | 31.0 s |
| Context window | 1M | 1M |
| SimpleBench | 46.8% | – |
| SciCode | 50.0% | 56.9% |
| WeirdML | – | 88.8% |
| LMArena Text | 1453 | – |
| LMArena Hard Prompts | 1473 | – |
| LMArena Coding | 1497 | – |
| LMArena WebDev | 1520 | – |
| LMArena Vision | 1254 | – |
| LMArena Agent | 1.1 | – |
| AA Intelligence Index | 34.8 | 42.5 |
| IFBench | – | 69.2% |
| AA-LCR | 81.7% | 81.7% |
| MMMU-Pro | 78.5% | 81.8% |
| AA-Omniscience | -10.8 | 20.4 |
| Terminal-Bench Hard | – | 62.1% |
| GPQA Diamond (AA) | 89.5% | 92.8% |
| Humanity's Last Exam (AA) | 37.0% | 46.0% |
| SciCode (AA) | 50.5% | 57.8% |
| τ²-Bench Telecom (AA) | – | 83.3% |
| EnigmaEval | – | 37.1% |
| ARC-AGI-1 | 87.7% | 97.0% |
| ARC-AGI-2 | 47.6% | 85.4% |
| ARC-AGI-3 | 0.0% | 2.2% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
GPT-5.6 Luna vs GPT-5.6 Sol: questions
- Is GPT-5.6 Luna better than GPT-5.6 Sol?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 59.4. The BenchLeader Index combines every independent quality benchmark; GPT-5.6 Sol (high) is ahead overall as of 2026-09-10, but check the category scores for your use.
- Is GPT-5.6 Luna better than GPT-5.6 Sol for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 60 on the category index, where 50 is average).
- Is GPT-5.6 Luna better than GPT-5.6 Sol for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 50 on the category index, where 50 is average).
- Which is cheaper, GPT-5.6 Luna or GPT-5.6 Sol?
- GPT-5.6 Luna is cheaper: $0.450 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, GPT-5.6 Luna or GPT-5.6 Sol?
- GPT-5.6 Luna streams faster: 107 against 59 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.