DeepSeek V4 Flash vs GPT-5.6 Sol
DeepSeek V4 Flash 
GPT-5.6 Sol Verdict
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 59.1.
- DeepSeek V4 Flash (high) is stronger in human preference, instruction following.
- GPT-5.6 Sol (high) is stronger in agents & tools, coding, composite, knowledge, long context, reasoning, multimodal.
- DeepSeek V4 Flash (high) is 48× cheaper ($0.168 vs $8.00 per 1M blended).
- GPT-5.6 Sol (high) streams 1.3× faster (59 vs 44 tokens per second).
| Metric | DeepSeek V4 Flash (high) | GPT-5.6 Sol (high) |
|---|---|---|
| BenchLeader Index | 59.1 | 68.2 |
| Agents & tools score | 60.0 | 87.9 |
| Coding score | 57.3 | 72.4 |
| Composite score | 60.4 | 82.7 |
| Human preference score | 63.2 | – |
| Instruction following score | 71.5 | 67.8 |
| Knowledge score | 53.2 | 73.8 |
| Long context score | 62.4 | 67.4 |
| Reasoning score | 63.2 | 63.3 |
| Multimodal score | – | 66.4 |
| Blended price $/M | $0.168 | $8.00 |
| Output speed | 44 tok/s | 59 tok/s |
| Time to first answer | 11.7 s | 31.0 s |
| Context window | 1M | 1M |
| SciCode | 42.0% | 56.9% |
| WeirdML | 43.8% | 88.8% |
| LMArena Text | 1439 | – |
| LMArena Hard Prompts | 1458 | – |
| LMArena Coding | 1479 | – |
| LMArena WebDev | 1582 | – |
| LMArena Agent | 2.2 | – |
| AA Intelligence Index | 24.8 | 42.5 |
| IFBench | 73.5% | 69.2% |
| AA-LCR | 72.0% | 81.7% |
| MMMU-Pro | – | 81.8% |
| AA-Omniscience | -23.1 | 20.4 |
| Terminal-Bench Hard | 38.6% | 62.1% |
| GPQA Diamond (AA) | 86.7% | 92.8% |
| Humanity's Last Exam (AA) | 30.3% | 46.0% |
| SciCode (AA) | 40.2% | 57.8% |
| τ²-Bench Telecom (AA) | 95.6% | 83.3% |
| EnigmaEval | – | 37.1% |
| ARC-AGI-1 | – | 97.0% |
| ARC-AGI-2 | – | 85.4% |
| ARC-AGI-3 | – | 2.2% |
Data as of 2026-09-10. Best configuration of each model; every score links to its source on the model pages.
DeepSeek V4 Flash vs GPT-5.6 Sol: questions
- Is DeepSeek V4 Flash better than GPT-5.6 Sol?
- GPT-5.6 Sol (high) leads on quality: 68.2 vs 59.1. 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 DeepSeek V4 Flash better than GPT-5.6 Sol for coding?
- GPT-5.6 Sol scores higher in coding (72 vs 57 on the category index, where 50 is average).
- Is DeepSeek V4 Flash better than GPT-5.6 Sol for agentic tasks?
- GPT-5.6 Sol scores higher in agentic tasks (88 vs 60 on the category index, where 50 is average).
- Which is cheaper, DeepSeek V4 Flash or GPT-5.6 Sol?
- DeepSeek V4 Flash is cheaper: $0.168 against $8.00 per million tokens, blended at three input tokens per output token.
- Which is faster, DeepSeek V4 Flash or GPT-5.6 Sol?
- GPT-5.6 Sol streams faster: 59 against 44 output tokens per second.
- Which has the larger context window?
- Both accept 1M tokens of context.