DeepSeek V4 Flash vs GPT-6 Sol
DeepSeek V4 Flash 
GPT-6 Sol Verdict
- GPT-6 Sol (max) leads on quality: 67.7 vs 61.3.
- DeepSeek V4 Flash (max) is stronger in agents & tools, coding, instruction following, maths.
- GPT-6 Sol (max) is stronger in composite, knowledge, long context, reasoning, multimodal.
- DeepSeek V4 Flash (max) is 15× cheaper ($0.262 vs $4.00 per 1M blended).
- DeepSeek V4 Flash (max) streams 1.8× faster (222 vs 126 tokens per second).
| Metric | DeepSeek V4 Flash (max) | GPT-6 Sol (max) |
|---|---|---|
| BenchLeader Index | 61.3 | 67.7 |
| Agents & tools score | 67.0 | – |
| Coding score | 48.6 | – |
| Composite score | 70.4 | 86.2 |
| Instruction following score | 76.7 | – |
| Knowledge score | 56.3 | 75.4 |
| Long context score | 65.6 | 67.7 |
| Maths score | 57.3 | – |
| Reasoning score | 71.0 | 95.0 |
| Multimodal score | – | 67.1 |
| Blended price $/M | $0.262 | $4.00 |
| Output speed | 222 tok/s | 126 tok/s |
| Time to first answer | 10.2 s | 107.2 s |
| Context window | 1M | 1.1M |
| SciCode | 44.9% | – |
| WeirdML | 45.6% | – |
| AA Intelligence Index | 34.3 | 47.5 |
| IFBench | 79.2% | – |
| AA-LCR | 79.7% | 83.7% |
| MMMU-Pro | – | 83.3% |
| AA-Omniscience | -14.3 | 27.1 |
| Terminal-Bench Hard | 35.6% | – |
| GPQA Diamond (AA) | 90.8% | – |
| Humanity's Last Exam (AA) | 38.5% | 47.9% |
| SciCode (AA) | 50.4% | 57.6% |
| τ²-Bench Telecom (AA) | 95.0% | – |
| AIME 2026 | 95.8% | – |
| HMMT February 2026 | 93.9% | – |
| MathArena Apex | 27.1% | – |
| CritPt | 16.6% | 30.9% |
| GDPval (AA) | 46.3% | 49.4% |
| τ²-Bench Banking (AA) | 39.4% | – |
| ITBench SRE (AA) | 31.5% | – |
| Analyst Agent (AA) | 25.0% | – |
| LMCA | 35.9% | – |
| DTBench | 86.4% | – |
| Terminal-Bench 4.0 (AA) | 12.1% | 43.9% |
| Terminal-Bench 2.1 (AA) | 78.7% | – |
| AutomationBench | – | 61.6% |
| GDP.pdf | – | 24.8% |
| MLCR | – | 16.1% |
| AA-Omniscience: accuracy | 40.4% | 54.5% |
| AA-Omniscience: non-hallucination | 8.3% | 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.
DeepSeek V4 Flash vs GPT-6 Sol: questions
- Is DeepSeek V4 Flash better than GPT-6 Sol?
- GPT-6 Sol (max) leads on quality: 67.7 vs 61.3. 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, DeepSeek V4 Flash or GPT-6 Sol?
- DeepSeek V4 Flash is cheaper: $0.262 against $4.00 per million tokens, blended at three input tokens per output token.
- Which is faster, DeepSeek V4 Flash or GPT-6 Sol?
- DeepSeek V4 Flash streams faster: 222 against 126 output tokens per second.
- Which has the larger context window?
- GPT-6 Sol accepts more context: 1.1M against 1M tokens.