DeepSeek V4 Pro vs GPT-5.6 Sol — Price, Context, and Capability Compared
Verdict
GPT-5.6 Sol costs 20.7× more per blended million tokens than DeepSeek V4 Pro. GPT-5.6 Sol has the larger context window (400,000 tokens). Default to DeepSeek V4 Pro unless you specifically need GPT-5.6 Sol's edge.
Spec comparison
| DeepSeek V4 Pro | GPT-5.6 Sol | |
|---|---|---|
| Price (input) | $0.43/M ✓ | $5.00/M |
| Price (output) | $0.87/M ✓ | $30.00/M |
| Blended price | $0.54/M ✓ | $11.25/M |
| Context window | 128,000 tokens | 400,000 tokens ✓ |
| Max output | 64,000 tokens | 128,000 tokens ✓ |
| Modalities | text | text, vision |
| Reasoning mode | Yes | Yes |
| Released | 2026-05 | 2026-06 |
| Speed | 68 t/s ✓ | 44 t/s |
Cost at scale (3:1 blended)
| Tokens / month | DeepSeek V4 Pro | GPT-5.6 Sol | Delta |
|---|---|---|---|
| 1,000,000 | $0.54 | $11.25 | $10.71 (20.7×) |
| 10,000,000 | $5.44 | $112.50 | $107.06 (20.7×) |
| 100,000,000 | $54.37 | $1125.00 | $1070.63 (20.7×) |
Choose DeepSeek V4 Pro if…
- ✓Thinking mode with visible chain-of-thought
- ✓Frontier-level math and competition coding
- ✓Still far cheaper than closed frontier models
- ✓Rigorous math, proofs, and hard algorithmic problems on a budget.
Choose GPT-5.6 Sol if…
- ✓Strongest OpenAI model for agentic, long-horizon coding
- ✓Deep reasoning mode for multi-step planning
- ✓Native vision input
- ✓Complex, multi-step professional and coding work where accuracy matters more than cost.
Run this exact matchup right now
Send the same prompt to DeepSeek V4 Pro and GPT-5.6 Sol side by side and see the outputs yourself.
Try DeepSeek V4 Pro vs GPT-5.6 Sol FreeFAQ
Is DeepSeek V4 Pro cheaper than GPT-5.6 Sol?
DeepSeek V4 Pro is cheaper, at $0.54 per million blended tokens vs $11.25 for GPT-5.6 Sol.
Which has the bigger context window, DeepSeek V4 Pro or GPT-5.6 Sol?
GPT-5.6 Sol has the larger context window: 400,000 tokens vs 128,000.
Can DeepSeek V4 Pro replace GPT-5.6 Sol for coding?
Both are viable for coding. Thinking mode with visible chain-of-thought (DeepSeek V4 Pro) vs Strongest OpenAI model for agentic, long-horizon coding (GPT-5.6 Sol) — pick based on which strength matters more for your workload.
Which is faster, DeepSeek V4 Pro or GPT-5.6 Sol?
DeepSeek V4 Pro is faster: 68 t/s vs 44 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-06-14. Specs verified 2026-08-08.
