DeepSeek V4 Flash vs GPT-5.6 Luna — Price, Context, and Capability Compared
Verdict
GPT-5.6 Luna costs 2.6× more per blended million tokens than DeepSeek V4 Flash. GPT-5.6 Luna has the larger context window (400,000 tokens). Default to DeepSeek V4 Flash unless you specifically need GPT-5.6 Luna's edge.
Spec comparison
| DeepSeek V4 Flash | GPT-5.6 Luna | |
|---|---|---|
| Price (input) | $0.14/M ✓ | $0.20/M |
| Price (output) | $0.28/M ✓ | $1.20/M |
| Blended price | $0.17/M ✓ | $0.45/M |
| Context window | 128,000 tokens | 400,000 tokens ✓ |
| Max output | 32,000 tokens | 64,000 tokens ✓ |
| Modalities | text | text, vision |
| Reasoning mode | No | No |
| Released | 2026-05 | 2026-06 |
| Speed | 132 t/s ✓ | 126 t/s |
Cost at scale (3:1 blended)
| Tokens / month | DeepSeek V4 Flash | GPT-5.6 Luna | Delta |
|---|---|---|---|
| 1,000,000 | $0.17 | $0.45 | $0.28 (2.6×) |
| 10,000,000 | $1.75 | $4.50 | $2.75 (2.6×) |
| 100,000,000 | $17.50 | $45.00 | $27.50 (2.6×) |
Choose DeepSeek V4 Flash if…
- ✓Latest DeepSeek flagship, non-thinking mode
- ✓Aggressively cheap per-token pricing
- ✓Strong algorithmic coding
- ✓High-volume coding and text workloads where budget is the top priority.
Choose GPT-5.6 Luna if…
- ✓Cheapest current GPT-5.6 tier
- ✓Low latency for high-volume calls
- ✓Vision input included
- ✓High-volume, latency-sensitive tasks like classification, extraction, and chat.
Run this exact matchup right now
Send the same prompt to DeepSeek V4 Flash and GPT-5.6 Luna side by side and see the outputs yourself.
Try DeepSeek V4 Flash vs GPT-5.6 Luna FreeFAQ
Is DeepSeek V4 Flash cheaper than GPT-5.6 Luna?
DeepSeek V4 Flash is cheaper, at $0.17 per million blended tokens vs $0.45 for GPT-5.6 Luna.
Which has the bigger context window, DeepSeek V4 Flash or GPT-5.6 Luna?
GPT-5.6 Luna has the larger context window: 400,000 tokens vs 128,000.
Can DeepSeek V4 Flash replace GPT-5.6 Luna for coding?
Both are viable for coding. Latest DeepSeek flagship, non-thinking mode (DeepSeek V4 Flash) vs Cheapest current GPT-5.6 tier (GPT-5.6 Luna) — pick based on which strength matters more for your workload.
Which is faster, DeepSeek V4 Flash or GPT-5.6 Luna?
DeepSeek V4 Flash is faster: 132 t/s vs 126 t/s, measured on our speed benchmarks.
Related
Pricing verified 2026-06-14. Specs verified 2026-08-08.
