DeepSeek V4 Pro vs GPT-5.6 Luna
DeepSeek V4 Pro and GPT-5.6 Luna are both current production-tier models. DeepSeek V4 Pro is meaningfully cheaper at $0.43 / $0.87 per 1M. DeepSeek V4 Pro leads on coding, reasoning.
Specs side by side
| Metric | DeepSeek DeepSeek V4 Pro | OpenAI GPT-5.6 Luna |
|---|---|---|
| Input price (per 1M) | $0.435 | $1 |
| Output price (per 1M) | $0.87 | $6 |
| Context window | 1M tokens | 1.1M tokens |
| Speed tier | balanced | fast |
| Open weights | Yes | No |
| EU region | No | Yes |
| Free tier | No | No |
| Prompt caching | Yes | Yes |
| Vision input | No | Yes |
| Extended thinking | Yes | Yes |
When to choose each
Choose DeepSeek V4 Pro if…
- Cost is a priority ($0.43 / $0.87 per 1M vs $1 / $6 per 1M)
- You need open weights for self-hosting or fine-tuning
- Coding is central to your workload
- Reasoning is central to your workload
Choose GPT-5.6 Luna if…
- EU data residency is required
- HIPAA eligibility is required
- You need image input / vision
Benchmark delta
DeepSeek V4 Pro leads on
- Coding
- Reasoning
GPT-5.6 Luna leads on
GPT-5.6 Luna has no meaningful benchmark lead in this pair.
FAQ — DeepSeek V4 Pro vs GPT-5.6 Luna
DeepSeek V4 Pro vs GPT-5.6 Luna — which is better?
DeepSeek V4 Pro and GPT-5.6 Luna are both current production-tier models. DeepSeek V4 Pro is meaningfully cheaper at $0.43 / $0.87 per 1M. DeepSeek V4 Pro leads on coding, reasoning. The right pick depends on your use case — see "When to choose each" above for a data-driven decision.
How does DeepSeek V4 Pro pricing compare to GPT-5.6 Luna?
DeepSeek V4 Pro costs $0.43 / $0.87 per 1M vs GPT-5.6 Luna at $1 / $6 per 1M. DeepSeek V4 Pro is cheaper on output tokens by roughly 590%. Both support prompt caching, which reduces effective cost by 80-90% on repeat system prompts.
Does DeepSeek V4 Pro or GPT-5.6 Luna have the bigger context window?
GPT-5.6 Luna has a 1.1M-token context window — 1× the 1M context of DeepSeek V4 Pro. Enough for entire codebases, books, or multi-document RAG.
Is there a free tier for DeepSeek V4 Pro or GPT-5.6 Luna?
DeepSeek V4 Pro: no — No free tier on the official API — but at $0.435/$0.87 per 1M it is near-free vs frontier peers. GPT-5.6 Luna: no — Low-cost at $1/$6 per 1M; starter credits only.
Which is better for coding — DeepSeek V4 Pro or GPT-5.6 Luna?
DeepSeek V4 Pro leads on coding benchmarks (DeepSeek V4 Pro: 91/100, GPT-5.6 Luna: 85/100). For production coding agents also weigh tool-use performance — DeepSeek V4 Pro scores 86, GPT-5.6 Luna scores 87.