DeepSeek Flash Latest is $0.05 cheaper per 1M input tokens (25% lower; 1.33x difference).
API cost decision in 10 seconds
🔥GPT-5.6 Luna vs NewDeepSeek Flash Latest
Pick DeepSeek Flash Latest for lower cost; pick GPT-5.6 Luna only if the larger context window matters more.
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Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick DeepSeek Flash Latest for lower cost; pick GPT-5.6 Luna only if the larger context window matters more.
On the standard 1M input plus 500K output workload, DeepSeek Flash Latest is estimated at $0.45 vs $0.8 for GPT-5.6 Luna, saving $0.35 (43.8% lower).
Cost-first pickDeepSeek Flash Latest
Context-first pickGPT-5.6 Luna
Sample savings$0.3543.8%
10x traffic gap$3.5
GPT-5.6 Luna has more context, but DeepSeek Flash Latest saves $0.35 on the standard workload. At 10x that traffic, the same price gap is about $3.5. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
DeepSeek Flash Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.6 Luna | DeepSeek Flash Latest |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | DeepSeek Flash Latest | $1.6 | $1.05 |
| Balanced workload | 1M input + 1M output | DeepSeek Flash Latest | $1.4 | $0.75 |
| Output-heavy chatbot | 1M input + 5M output | DeepSeek Flash Latest | $6.2 | $3.15 |
DeepSeek Flash Latest is $0.6 cheaper per 1M output tokens (50% lower; 2x difference).
GPT-5.6 Luna has 1.42K more context (1x larger).
DeepSeek Flash Latest is $0.35 cheaper on the standard workload (43.8% lower).
Estimate your workload cost
Your Workload Cost
This estimate uses normalized public API pricing per 1M tokens. It is a planning aid, not a billing quote. Verify provider pricing, limits, and terms before production use.
Quick Decision
DeepSeek Flash Latest has the lower input price; DeepSeek Flash Latest has the lower output price; GPT-5.6 Luna offers the larger context window. For the 1M input plus 500K output sample, DeepSeek Flash Latest is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.8 for GPT-5.6 Luna and $0.45 for DeepSeek Flash Latest.
Choose GPT-5.6 Luna when you care most about larger context window.
Choose DeepSeek Flash Latest when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, DeepSeek Flash Latest is estimated at $0.45 vs $0.8 for GPT-5.6 Luna, saving $0.35 (43.8% lower).
- DeepSeek Flash Latest is $0.35 cheaper on the standard workload (43.8% lower).
- DeepSeek Flash Latest is $0.05 cheaper per 1M input tokens (25% lower; 1.33x difference).
- DeepSeek Flash Latest is $0.6 cheaper per 1M output tokens (50% lower; 2x difference).
- GPT-5.6 Luna has 1.42K more context (1x larger).
| Feature | 🔥GPT-5.6 Luna (OpenAI) | NewDeepSeek Flash Latest (DeepSeek) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.2 | $0.15 |
| Completion Price per 1M tokens | $1.2 | $0.6 |
| Sample Workload Cost 1M input + 500K output | $0.8 | $0.45 |
| Context Window | 1.05M | 1.05M |
| Release Date | ||
| Popularity | #1 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | DeepSeek Flash Latest | On the standard 1M input plus 500K output workload, DeepSeek Flash Latest is estimated at $0.45 vs $0.8 for GPT-5.6 Luna, saving $0.35 (43.8% lower). |
| High-volume input processing | DeepSeek Flash Latest | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | DeepSeek Flash Latest | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.6 Luna | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.6 Luna when lower sample workload cost matters most: $0.12.
- GLM 5.3 Flash offers 1.31M context with $0.4 sample workload cost.
- DeepSeek V4 Flash 0731 offers 1.31M context with $0.12 sample workload cost.
- GLM Flash Latest offers 1.31M context with $0.2 sample workload cost.
- DeepSeek V4 Flash Latest offers 1.31M context with $0.09 sample workload cost.
- Hy4 preview · Tencent · #2
- GLM 5.3 Flash · Z.ai · #3
- DeepSeek V4 Flash 0731 · DeepSeek · #4
- MiMo-V2.5 · Xiaomi · #5
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Open DeepSeek modelsGPT-5.6 Luna is a fast, cost-efficient model in OpenAI's GPT-5.6 series. It is suited for high-volume, latency-sensitive tasks such as chat, classification, and lightweight agentic workflows, providing capable reasoning for...
This model always redirects to the latest model in the DeepSeek Flash family.