DeepSeek V4 Flash is $2.4 cheaper per 1M input tokens (96% lower; 25x difference).
API cost decision in 10 seconds
DeepSeek V4 Flash vs GPT-5.4
Pick DeepSeek V4 Flash for lower cost; pick GPT-5.4 only if the larger context window matters more.
Pricing data updated:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick DeepSeek V4 Flash for lower cost; pick GPT-5.4 only if the larger context window matters more.
On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $10 for GPT-5.4, saving $9.8 (98% lower).
Cost-first pickDeepSeek V4 Flash
Context-first pickGPT-5.4
Sample savings$9.898%
10x traffic gap$98
GPT-5.4 has more context, but DeepSeek V4 Flash saves $9.8 on the standard workload. At 10x that traffic, the same price gap is about $98. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
DeepSeek V4 Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | DeepSeek V4 Flash | GPT-5.4 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | DeepSeek V4 Flash | $0.6 | $20 |
| Balanced workload | 1M input + 1M output | DeepSeek V4 Flash | $0.3 | $17.5 |
| Output-heavy chatbot | 1M input + 5M output | DeepSeek V4 Flash | $1.1 | $77.5 |
DeepSeek V4 Flash is $14.8 cheaper per 1M output tokens (98.7% lower; 75x difference).
GPT-5.4 has 1.42K more context (1x larger).
DeepSeek V4 Flash is $9.8 cheaper on the standard workload (98% 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 V4 Flash has the lower input price; DeepSeek V4 Flash has the lower output price; GPT-5.4 offers the larger context window. For the 1M input plus 500K output sample, DeepSeek V4 Flash is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $0.2 for DeepSeek V4 Flash and $10 for GPT-5.4.
Choose DeepSeek V4 Flash when you care most about lower input-token price, and lower output-token price.
Choose GPT-5.4 when you care most about larger context window.
- On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $10 for GPT-5.4, saving $9.8 (98% lower).
- DeepSeek V4 Flash is $9.8 cheaper on the standard workload (98% lower).
- DeepSeek V4 Flash is $2.4 cheaper per 1M input tokens (96% lower; 25x difference).
- DeepSeek V4 Flash is $14.8 cheaper per 1M output tokens (98.7% lower; 75x difference).
- GPT-5.4 has 1.42K more context (1x larger).
| Feature | DeepSeek V4 Flash (DeepSeek) | GPT-5.4 (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.1 | $2.5 |
| Completion Price per 1M tokens | $0.2 | $15 |
| Sample Workload Cost 1M input + 500K output | $0.2 | $10 |
| Context Window | 1.05M | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | DeepSeek V4 Flash | On the standard 1M input plus 500K output workload, DeepSeek V4 Flash is estimated at $0.2 vs $10 for GPT-5.4, saving $9.8 (98% lower). |
| High-volume input processing | DeepSeek V4 Flash | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | DeepSeek V4 Flash | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.4 | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- DeepSeek V4 Flash (free) can replace DeepSeek V4 Flash when lower sample workload cost matters most: $0.
- gpt-oss-120b (free) can replace GPT-5.4 when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.4 when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.4 when lower sample workload cost matters most: $0.1.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Grok 4.20 Multi-Agent offers 2M context with $5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- No popular competitor is currently available.
Cheaper alternatives
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