Qwen3.5-Flash is $0.04 cheaper per 1M input tokens (35% lower; 1.54x difference).
API cost decision in 10 seconds
🔥DeepSeek V4 Flash vs Qwen3.5-Flash
Pick Qwen3.5-Flash for lower cost; pick DeepSeek V4 Flash 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 Qwen3.5-Flash for lower cost; pick DeepSeek V4 Flash only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Qwen3.5-Flash is estimated at $0.2 vs $0.2 for DeepSeek V4 Flash, saving $0.005 (2.5% lower).
Cost-first pickQwen3.5-Flash
Context-first pickDeepSeek V4 Flash
Sample savings$0.0052.5%
10x traffic gap$0.05
DeepSeek V4 Flash has more context, but Qwen3.5-Flash saves $0.005 on the standard workload. At 10x that traffic, the same price gap is about $0.05. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Cost winner changes by workload shape: input-heavy / RAG favors Qwen3.5-Flash, balanced workload favors DeepSeek V4 Flash, and output-heavy chatbot favors DeepSeek V4 Flash.
| Workload shape | Token mix | Better pick | DeepSeek V4 Flash | Qwen3.5-Flash |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Qwen3.5-Flash | $0.6 | $0.46 |
| Balanced workload | 1M input + 1M output | DeepSeek V4 Flash | $0.3 | $0.33 |
| Output-heavy chatbot | 1M input + 5M output | DeepSeek V4 Flash | $1.1 | $1.36 |
DeepSeek V4 Flash is $0.06 cheaper per 1M output tokens (23.1% lower; 1.3x difference).
DeepSeek V4 Flash has 48.58K more context (1.05x larger).
Qwen3.5-Flash is $0.005 cheaper on the standard workload (2.5% 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
Qwen3.5-Flash has the lower input price; DeepSeek V4 Flash has the lower output price; DeepSeek V4 Flash offers the larger context window. For the 1M input plus 500K output sample, Qwen3.5-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 $0.2 for Qwen3.5-Flash.
Choose DeepSeek V4 Flash when you care most about lower output-token price, and larger context window.
Choose Qwen3.5-Flash when you care most about lower input-token price.
- On the standard 1M input plus 500K output workload, Qwen3.5-Flash is estimated at $0.2 vs $0.2 for DeepSeek V4 Flash, saving $0.005 (2.5% lower).
- Qwen3.5-Flash is $0.005 cheaper on the standard workload (2.5% lower).
- Qwen3.5-Flash is $0.04 cheaper per 1M input tokens (35% lower; 1.54x difference).
- DeepSeek V4 Flash is $0.06 cheaper per 1M output tokens (23.1% lower; 1.3x difference).
- DeepSeek V4 Flash has 48.58K more context (1.05x larger).
| Feature | 🔥DeepSeek V4 Flash (DeepSeek) | Qwen3.5-Flash (Qwen) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.1 | $0.065 |
| Completion Price per 1M tokens | $0.2 | $0.26 |
| Sample Workload Cost 1M input + 500K output | $0.2 | $0.2 |
| Context Window | 1.05M | 1M |
| Release Date | ||
| Popularity | #1 |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Qwen3.5-Flash | On the standard 1M input plus 500K output workload, Qwen3.5-Flash is estimated at $0.2 vs $0.2 for DeepSeek V4 Flash, saving $0.005 (2.5% lower). |
| High-volume input processing | Qwen3.5-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 | DeepSeek V4 Flash | 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.
- Qwen3 Next 80B A3B Instruct (free) can replace Qwen3.5-Flash when lower sample workload cost matters most: $0.
- Qwen3 Coder 480B A35B (free) can replace Qwen3.5-Flash when lower sample workload cost matters most: $0.
- Qwen2.5 7B Instruct can replace Qwen3.5-Flash when lower sample workload cost matters most: $0.09.
- Llama 4 Scout offers 10M context with $0.23 sample workload cost.
- Owl Alpha offers 1.05M context with $0 sample workload cost.
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
- Claude Sonnet 4.6 · Anthropic · #4
- Owl Alpha · OpenRouter · #5
Cheaper alternatives
Review low-cost models sorted by a standard 1M input plus 500K output workload.
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