Qwen3.5-Flash is $1.94 cheaper per 1M input tokens (96.8% lower; 30.8x difference).
API cost decision in 10 seconds
Qwen3.5-Flash vs Gemini 3.1 Pro Preview
Pick Qwen3.5-Flash for lower cost; pick Gemini 3.1 Pro Preview 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 Gemini 3.1 Pro Preview 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 $8 for Gemini 3.1 Pro Preview, saving $7.8 (97.6% lower).
Cost-first pickQwen3.5-Flash
Context-first pickGemini 3.1 Pro Preview
Sample savings$7.897.6%
10x traffic gap$78.05
Gemini 3.1 Pro Preview has more context, but Qwen3.5-Flash saves $7.8 on the standard workload. At 10x that traffic, the same price gap is about $78.05. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Qwen3.5-Flash stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Qwen3.5-Flash | Gemini 3.1 Pro Preview |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Qwen3.5-Flash | $0.46 | $16 |
| Balanced workload | 1M input + 1M output | Qwen3.5-Flash | $0.33 | $14 |
| Output-heavy chatbot | 1M input + 5M output | Qwen3.5-Flash | $1.36 | $62 |
Qwen3.5-Flash is $11.74 cheaper per 1M output tokens (97.8% lower; 46.2x difference).
Gemini 3.1 Pro Preview has 48.58K more context (1.05x larger).
Qwen3.5-Flash is $7.8 cheaper on the standard workload (97.6% 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; Qwen3.5-Flash has the lower output price; Gemini 3.1 Pro Preview 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 Qwen3.5-Flash and $8 for Gemini 3.1 Pro Preview.
Choose Qwen3.5-Flash when you care most about lower input-token price, and lower output-token price.
Choose Gemini 3.1 Pro Preview when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Qwen3.5-Flash is estimated at $0.2 vs $8 for Gemini 3.1 Pro Preview, saving $7.8 (97.6% lower).
- Qwen3.5-Flash is $7.8 cheaper on the standard workload (97.6% lower).
- Qwen3.5-Flash is $1.94 cheaper per 1M input tokens (96.8% lower; 30.8x difference).
- Qwen3.5-Flash is $11.74 cheaper per 1M output tokens (97.8% lower; 46.2x difference).
- Gemini 3.1 Pro Preview has 48.58K more context (1.05x larger).
| Feature | Qwen3.5-Flash (Qwen) | Gemini 3.1 Pro Preview (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.065 | $2 |
| Completion Price per 1M tokens | $0.26 | $12 |
| Sample Workload Cost 1M input + 500K output | $0.2 | $8 |
| Context Window | 1M | 1.05M |
| Release Date |
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 $8 for Gemini 3.1 Pro Preview, saving $7.8 (97.6% 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 | Qwen3.5-Flash | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Gemini 3.1 Pro Preview | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- 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.
- Qwen3.5-9B can replace Qwen3.5-Flash when lower sample workload cost matters most: $0.11.
- 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.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
- DeepSeek V4 Flash · DeepSeek · #1
- Hy3 preview · Tencent · #2
- Claude Opus 4.7 · Anthropic · #3
- Claude Sonnet 4.6 · Anthropic · #4
Cheaper alternatives
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