Nano Banana 2.1 is $0.5 cheaper per 1M input tokens (25% lower; 1.33x difference).
API cost decision in 10 seconds
NewKimi K3.1 Pro vs Nano Banana 2.1
Pick Nano Banana 2.1 for lower cost; pick Kimi K3.1 Pro 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 Nano Banana 2.1 for lower cost; pick Kimi K3.1 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Nano Banana 2.1 is estimated at $5.25 vs $7 for Kimi K3.1 Pro, saving $1.75 (25% lower).
Cost-first pickNano Banana 2.1
Context-first pickKimi K3.1 Pro
Sample savings$1.7525%
10x traffic gap$17.5
Kimi K3.1 Pro has more context, but Nano Banana 2.1 saves $1.75 on the standard workload. At 10x that traffic, the same price gap is about $17.5. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Nano Banana 2.1 stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Kimi K3.1 Pro | Nano Banana 2.1 |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Nano Banana 2.1 | $15 | $11.25 |
| Balanced workload | 1M input + 1M output | Nano Banana 2.1 | $12 | $9 |
| Output-heavy chatbot | 1M input + 5M output | Nano Banana 2.1 | $52 | $39 |
Nano Banana 2.1 is $2.5 cheaper per 1M output tokens (25% lower; 1.33x difference).
Kimi K3.1 Pro has 983.04K more context (16x larger).
Nano Banana 2.1 is $1.75 cheaper on the standard workload (25% 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
Nano Banana 2.1 has the lower input price; Nano Banana 2.1 has the lower output price; Kimi K3.1 Pro offers the larger context window. For the 1M input plus 500K output sample, Nano Banana 2.1 is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $7 for Kimi K3.1 Pro and $5.25 for Nano Banana 2.1.
Choose Kimi K3.1 Pro when you care most about larger context window.
Choose Nano Banana 2.1 when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Nano Banana 2.1 is estimated at $5.25 vs $7 for Kimi K3.1 Pro, saving $1.75 (25% lower).
- Nano Banana 2.1 is $1.75 cheaper on the standard workload (25% lower).
- Nano Banana 2.1 is $0.5 cheaper per 1M input tokens (25% lower; 1.33x difference).
- Nano Banana 2.1 is $2.5 cheaper per 1M output tokens (25% lower; 1.33x difference).
- Kimi K3.1 Pro has 983.04K more context (16x larger).
| Feature | NewKimi K3.1 Pro (MoonshotAI) | Nano Banana 2.1 (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $2 | $1.5 |
| Completion Price per 1M tokens | $10 | $7.5 |
| Sample Workload Cost 1M input + 500K output | $7 | $5.25 |
| Context Window | 1.05M | 65.54K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Nano Banana 2.1 | On the standard 1M input plus 500K output workload, Nano Banana 2.1 is estimated at $5.25 vs $7 for Kimi K3.1 Pro, saving $1.75 (25% lower). |
| High-volume input processing | Nano Banana 2.1 | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Nano Banana 2.1 | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Kimi K3.1 Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- Kimi K2.7 Code (free) can replace Kimi K3.1 Pro when lower sample workload cost matters most: $0.
- Kimi K2.6 (free) can replace Kimi K3.1 Pro when lower sample workload cost matters most: $0.
- Kimi K2 0711 can replace Kimi K3.1 Pro when lower sample workload cost matters most: $1.72.
- Kimi K2.5 can replace Kimi K3.1 Pro when lower sample workload cost matters most: $1.75.
- Grok 4.20 Multi-Agent offers 2M context with $2.5 sample workload cost.
- Grok 4.20 offers 2M context with $2.5 sample workload cost.
- Llama 4 Scout offers 1.31M context with $0.25 sample workload cost.
- MiMo-V2.6-Flash offers 1.05M context with $0.28 sample workload cost.
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- DeepSeek V4.1 Flash 1017 · DeepSeek · #2
- GLM 5.3 Flash · Z.ai · #3
- Hy4 preview · Tencent · #4
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