Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $29.5 cheaper per 1M input tokens (98.3% lower; 60x difference).
API cost decision in 10 seconds
GPT-5.5 Pro vs Nano Banana 2 (Gemini 3.1 Flash Image Preview)
Pick Nano Banana 2 (Gemini 3.1 Flash Image Preview) for lower cost; pick GPT-5.5 Pro 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 Nano Banana 2 (Gemini 3.1 Flash Image Preview) for lower cost; pick GPT-5.5 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Nano Banana 2 (Gemini 3.1 Flash Image Preview) is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower).
Cost-first pickNano Banana 2 (Gemini 3.1 Flash Image Preview)
Context-first pickGPT-5.5 Pro
Sample savings$11898.3%
10x traffic gap$1180
GPT-5.5 Pro has more context, but Nano Banana 2 (Gemini 3.1 Flash Image Preview) saves $118 on the standard workload. At 10x that traffic, the same price gap is about $1180. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Nano Banana 2 (Gemini 3.1 Flash Image Preview) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.5 Pro | Nano Banana 2 (Gemini 3.1 Flash Image Preview) |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | $240 | $4 |
| Balanced workload | 1M input + 1M output | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | $210 | $3.5 |
| Output-heavy chatbot | 1M input + 5M output | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | $930 | $15.5 |
Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $177 cheaper per 1M output tokens (98.3% lower; 60x difference).
GPT-5.5 Pro has 918.93K more context (8.01x larger).
Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $118 cheaper on the standard workload (98.3% 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 (Gemini 3.1 Flash Image Preview) has the lower input price; Nano Banana 2 (Gemini 3.1 Flash Image Preview) has the lower output price; GPT-5.5 Pro offers the larger context window. For the 1M input plus 500K output sample, Nano Banana 2 (Gemini 3.1 Flash Image Preview) is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $120 for GPT-5.5 Pro and $2 for Nano Banana 2 (Gemini 3.1 Flash Image Preview).
Choose GPT-5.5 Pro when you care most about larger context window.
Choose Nano Banana 2 (Gemini 3.1 Flash Image Preview) 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 (Gemini 3.1 Flash Image Preview) is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower).
- Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $118 cheaper on the standard workload (98.3% lower).
- Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $29.5 cheaper per 1M input tokens (98.3% lower; 60x difference).
- Nano Banana 2 (Gemini 3.1 Flash Image Preview) is $177 cheaper per 1M output tokens (98.3% lower; 60x difference).
- GPT-5.5 Pro has 918.93K more context (8.01x larger).
| Feature | GPT-5.5 Pro (OpenAI) | Nano Banana 2 (Gemini 3.1 Flash Image Preview) (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $30 | $0.5 |
| Completion Price per 1M tokens | $180 | $3 |
| Sample Workload Cost 1M input + 500K output | $120 | $2 |
| Context Window | 1.05M | 131.07K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | On the standard 1M input plus 500K output workload, Nano Banana 2 (Gemini 3.1 Flash Image Preview) is estimated at $2 vs $120 for GPT-5.5 Pro, saving $118 (98.3% lower). |
| High-volume input processing | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Nano Banana 2 (Gemini 3.1 Flash Image Preview) | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.5 Pro | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.5 Pro when lower sample workload cost matters most: $0.13.
- 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.
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