Nano Banana 2 (Gemini 3.1 Flash Image) is $4.5 cheaper per 1M input tokens (90% lower; 10x difference).
API cost decision in 10 seconds
Nano Banana 2 (Gemini 3.1 Flash Image) vs GPT Chat Latest
Pick Nano Banana 2 (Gemini 3.1 Flash Image) for lower cost; pick GPT Chat Latest 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 (Gemini 3.1 Flash Image) for lower cost; pick GPT Chat Latest 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) is estimated at $2 vs $20 for GPT Chat Latest, saving $18 (90% lower).
Cost-first pickNano Banana 2 (Gemini 3.1 Flash Image)
Context-first pickGPT Chat Latest
Sample savings$1890%
10x traffic gap$180
GPT Chat Latest has more context, but Nano Banana 2 (Gemini 3.1 Flash Image) saves $18 on the standard workload. At 10x that traffic, the same price gap is about $180. 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) stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | Nano Banana 2 (Gemini 3.1 Flash Image) | GPT Chat Latest |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Nano Banana 2 (Gemini 3.1 Flash Image) | $4 | $40 |
| Balanced workload | 1M input + 1M output | Nano Banana 2 (Gemini 3.1 Flash Image) | $3.5 | $35 |
| Output-heavy chatbot | 1M input + 5M output | Nano Banana 2 (Gemini 3.1 Flash Image) | $15.5 | $155 |
Nano Banana 2 (Gemini 3.1 Flash Image) is $27 cheaper per 1M output tokens (90% lower; 10x difference).
GPT Chat Latest has 268.93K more context (3.05x larger).
Nano Banana 2 (Gemini 3.1 Flash Image) is $18 cheaper on the standard workload (90% 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) has the lower input price; Nano Banana 2 (Gemini 3.1 Flash Image) has the lower output price; GPT Chat Latest offers the larger context window. For the 1M input plus 500K output sample, Nano Banana 2 (Gemini 3.1 Flash Image) is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $2 for Nano Banana 2 (Gemini 3.1 Flash Image) and $20 for GPT Chat Latest.
Choose Nano Banana 2 (Gemini 3.1 Flash Image) when you care most about lower input-token price, and lower output-token price.
Choose GPT Chat Latest when you care most about larger context window.
- On the standard 1M input plus 500K output workload, Nano Banana 2 (Gemini 3.1 Flash Image) is estimated at $2 vs $20 for GPT Chat Latest, saving $18 (90% lower).
- Nano Banana 2 (Gemini 3.1 Flash Image) is $18 cheaper on the standard workload (90% lower).
- Nano Banana 2 (Gemini 3.1 Flash Image) is $4.5 cheaper per 1M input tokens (90% lower; 10x difference).
- Nano Banana 2 (Gemini 3.1 Flash Image) is $27 cheaper per 1M output tokens (90% lower; 10x difference).
- GPT Chat Latest has 268.93K more context (3.05x larger).
| Feature | Nano Banana 2 (Gemini 3.1 Flash Image) (Google) | GPT Chat Latest (OpenAI) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.5 | $5 |
| Completion Price per 1M tokens | $3 | $30 |
| Sample Workload Cost 1M input + 500K output | $2 | $20 |
| Context Window | 131.07K | 400K |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Nano Banana 2 (Gemini 3.1 Flash Image) | On the standard 1M input plus 500K output workload, Nano Banana 2 (Gemini 3.1 Flash Image) is estimated at $2 vs $20 for GPT Chat Latest, saving $18 (90% lower). |
| High-volume input processing | Nano Banana 2 (Gemini 3.1 Flash Image) | 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) | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT Chat Latest | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
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