OpenAI GPT Mini Latest is $1.25 cheaper per 1M input tokens (62.5% lower; 2.67x difference).
API cost decision in 10 seconds
NewOpenAI GPT Mini Latest vs Gemini 3.1 Pro Preview Custom Tools
Pick OpenAI GPT Mini Latest for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.
Page updated:
Data confirmed:
Prices normalized to USD per 1M tokens
Sample workload: 1M input + 500K output
Budget verdict
Pick OpenAI GPT Mini Latest for lower cost; pick Gemini 3.1 Pro Preview Custom Tools only if the larger context window matters more.
On the standard 1M input plus 500K output workload, OpenAI GPT Mini Latest is estimated at $3 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $5 (62.5% lower).
Cost-first pickOpenAI GPT Mini Latest
Context-first pickGemini 3.1 Pro Preview Custom Tools
Sample savings$562.5%
10x traffic gap$50
Gemini 3.1 Pro Preview Custom Tools has more context, but OpenAI GPT Mini Latest saves $5 on the standard workload. At 10x that traffic, the same price gap is about $50. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
OpenAI GPT Mini Latest stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | OpenAI GPT Mini Latest | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | OpenAI GPT Mini Latest | $6 | $16 |
| Balanced workload | 1M input + 1M output | OpenAI GPT Mini Latest | $5.25 | $14 |
| Output-heavy chatbot | 1M input + 5M output | OpenAI GPT Mini Latest | $23.25 | $62 |
OpenAI GPT Mini Latest is $7.5 cheaper per 1M output tokens (62.5% lower; 2.67x difference).
Gemini 3.1 Pro Preview Custom Tools has 648.76K more context (2.62x larger).
OpenAI GPT Mini Latest is $5 cheaper on the standard workload (62.5% 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
OpenAI GPT Mini Latest has the lower input price; OpenAI GPT Mini Latest has the lower output price; Gemini 3.1 Pro Preview Custom Tools offers the larger context window. For the 1M input plus 500K output sample, OpenAI GPT Mini Latest is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $3 for OpenAI GPT Mini Latest and $8 for Gemini 3.1 Pro Preview Custom Tools.
Choose OpenAI GPT Mini Latest when you care most about lower input-token price, and lower output-token price.
Choose Gemini 3.1 Pro Preview Custom Tools when you care most about larger context window.
- On the standard 1M input plus 500K output workload, OpenAI GPT Mini Latest is estimated at $3 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $5 (62.5% lower).
- OpenAI GPT Mini Latest is $5 cheaper on the standard workload (62.5% lower).
- OpenAI GPT Mini Latest is $1.25 cheaper per 1M input tokens (62.5% lower; 2.67x difference).
- OpenAI GPT Mini Latest is $7.5 cheaper per 1M output tokens (62.5% lower; 2.67x difference).
- Gemini 3.1 Pro Preview Custom Tools has 648.76K more context (2.62x larger).
| Feature | NewOpenAI GPT Mini Latest (OpenAI) | Gemini 3.1 Pro Preview Custom Tools (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $0.75 | $2 |
| Completion Price per 1M tokens | $4.5 | $12 |
| Sample Workload Cost 1M input + 500K output | $3 | $8 |
| Context Window | 400K | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | OpenAI GPT Mini Latest | On the standard 1M input plus 500K output workload, OpenAI GPT Mini Latest is estimated at $3 vs $8 for Gemini 3.1 Pro Preview Custom Tools, saving $5 (62.5% lower). |
| High-volume input processing | OpenAI GPT Mini Latest | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | OpenAI GPT Mini Latest | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | Gemini 3.1 Pro Preview Custom Tools | A larger context window leaves more room for retrieved passages, conversation history, or source files. |
Related Alternatives
- gpt-oss-120b (free) can replace OpenAI GPT Mini Latest when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace OpenAI GPT Mini Latest when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace OpenAI GPT Mini Latest when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace OpenAI GPT Mini Latest 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.
- GPT-5.4 offers 1.05M context with $10 sample workload cost.
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