Gemini 3.1 Pro Preview Custom Tools is $28 cheaper per 1M input tokens (93.3% lower; 15x difference).
API cost decision in 10 seconds
GPT-5.4 Pro vs Gemini 3.1 Pro Preview Custom Tools
Pick Gemini 3.1 Pro Preview Custom Tools for lower cost; pick GPT-5.4 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 Gemini 3.1 Pro Preview Custom Tools for lower cost; pick GPT-5.4 Pro only if the larger context window matters more.
On the standard 1M input plus 500K output workload, Gemini 3.1 Pro Preview Custom Tools is estimated at $8 vs $120 for GPT-5.4 Pro, saving $112 (93.3% lower).
Cost-first pickGemini 3.1 Pro Preview Custom Tools
Context-first pickGPT-5.4 Pro
Sample savings$11293.3%
10x traffic gap$1120
GPT-5.4 Pro has more context, but Gemini 3.1 Pro Preview Custom Tools saves $112 on the standard workload. At 10x that traffic, the same price gap is about $1120. Use the calculator below to replace the sample workload with your own token volume.
Cost sensitivity
Workload Sensitivity
Gemini 3.1 Pro Preview Custom Tools stays cheaper across input-heavy, balanced, and output-heavy sample workloads.
| Workload shape | Token mix | Better pick | GPT-5.4 Pro | Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|---|---|
| Input-heavy / RAG | 5M input + 500K output | Gemini 3.1 Pro Preview Custom Tools | $240 | $16 |
| Balanced workload | 1M input + 1M output | Gemini 3.1 Pro Preview Custom Tools | $210 | $14 |
| Output-heavy chatbot | 1M input + 5M output | Gemini 3.1 Pro Preview Custom Tools | $930 | $62 |
Gemini 3.1 Pro Preview Custom Tools is $168 cheaper per 1M output tokens (93.3% lower; 15x difference).
GPT-5.4 Pro has 1.24K more context (1x larger).
Gemini 3.1 Pro Preview Custom Tools is $112 cheaper on the standard workload (93.3% 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
Gemini 3.1 Pro Preview Custom Tools has the lower input price; Gemini 3.1 Pro Preview Custom Tools has the lower output price; GPT-5.4 Pro offers the larger context window. For the 1M input plus 500K output sample, Gemini 3.1 Pro Preview Custom Tools is cheaper for the standard workload.
For a 1M input token plus 500K output token workload, the estimated API cost is $120 for GPT-5.4 Pro and $8 for Gemini 3.1 Pro Preview Custom Tools.
Choose GPT-5.4 Pro when you care most about larger context window.
Choose Gemini 3.1 Pro Preview Custom Tools when you care most about lower input-token price, and lower output-token price.
- On the standard 1M input plus 500K output workload, Gemini 3.1 Pro Preview Custom Tools is estimated at $8 vs $120 for GPT-5.4 Pro, saving $112 (93.3% lower).
- Gemini 3.1 Pro Preview Custom Tools is $112 cheaper on the standard workload (93.3% lower).
- Gemini 3.1 Pro Preview Custom Tools is $28 cheaper per 1M input tokens (93.3% lower; 15x difference).
- Gemini 3.1 Pro Preview Custom Tools is $168 cheaper per 1M output tokens (93.3% lower; 15x difference).
- GPT-5.4 Pro has 1.24K more context (1x larger).
| Feature | GPT-5.4 Pro (OpenAI) | Gemini 3.1 Pro Preview Custom Tools (Google) |
|---|---|---|
| Input Price prompt tokens per 1M | $30 | $2 |
| Completion Price per 1M tokens | $180 | $12 |
| Sample Workload Cost 1M input + 500K output | $120 | $8 |
| Context Window | 1.05M | 1.05M |
| Release Date |
Use-Case Decision Matrix
| Use case | Better pick | Why |
|---|---|---|
| Budget-constrained production | Gemini 3.1 Pro Preview Custom Tools | On the standard 1M input plus 500K output workload, Gemini 3.1 Pro Preview Custom Tools is estimated at $8 vs $120 for GPT-5.4 Pro, saving $112 (93.3% lower). |
| High-volume input processing | Gemini 3.1 Pro Preview Custom Tools | Lower prompt-token price matters most when prompts, retrieved passages, or documents dominate the bill. |
| Long responses and chatbots | Gemini 3.1 Pro Preview Custom Tools | Lower output-token price matters most when assistants generate many completion tokens. |
| RAG or long-document work | GPT-5.4 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-5.4 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b (free) can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.
- gpt-oss-20b can replace GPT-5.4 Pro when lower sample workload cost matters most: $0.1.
- gpt-oss-120b can replace GPT-5.4 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.
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