Last verified 2025-11-26 (left) · 2025-11-26 (right)
Gemini 3 Pro Preview vs GPT-5.1 — Pricing & Capability Comparison
Gemini 3 Pro Preview charges $2.00 per million input tokens and $12.00 per million output tokens. GPT-5.1 comes in at $1.25 / $10.00. Context windows span 2M vs 200K tokens respectively.
TL;DR — Quick Comparison
- ✓GPT-5.1 is cheaper overall: $11.25 per 1M tokens (in+out) vs $14.00 for Gemini 3 Pro Preview — saves $2.75 per 1M tokens
- ✓Input pricing: Gemini 3 Pro Preview $2.00/1M vs GPT-5.1 $1.25/1M
- ✓Output pricing: Gemini 3 Pro Preview $12.00/1M vs GPT-5.1 $10.00/1M
- ✓Context window: Gemini 3 Pro Preview offers more (2M vs 200K)
- ✓Use our calculator below to estimate costs for your specific usage pattern
Input price (per 1M)
Gemini 3 Pro Preview
$2.00
GPT-5.1
$1.25
GPT-5.1 leads here
Output price (per 1M)
Gemini 3 Pro Preview
$12.00
GPT-5.1
$10.00
GPT-5.1 leads here
Context window
Gemini 3 Pro Preview
2,000,000 tokens
GPT-5.1
200,000 tokens
Gemini 3 Pro Preview leads here
Cached input
Gemini 3 Pro Preview
$0.200
GPT-5.1
$0.125
GPT-5.1 leads here
Cost comparison for 10K-token workloads
Side-by-side pricing for identical workloads (10,000 total tokens per request) across different distributions.
| Scenario | Gemini 3 Pro Preview | GPT-5.1 | Gemini 3 Pro Preview cached | GPT-5.1 cached |
|---|---|---|---|---|
Balanced conversation 50% input · 50% output | $0.0700 | $0.0563 | $0.0610 | $0.0506 |
Input-heavy workflow 80% input · 20% output | $0.0400 | $0.0300 | $0.0256 | $0.0210 |
Generation heavy 30% input · 70% output | $0.0900 | $0.0738 | $0.0846 | $0.0704 |
Cached system prompt 90% cached input · 10% fresh output | $0.0300 | $0.0212 | $0.0138 | $0.0111 |
Frequently asked questions
Which is cheaper: Gemini 3 Pro Preview or GPT-5.1?
GPT-5.1 is cheaper for input tokens at $1.25 per 1M tokens compared to $2.00. For output, GPT-5.1 costs $10.00 per 1M tokens versus $12.00 for Gemini 3 Pro Preview.
What is the cost per 1M tokens for Gemini 3 Pro Preview?
Gemini 3 Pro Preview pricing: $2.00 per 1M input tokens and $12.00 per 1M output tokens. Context window: 2,000,000 tokens.
What is the cost per 1M tokens for GPT-5.1?
GPT-5.1 pricing: $1.25 per 1M input tokens and $10.00 per 1M output tokens. Context window: 200,000 tokens.
How much does it cost per 1K tokens?
Per 1K tokens: Gemini 3 Pro Preview costs $0.0020 input / $0.0120 output. GPT-5.1 costs $0.0013 input / $0.0100 output. This is useful for calculating small-scale usage costs.
Which model supports a larger context window?
Gemini 3 Pro Preview offers 2,000,000 tokens (2M) versus 200K for GPT-5.1.
What is the estimated monthly cost for typical usage?
For a typical workload of 10M input + 2M output tokens per month: Gemini 3 Pro Preview would cost approximately $44.00, while GPT-5.1 would cost $32.50. GPT-5.1 is more economical for this usage pattern.
Do these models support prompt caching?
Gemini 3 Pro Preview supports prompt caching at $0.200 per 1M cached tokens, reducing costs for repeated context by up to 90%. GPT-5.1 supports caching at $0.125 per 1M tokens, saving up to 90%.
Which model is best for my use case?
Choose GPT-5.1 for cost-sensitive applications with high input volume. Choose Gemini 3 Pro Preview if you need 2M context for long documents or conversations. Consider prompt caching if you have repeated context. Use our token calculator to model your specific usage pattern.