Google: Gemini 3.1 Pro Preview vs Google: Gemini 3.1 Pro Preview Custom Tools: Which AI Model Is Better?
Updated March 24, 2026· Based on independent benchmark data
Quick Verdict
Google: Gemini 3.1 Pro Preview and Google: Gemini 3.1 Pro Preview Custom Tools are virtually tied on intelligence (57.2 vs 57.2).
Head-to-Head Comparison
| Metric | Google: Gemini 3.1 Pro Preview | Google: Gemini 3.1 Pro Preview Custom Tools |
|---|---|---|
| Intelligence Score | 57.2 | 57.2 |
| Coding Score | 55.5 | 55.5 |
| Math Score | N/A | N/A |
| Speed (tok/s) | 117 tok/s | 117 tok/s |
| Latency (TTFT) | 21.91s | 21.91s |
| Input Price / 1M tokens | $2.00 | $2.00 |
| Output Price / 1M tokens | $12 | $12 |
| Context Window | 1.0M | 1.0M |
| Max Output Tokens | 66K | 66K |
| Input Modalities | Audio + File + Image + Text + Video | Text + Audio + Image + Video + File |
| Output Modalities | Text | Text |
| Free Tier | No | No |
Detailed Analysis
Intelligence & Quality
Google: Gemini 3.1 Pro Preview and Google: Gemini 3.1 Pro Preview Custom Tools perform similarly on overall intelligence, scoring 57.2 and 57.2 respectively. Their coding capabilities are closely matched (55.5 vs 55.5).
Speed & Latency
Both models deliver similar output speeds: Google: Gemini 3.1 Pro Preview at 117 tok/s and Google: Gemini 3.1 Pro Preview Custom Tools at 117 tok/s. Time to first token is 21.91s for Google: Gemini 3.1 Pro Preview Custom Tools vs 21.91s for Google: Gemini 3.1 Pro Preview, which affects perceived responsiveness in interactive applications.
Pricing
Google: Gemini 3.1 Pro Preview Custom Tools is more affordable at $2.00/1M input tokens ($12/1M output), while Google: Gemini 3.1 Pro Preview costs $2.00/1M input ($12/1M output). For a typical workload of 100 requests per day at 2,000 tokens each, Google: Gemini 3.1 Pro Preview would cost approximately $12.00/month vs $12.00/month for Google: Gemini 3.1 Pro Preview Custom Tools in input costs alone.
Context Window
Both models support the same context window of 1.0M tokens (approximately 524 pages of text).
Frequently Asked Questions
Is Google: Gemini 3.1 Pro Preview better than Google: Gemini 3.1 Pro Preview Custom Tools for coding?
Google: Gemini 3.1 Pro Preview and Google: Gemini 3.1 Pro Preview Custom Tools have identical coding scores of 55.5.
Which is cheaper, Google: Gemini 3.1 Pro Preview or Google: Gemini 3.1 Pro Preview Custom Tools?
Google: Gemini 3.1 Pro Preview Custom Tools is cheaper at $2.00/1M input tokens vs $2.00/1M for Google: Gemini 3.1 Pro Preview.
Is Google: Gemini 3.1 Pro Preview faster than Google: Gemini 3.1 Pro Preview Custom Tools?
Both models have similar output speeds of around 117 tok/s.
Can Google: Gemini 3.1 Pro Preview process images?
Yes, Google: Gemini 3.1 Pro Preview supports image input. Google: Gemini 3.1 Pro Preview Custom Tools also supports images.
Which has a larger context window, Google: Gemini 3.1 Pro Preview or Google: Gemini 3.1 Pro Preview Custom Tools?
Both models have the same context window of 1.0M tokens.
Should I use Google: Gemini 3.1 Pro Preview or Google: Gemini 3.1 Pro Preview Custom Tools?
Both models perform similarly on intelligence benchmarks. Choose based on specific needs: pricing, speed, context window, or provider ecosystem.
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Benchmark data by Artificial Analysis
Data last synced: March 24, 2026