Gemini 3.1 Pro Preview Custom Tools vs Gemini 3 Flash Preview
How do these models stack up? Below is an expert side-by-side comparison of specifications, context window capacity, live pricing per million tokens, and standardized benchmark scores for Gemini 3.1 Pro Preview Custom Tools and Gemini 3 Flash Preview.
Gemini 3.1 Pro Preview Custom Tools
Gemini 3.1 Pro Preview Custom Tools is a variant of Gemini 3.1 Pro that improves tool selection behavior by preventing overuse of a general bash tool when more efficient third-party...
Gemini 3 Flash Preview
Gemini 3 Flash Preview is a high speed, high value thinking model designed for agentic workflows, multi turn chat, and coding assistance. It delivers near Pro level reasoning and tool...
Technical Specifications
| Specification | Gemini 3.1 Pro Preview Custom Tools | Gemini 3 Flash Preview |
|---|---|---|
| Provider | ||
| Context Window | 1,048,756 tokens | 1,048,576 tokens |
| Agent Suitability | N/A | N/A |
| Time to First Token (TTFT) | N/A | N/A |
| Deployment Model | managed api | managed api |
| Production Stability | beta | beta |
| API Available | Yes | Yes |
| Released Date | 2026-02-25 | 2025-12-17 |
API Pricing Comparison
Input Price per Million Tokens
Gemini 3.1 Pro Preview Custom Tools
$2.00
Gemini 3 Flash Preview
$0.50
Output Price per Million Tokens
Gemini 3.1 Pro Preview Custom Tools
$12.00
Gemini 3 Flash Preview
$3.00
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Benchmark Performance Metrics
Scores show the raw performance percentages verified across key evaluation suites. Higher bars indicate superior accuracy and capability in that domain.
Gemini 3.1 Pro Preview Custom Tools Quirks & Gotchas
No developer gotchas reported.
Gemini 3 Flash Preview Quirks & Gotchas
No developer gotchas reported.