Google: Gemini 3.1 Pro Preview Custom Tools

Google's Gemini 3.1 Pro Preview Custom Tools demonstrates exceptional reliability, achieving a 100% success rate across all benchmarks, indicating consistent and stable operation. While its speed performance is moderate, ranking in the 22nd percentile, its pricing tends to be at premium levels, positioned in the 5th percentile. This specialized variant excels in improving tool selection behavior, particularly in complex multi-tool workflows and coding agents, by prioritizing efficient third-party or user-defined functions over general bash tools. The model exhibits outstanding accuracy in critical areas such as Hallucinations (100%), Reasoning (100%), and Ethics (100%), often achieving perfect scores and being the most accurate at its price point and speed. It also shows strong performance in Instruction Following (94.9%), Coding (96.9%), and Mathematics (95.9%), placing it in the top percentiles for these categories. Its General Knowledge (99.5%) is robust, though its Email Classification (97.0%) is more moderate. The core strengths lie in its multimodal reasoning, 1M-token context window, and enhanced function calling reliability, making it highly suitable for sophisticated software engineering tasks.