Gemini 3.5 Flash (Vertex AI, EU)

Gemini 3.5 Flash is positioned as a fast model in the Gemini Flash family, balancing multimodal reasoning, tool use, and cost for real-world applications. Its closed-weight design places it among proprietary offerings, while the available evidence emphasizes practical performance rather than documented architectural or training-scale details.

The model is best suited to agentic workflows, sub-agent deployment, multi-step tasks, and long-running applications that benefit from reasoning combined with tool calling. Independent usage data from Requesty reports roughly 197 generated tokens per second in aggregate and a 967-millisecond best first-token time across the listed Google routes, supporting a fit for latency-sensitive, high-volume work. Provider routes can differ in speed and cost, so the EU-specific endpoint should be evaluated against the exact workload and route.