The Google Vertex AI Pricing Calculator itself is a free-to-use tool for estimating costs. However, the underlying Vertex AI services it calculates are subject to a freemium model with usage-based pricing. A free tier is available, including $300 in Google Cloud credits for 90 days for new accounts and rate-limited access to some Gemini models (up to 1,000 requests/day). Paid services vary significantly by usage, model type, inference volume, training compute, and region. For instance, new Gemini models include Gemini 2.5 Flash-Lite at $0.10 per million input tokens and $0.40 per million output tokens, Gemini 2.5 Pro starting at $1.25 per million input tokens and $10.00 per million output tokens, and Gemini 3 Flash at $0.50/$3.00 per million tokens. Video generation models like Vertex AI Veo 3 cost $0.50 per second for video-only and $0.75 per second for video with audio, with Veo 3.1 Fast starting at $0.10 per second without audio. Billing for Vertex AI Agent Engine sessions and Memory Bank commenced on February 11, 2026, with a free tier of 50 vCPU-hours and 100 GB-hours of memory per month.