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Tool
Category
Pricing
Free?
Updated
Vertex AI Reasoning Engine
AI Agents
Paid
—
Mar 2026
→
Google Cloud managed runtime for deploying and scaling AI agents in production
Best for: Google Cloud
OpenAI Assistants API
AI Agents
Paid
—
Mar 2026
→
OpenAI managed API for building stateful AI agents with tools and persistent threads
Best for: OpenAI