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Tool
Category
Pricing
Free?
Updated
OpenAI Assistants API
AI Agents
Paid
—
Mar 2026
→
OpenAI managed API for building stateful AI agents with tools and persistent threads
Best for: OpenAI
Azure AI Foundry Agents
AI Agents
Paid
—
Mar 2026
→
Microsoft Azure platform for building and deploying enterprise AI agents securely
Best for: Azure