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Tool
Category
Pricing
Free?
Updated
OpenAI Assistants API
AI Agents
Paid
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Mar 2026
→
OpenAI managed API for building stateful AI agents with tools and persistent threads
Best for: OpenAI
Slack AI
AI Productivity
From $10/mo
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Mar 2026
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AI-powered channel summaries, thread catch-ups, and smart search in Slack.
Best for: productivity