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Sierra Review (2026): Features, Pricing & Verdict
AI Tool Review · 2026 Sierra Review (2026): Features, Pricing & Verdict Sierra is the enterprise AI agent platform from Bret Taylor (ex-Salesforce co-CEO, OpenAI board chairman) and Clay Bavor — autonomous “Agent OS” agents that resolve customer conversations across voice, chat, email, SMS and WhatsApp, take real actions in your systems, and bill on…