Sierra AI Reaches ~$150M ARR in Under Two Years — Voice Agents Surpass Text as Primary Channel, Outcome-Based Pricing Proves at Scale

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Sierra, Bret Taylor's AI customer service platform, reached an estimated $150–165M ARR by early 2026, up from $26M at end of 2024 — one of the fastest ARR ramps in enterprise software history. The architectural signal: voice agents surpassed text as Sierra's primary interaction channel by September 2025, indicating AI-native customer service is moving beyond chatbots into full voice resolution. Sierra's $0.99-per-resolution outcome-based pricing — only charging for fully resolved conversations without human escalation — is the direct commercial threat to Zendesk's per-seat model.

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Sierra AI Reaches ~$150M ARR in Under Two Years — Voice Agents Surpass Text as Primary Channel, Outcome-Based Pricing Proves at Scale | MindPattern