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Sierra adds conversation models, voice controls and monitoring to Agent OS

At its summit, Sierra announced Curie for conversation orchestration, Fleming for detecting another agent on a call, Tandem Voice, a voice Persona Studio and a reworked Ghostwriter for customer-agent monitoring. These are Sierra platform capabilities; the post does not establish independent model weights or broad API availability. Reported customer gains are Sierra claims.

Sierra

Agent OS summit updates

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Primary source · Sierra · October 6, 2026

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