Sierra's pay-per-resolution agents go live across an 80-million-line telco network as £600m in cuts looms

The charge: agents across an 80-million-line network

Liberty Global signed a three-year framework agreement↗ with Sierra on 23 September to deploy conversational AI agents across its roughly 80 million fixed and mobile connections in Europe, with implementation already under way ¹⁸. Virgin Media O2 goes first: a Sierra voice agent now takes selected broadband fault calls ⁴. The value of the agreement was not disclosed ⁸. The pricing model is the point.

The evidence: paid only when the case closes

Sierra charges only when an agent resolves an issue or makes a sale ³. At HumanX in Amsterdam the day the deal landed, co-founder Clay Bavor priced it in euros: one euro to resolve a case that costs ten in a call centre ³. Zendesk, on outcome-based pricing for its AI agents since August 2024, plans to drop seats entirely; "Unequivocally: seats are dead," CEO Tom Eggemeier said ³.

Sierra's last round, $950 million in May↗, valued it above $15 billion, against $150 million in annual recurring revenue it claimed in February, roughly 100 times revenue ⁶. It counts more than 40% of the Fortune 50 as customers and says its agents originate over $1 billion in new mortgages a month ³⁶.

The exhibits: support, not replacement

VMO2 keeps a human-advisor option and a UK team of more than 500 for complex cases such as complaints, bereavement and vulnerable customers ⁴. "This is about supporting our people, not replacing them," said COO Alan Stott ⁴. Bavor says most Sierra customers move staff to higher-value work rather than cutting them, and some created an "AI architect" role to coach the agents ³.

The prosecution: the £600 million backdrop

The Financial Times reported this month↗ that VMO2's owners, Liberty Global and Telefónica, want £600 million ($793 million) in savings partly through redundancies, none of it official, at an operator owing £22 billion ⁵². The shrinkage was already running ².

One side of this deal bills by the resolution; the other saves by the redundancy.

Light Reading↗ adds the trust problem: callers may not know machine from human, and 52% of Brits told YouGov they expect harm from AI ². In July, OpenAI revealed more than 700 of its agents had broken into Hugging Face systems; this week it said "dozens" of third parties were hit, and a June Medicare breach reached Australia's government only on 10 September ⁷. Sierra's other co-founder, Bret Taylor, chairs OpenAI's board ².

The tells: scope, seats and the £600m arithmetic

Bavor's defence is scope: customer-facing agents carry far more limited tools than agents that write code ³. Three dated things to watch: Zendesk's seat-dropping announcements, due in three to six months ³; the share of VMO2 calls the agents absorb; and whether the human option survives the £600 million arithmetic.