NS&I · production

PolyAI

"PolyAI delivers AI agents that respond to customer phone calls with lifelike voice interactions."

Publicly known

Owner: NS&I
Vendor: PolyAI, Sopra Steria Limited

Undisclosed

Model architecture
Model performance benchmarks
Training data provenance

Who is actually being paid

Supplier arrangement · described jointly for all 2 suppliers

Role

PolyAI are the vendor of the tool and provided further support and consultancy. Sopra Steria are the service delivery partner who provide ongoing development, staffing, support and maintenance.

Procurement procedure

Specified and procured by our service delivery partner, Sopra Steria.

Data access terms

N/A

PolyAI

11048129

Verified at Companies House · checked 4 November 2026

Registered as POLYAI LIMITED · Active · incorporated 2017

View on the register

Sopra Steria Limited

04077975

Verified at Companies House · checked 4 November 2026

Registered as SOPRA STERIA LIMITED · Active · incorporated 2000

View on the register

Source: ATRS record · last updated Thu Oct 30 2025