Gradient Labs Provides AI Account Managers to Every Bank Customer

Gradient Labs is building AI agents that handle complex financial support workflows with high accuracy and low latency using GPT-4.1 and GPT-5.4 mini/nano. The London-based startup aims to provide every bank customer with an experience equivalent to having a dedicated account manager.

In particular, through the GPT-5.4 mini and nano models, the company achieved latency at the 500ms level, enabling natural voice conversations. Gradient Labs adopted OpenAI models to meet the following key requirements:

• Accuracy of instruction-following
• Low hallucination rate
• Reliable function-calling capability

The system evaluates performance based on Trajectory accuracy. In initial evaluations, GPT-4.1 recorded a 97% trajectory accuracy, showing overwhelming performance compared to the next-best provider (88%).

The architecture adopts a hybrid structure that uses OpenAI models for reasoning-focused stages and smaller models for fast, deterministic tasks. In addition, the company runs 15+ guardrail systems in parallel to prevent things such as financial advice detection and attempts to bypass identity verification.