When a foundation model can do almost anything, what determines where it shouldn’t be deployed?
Foundation models generate outputs that look correct. At scale, that is commercially powerful — until it meets the edge cases that training data didn’t cover, the regulatory requirements that text generation doesn’t satisfy, and the customer expectations that a confident-but-wrong response fails. The Klarna case is not a story about AI being bad. It is a story about the gap between a model that generalises well and a deployment that succeeds.
Storey et al. (2025) define foundation models by three properties that distinguish them from all previous AI systems. These are not marketing terms — they are the mechanisms that make foundation models both powerful and risky.
GPT-4 trained on roughly 1 trillion tokens. This is not incremental improvement — at sufficient scale, qualitatively new capabilities emerge that were not present in smaller models.
GPT-3 could do arithmetic it was never taught. GPT-4 can reason about novel ethical dilemmas. These capabilities were not in the training objectives. They emerged from scale. This is why foundation models surprise even their creators.
Most enterprise AI tools in 2026 are GPT-4, Claude, or Gemini with a wrapper. This concentrates risk: a bias or flaw in the foundation model propagates to every application built on it.
In February 2024, Klarna announced its AI assistant had handled 2.3 million customer service conversations in its first month — the equivalent of 700 full-time agents. The metric was impressive. What happened next was instructive.
The deployment boundary of a foundation model is not determined by the model’s capability. It is determined by the task’s tolerance for error — and who bears the consequences when the model is wrong.
What are the three defining properties of foundation models in Storey et al.’s framework — and what risk does each introduce?
Walk through the Klarna arc: what happened in Month 1, what degraded in Months 2–6, and what does the outcome reveal?
Storey et al. say “generalisation ≠ reliability in deployment.” What determines the deployment boundary of a foundation model?