Professor James Whittington and Dr Ruairidh Battleday unveil breakthrough from stealth frontier AI lab | Sifted

Professors James C. R. Whittington and Ruairidh McLennan Battleday, cofounders of a stealth AI research laboratory called Prefrontal, have released research on a method the article names Latent Sparse Attention, according to a Sifted report. The headline presents the work as a breakthrough from the stealth frontier AI lab, and the article identifies both men by their academic titles as well as by their cofounder roles at Prefrontal.

As described in the article, Latent Sparse Attention groups related information into clusters by meaning rather than by position in a sequence. The reported results include 72.4x faster attention-layer prefill compared with full attention, and up to 9.2x faster time to first token in an end-to-end model-serving evaluation. Those two figures are the quantitative claims carried in the excerpt: one covers the attention layer in isolation, the other covers time to first token measured across a full serving setup.

The excerpt does not state the model size, hardware configuration, context length or accuracy benchmarks behind either figure, nor whether the research has been peer reviewed or released alongside code or weights. It also does not say how Latent Sparse Attention compares with full attention on answer quality, since the comparisons given are speed comparisons. Prefrontal is described as a stealth lab, and the article does not state its funding, headcount or product plans, nor how far the method has been tested beyond the serving evaluation described.