Elena Rostova

Verified Masthead

Senior AI Systems Editor

Covering frontier reasoning models, sparse architectures, and high-performance neural inference. Former researcher at Cambridge Distributed Systems Group.

Domain Beat & Technical Expertise

Large Language ModelsTest-Time ComputeAI InfrastructureSparse Transformers

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Published Investigations & Analysis

1 article

Frontier AI•8 min read

Inside the Post-Transformer Era: Hybrid Test-Time Compute and the New Efficiency Frontier

As brute-force pre-training yields diminishing scaling returns, top AI labs are pivoting to test-time reasoning compute, mixture-of-agents routing, and sparse dynamic memory. Here is what engineering benchmarks reveal about actual inference costs.

Elena Rostova

March 11, 2026