
The open-closed performance gap is driven by evolving benchmarks, differing training domains, and industry shifts, with open models struggling to keep up due to limited evidence on their capabilities in newer domains. Leading open model labs are supported by data industry dynamics, creating a disparity in performance and relevance. Economic pressures and the adoption of coding and terminal tasks favor open models, but their ability to maintain performance in complex, agentic tasks remains a challenge.
Reflections on AI's writing ability and how AI models get more capable.

After a few long years of finding time to document my lessons from training open models, my post-training book is done!

Musings on model alignment, what determines safety, and where we go from here.
