Engineering Blog

Deep dives into our tech stack

To Cheap to Meter - Open Weight models in October 2026

Earlier today I saw that the 17 October release of Deepseek v4 Flash is even more efficient than previous versions, threatening dominance of american AI labs. GLM 5.3 Flash is already very cheap, I dug out some numbers from my inference provider for you to check.

Retort

At first I was bemused by Retort, Adrian Cockroft's whole stack coding agent evaluation tool. It is growing on me, and might be useful as a starting point for custom evals.

Swim the Test

Every application has some kind of workflow. Understanding larger workflows, making them cohesive and understandable to users and developers is non-trivial. I re-discovered Ward Cunningham's Swim the Test approach, this is the Further Reading section of future posts.