
September 5, 2026 · 14 min read
Continual learning AI: what to build first
Continual learning AI is the idea that your product should get better the more people use it, instead of only when the next base model ships. Trajectory co-founder Arjun Karanam laid out what has to exist before any of it is possible, and almost none of it is machine learning. It is complete traces, a feedback path that captures corrections rather than ratings, evals drawn from your own traffic, and tool responses that say what actually happened. Here is the founder version, plus the one decision that makes it a system problem: what goes in the weights and what goes in the context.
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