Hook

Their other posts in the index, biggest breakout first.
Researchers just found a way to make a closed AI model smarter. One thing about closed AI models like GPT or Claude is that you can't fine-tune them. The only thing you can actually control is the skill file that they read. You do not train the model - you train its instructions. And that is what turns out to be the whole secret here. What if you trained that document like you trained the weights? Basically gradient descent, but in text. Weights become words, gradient becomes an edit, loss becomes a benchmark score. They call it SkillOpt. It runs the agent, scores work failed, and the second model proposes tiny edits such as adding a line, cutting a line, rewriting a line, so on and so forth. But here's what keeps it from breaking. Every edit has to prove itself on a held-out set. It needs to beat the score or it's reverted. So small steps only. Only strictly-better edits survive. What it buys you: This means that the skill teaches itself, almost +24.8 on GPT-3.5 Codex loop. Beats: hand-written, one-shot, TextGrad, GEPA, EvoSkill. Ported, not retrained. As fine-tuning. It is just a file, so it transfers to other models. The model never moved, the skill grew up.