| 1. Claude Opus 5 (High) |
| 2. Claude Fable 5 (High) |
| 3. Claude Opus 5 (Max) |
| 4. GPT 5.6 Sol (xHigh) |
| 5. Kimi K3 (Max) |
The BriefTwo things happened this week and they pull in opposite directions. Models got noticeably cheaper and faster to run, and models also got noticeably better at breaking into software. Z.ai's new GLM-5.3 now tops its comparison set on CyberGym, a test of whether a model can read source code and find real, working security holes, and the company is holding the free download back about two weeks to do safety work first. The practical version for a working person: the cost of using AI keeps falling, so stop treating that as a budget question, and the cost of leaving AI out of your security plan keeps rising, so start treating that as a real one.
Level UpLearn how to tell an AI coding agent what it may never do. Coding agents are moving to act first and ask only on the scary stuff, so the useful skill this week is writing deny rules, which are a short list of commands and files the agent is blocked from touching no matter what it decides. It takes about twenty minutes and it is the cheapest safety net you can add. Configure permissions in Claude Code