You don’t need a smarter AI model. You need a better harness.
A raw model can reason, but it does not automatically have your files, memory, tools, permissions, or a reliable way to know whether the job actually finished.
Same model. Same prompt. Different system. Completely different result.
The harness is the operating system around the model. It controls what the model sees, what it can do, what it remembers, and whether the output gets checked.
Choose a strong model—but judge the harness by whether it can reach verified done.