Anthropic's @felixrieseberg reveals the biggest lesson from Claude Code, which was built when Claude was still a terrible software engineer: "Boris first started showing a version of Claude Code internally in September 2024. The model was not there in any way. It was Sonnet 3.5, a pretty terrible software engineer. I think it was in the 30s for SWE-bench." "The products at the time were this human in the loop, slightly smarter autocomplete. The first versions of Cursor. But what Boris saw…