Disclosure: We link out to every tool we test. None of the five tools below currently has a confirmed, active affiliate relationship with us, so nothing here is commission-motivated.

Go doesn't leave much room for "almost right." gofmt means there's one accepted formatting. Explicit error returns mean there's no ambiguity about whether a function can fail. So instead of asking which AI coding tool "feels" best for Go, we gave five of them the same production bug and the same four project types — an HTTP service, a CLI, a gRPC microservice, and a concurrent worker pool — and watched what they actually did with it.

The bug

A worker pool was occasionally leaking goroutines under load. The real cause: a select statement that didn't handle context cancellation, so workers blocked forever on a channel send after the parent context was cancelled.…