1.4 also adds a lot of features so its more than a port. Plus Claude Code has been using the rust port since atleast July 19. So its definitely less than 3 months.
Or, more likely, the amount of crappy auto generated code and “features” they crammed into this release resulted in so many bugs that a “simple rewrite” would up being 3 months of whack-a-mole with the issues they created. That’s the predictable result from the lack of engineering discipline involved here.
Claude Code has millions of users and like I said had been using the 1.4 canary a lot earlier than 3 months. But even 3 months is an absurdly impressive timeline for this. And its even more insane to think LLMs are only going to get better. Jeez.