Something that bothers me here is that Anthropic claimed in their blog post that the Linux kernel could boot on x86 - is this not actually true then? They just made that part up?

It seemed pretty unambiguous to me from the blog post that they were saying the kernel could boot on all three arch's, but clearly that's not true unless they did some serious hand-waving with kernel config options. Looking closer in the repo they only show a claimed Linux boot for RISC-V, so...

[0]: https://www.anthropic.com/engineering/building-c-compiler - "build a bootable Linux 6.9 on x86, ARM, and RISC-V."

[1]: https://github.com/anthropics/claudes-c-compiler/blob/main/B... - only shows a test of RISC-V