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I am wondering why the codex repo is open source ? Can they afford it to be open source in the longer run ?

Not much point making it closed source at this point, coding agent harnesses are trivial to reverse-engineer.

Being open source was also a useful community lever they could pull when they were trying to catch up with Claude Code.

Not much point making anything closed source at this point, if the client has access to the binary.

What do you mean “afford”?