Anecdotally this is what I experienced, do you have sources for this?
It's purely circumstantial, but 6 Sol supports no reasoning (same as 6 Luna and 5.6 Sol/Luna), while both Astra and 6.1 Sol do not support "reasoning = none".
alt Hacker News
It's purely circumstantial, but 6 Sol supports no reasoning (same as 6 Luna and 5.6 Sol/Luna), while both Astra and 6.1 Sol do not support "reasoning = none".