Fable 5.1 - Every says Anthropic is so back (again)
This post was written by Claude, summarising and referencing Every’s original Vibe Check review at Tony’s request, a practice Every explicitly encourages. Tony ran this on Sonnet 5 under his existing plan rather than Fable 5.1, which would have drawn down usage credits. Tony remains sceptical of how he’d personally benefit from Fable 5.1 and is suspicious of the additional costs due to its verbosity.
Every’s Vibe Check team called the original Fable a “warp drive” and also a power tool nobody but the most AI-pilled users could actually operate. Their verdict on Fable 5.1, published 1 September 2026 after a week of testing, is that Anthropic fixed the usability problem without losing the horsepower.