Builder brief

Claude Opus 5.5

What hands-on builders are publishing about Claude Opus 5.5, with the source behind every claim.

64builders found

142source records

2transcript-backed views

Free evidence

What builders are showing

Direct statements are shown first. Coverage is not treated as an opinion.

Official update2026-09-01

Claude Fable 5.1 and Claude Mythos 5.1

Official update2026-09-22

Claude Opus 5.5 announced

Official update2026-09-28

Claude Sonnet 5.5 announced

Direct quote2026-07-24

Fable 5, which I still think is the best model right now, will only be available if you're paying $100 a month for Claude.

A mention proves coverage, not endorsement. Transcript-backed statements are labelled separately.