❯ Fable 5.1 and Opus 5.1 said to slip to next week, though Anthropic never announced either

what is circulatingPosts on social platforms claim Fable 5.1 and Opus 5.1 were set for release on August 28 and have slipped to next week, with some people said to already have access. The caveat comes first: Anthropic has never officially announced either model, so the “delay” is a community expectation window moving, not a confirmed schedule change.

how much to trust itThe claim so far traces to a single leak-tier account, with no official statement, no reporter follow-up, and no verifiable product page or documentation. More than one version of the date is circulating, which is itself a sign of an unstable source. By contrast, GLM-5.3’s weights and Tencent’s Hy4 landed the same day as downloadable, checkable artifacts.

how to use thisTeams scheduling model selection should treat it as a prompt rather than a basis: leave slack for a new version arriving, but do not move a launch plan on an unverified date.

▪ SIGNALA model that was never announced cannot be delayed; what is worth noting is how far release timing is now driven by outside expectations.