[BUG] Claude 4.7, 4.8, 5.0, and Fable increasingly default to repetitive rhetorical tics and often struggle to produce coherent prose despite explicit style instructions

A bug report on Anthropic's public Claude Code repository, filed in July 2026 and built on a Reddit thread with more than 450 upvotes, says that since Opus 4.8 the models' default writing has become hard to read: made-up jargon, "It is not Y. It is X." constructions, forced metaphors, density mistaken for concision, and style instructions that drift back after a few turns. By early October it had 575 reactions and 138 comments. The one reply from a collaborator could not reproduce the problem in a non-interactive test, said that did not refute the report, classed it as model-behaviour feedback rather than a Claude Code bug, and drew 189 thumbs-down. The reporter closed the issue on 3 October, saying the 5.5 generation of models had addressed it; at least one later comment disputes that.

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