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Tools2026-08-15 · source-backed
Buried in the 2.1.233 notes. The harness is removing explicit planning scaffolding for the newer tier while keeping it for older models, betting these models track multi-step work internally and that a forced todo list burns tokens without improving completion. Claude Code Releases If your CLAUDE.md, skills, or hooks reference todo state, check whether those instructions are now dead code on your pinned model.
Each link below shares sources, entities, or timing with this story.
Claude Code uses Sonnet / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Sonnet); both cover Claude, Claude Code, Fable, Mythos; overlapping topics (claude, code, fable).
Anthropic released Fable / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Fable); both cover CLAUDE, Claude Code, Fable, Mythos; overlapping topics (claude, fable, model).
Claude Code uses Sonnet / Shared entities / Same source domain / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Sonnet); both cover Claude, Claude Code, Opus, Sonnet; reported by the same outlet (github.com).
Anthropic released Fable / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Anthropic released Fable); both cover Claude, Fable, Mythos, Opus; overlapping topics (code, fable, model).
Linked by a graph relationship (Anthropic released Fable); both cover Claude, Fable, Opus, Sonnet; overlapping topics (claude, fable).
Linked by a graph relationship (Anthropic released Fable); both cover Claude Code, Fable, Mythos, Opus; overlapping topics (code, model).
Claude Code uses Sonnet / Shared entities / Shared topic / Earlier coverage / Tension
Linked by a graph relationship (Claude Code uses Sonnet); both cover Claude, Claude Code, Opus, Sonnet; overlapping topics (claude, code).
Anthropic released Fable / Shared entities / Shared topic / Earlier coverage
Linked by a graph relationship (Anthropic released Fable); both cover Claude, Claude Code, Fable, Opus; overlapping topics (claude, code, model).