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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.
Terminal-Bench 2.1 results (entries dated June 17) put Codex CLI on GPT-5.5 first at 83.4%, Claude Code on Fable 5 second at 83.1%, and Claude Code on Opus 4.8 at 78.9%. The asterisk matters more than the ranking: Fable 5 and Mythos 5 have been export-suspended since June 12,...
On June 9, Anthropic released Claude Fable 5 and Mythos 5 across Claude.ai, Claude Code (CLI and web), and Cowork. The spec sheet: 1M-token context, 128K max output, a January 2026 knowledge cutoff, and pricing at $10 input / $50 output per million tokens. That's double Opus 4...
A GitHub repo cataloging Claude Code tips doesn't normally warrant a top story. But shanraisshan/claude-code-best-practice at 53.4K stars isn't a tips list anymore. It's the de facto reference for how an entire generation of developers is learning to work with AI coding agents...
The changelog through 2.1.235 (code.claude.com) confirms the todo-tool removal from Opus 4.8, Sonnet 5, Fable 5, and Mythos 5+ that ran here on 2026-08-15 is restorable with that flag. Everything else in this window has already been covered: the Bash memory cgroups and the tod...
This one's been building for days and it crystallized this week. Per The Register, the incident behind the US export-control block on Anthropic's Fable 5 and Mythos 5 wasn't a jailbreak or a guardrail bypass. It was a plain three-word prompt, "fix this code," run against CVE-l...
Anthropic commissioned the independent evaluator to test 72 injection scenarios, held out from Anthropic, each run 10 times against Fable 5, Opus 5, and Sonnet 5 as of July 17. Clean sweep. TechCrunch has the details. A third-party held-out eval is a much stronger claim than i...
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