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Claude Fable 5.1: Pricing, Benchmarks, and the Safeguard Tax

This story is from 2026-09-02. It is preserved in the archive; the latest stories are on the live feed.

Claude Fable 5.1 explained: pricing, benchmarks, API changes, Mythos 5.1 comparison, and Anthropics measurable safeguard overhead. Last verified: September 2, 2026 Continue reading on Substack →

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  1. 2026-09-02 16:17 · DEV Community — AI
    Claude Fable 5.1: Pricing, Benchmarks, and the Safeguard Tax

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  3. OpenAI discloses six new safety incidents — Axios AI+
  4. Claude, Anthropic’s AI model, is helping to develop the next version of itself — Fast Company AI
  5. Anthropic adds support for the AGENTS.md instructions spec to Claude Code; OpenAI contributed AGENTS.md to the Agentic AI Foundation last year (Thomas Claburn/The Register) — Techmeme
  6. A zero-click RCE flaw in AI coding agents could have exposed enterprise systems — InfoWorld AI
  7. Researchers used Claude to hack OpenAI — Ars Technica AI
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