Fable 5.1 — Anthropic Finally Listened?

Prompt Engineering
16,542 views September 1, 2026

In this video, I break down Anthropic’s new Claude Fable 5.1 release, including its improved token efficiency, benchmark results, and what the new cache-read pricing means for real-world costs. LINKS: https://www.anthropic.com/claude-fable-and-mythos-5-1 https://pbs.twimg.com/media/HRJoa2QWIAAAOJX?format=png&name=4096x4096 https://x.com/cognition/status/2094849472119374145 https://pbs.twimg.com/media/HRJ4-32XgAAkK3P?format=jpg&name=4096x4096 Prompt Caching video: https://youtu.be/HDMqDV7mmGo My voice to text App: whryte.com Website: https://engineerprompt.ai/ RAG Beyond Basics Course: https://prompt-s-site.thinkific.com/courses/rag Signup for Newsletter, localgpt: https://tally.so/r/3y9bb0 💻 Pre-configured localGPT VM: https://bit.ly/localGPT (use Code: PromptEngineering for 50% off). Signup for Newsletter, localgpt: https://tally.so/r/3y9bb0

Keyboard shortcuts

On. Switch them off if they collide with your assistive tools; ? still opens this sheet.

Go to

Press g then the letter.

  • gh Latest
  • gs Sources
  • gm Media
  • gv Videos
  • gp Podcasts
  • gc Calendar
  • gd Decoder
  • gz Dataviz
  • ga Datasets
  • gb Blog
  • gk Markets
  • gj Careers
  • gn Prompt Notebook

On this page

  • / Focus search, where there is one
  • t Back to top
  • ? This list
  • Esc Close