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Claude Fable 5

anthropic.com

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Re: Claude Fable 5

#371

Post by InsideOutSanta »

dannyw wrote: post #255

Impressions from testing Fable 5 prior to launch: • My most noticeable immediate jump was in how its frontend design was much more intentionally crafted, and delightful without feeling like 'AI vibe coded'; with better end-user usability too. • In some internal agentic harnesses, it achieved better results with about half the tokens, making it cost the ~same as Opus 4.8 price-wise! The real price increase is less tha…

After running it for half an hour: it's incredibly good at the visual aspects of UI design.

Re: Claude Fable 5

#372

Post by poszlem »

pietz wrote: post #53

> On June 23, we’ll remove Fable 5 from those plans. Using it after that will require usage credits. We've entered the phase where only companies will be able to afford state-of-the-art models.

Something I never thought I would utter: Here's hoping for china to surprise us.

Re: Claude Fable 5

#374

Post by unsupp0rted »

> Drug design: Using Mythos 5, our internal protein design experts accelerated aspects of the drug design process by around ten times. In one example, they found that Mythos 5, with protein design and bioinformatics tools but no human assistance, matches or beats skilled human operators. In doing so, the model executes all of the tasks that are normally completed by a scientist: choosing binding sites, selecting and running protein design tools, and recovering from failures along the way. Nine of the 14 protein targets from this study (shown below) yielded strong candidates for drug design that we’re currently investigating.

How is this half-way down the page? To me it's the headline.

Re: Claude Fable 5

#375

Post by jdrmar »

Homebrew is lagging a bit behind. If you want to use Fable right away, but still have claude code through homebrew, this is how you can do that manually:

Edit the cask locally:

  brew edit --cask claude-code
Set the version to 2.1.170 And set the sha256 to the correct values, which you can get by running

  curl https://downloads.claude.ai/claude-code-releases/2.1.170/manifest.json
Here's what I've used:

  version "2.1.170"
  sha256 arm:          "e903646d8b7a31882a80ecd27569a27d8ac57b3708745f349709632c84117fdf",
         x86_64:       "914f23a70bbed5d9ae567e3e04b86206ed9971b371bc9baca3f79c8885bfddb4",
         arm64_linux:  "1bb9d032440a75532f7dd4cafbc687f220aaf16c63eba17e192dfbec2f04bd25",
         x86_64_linux: "849e007277a0442ab27570d3e3d6d43787507946590e8dd1947e5a39b7081f9e"
Then run:

  export HOMEBREW_NO_INSTALL_FROM_API=1
  brew uninstall --cask claude-code
  rm -rf /opt/homebrew/Caskroom/claude-code
  brew reinstall --cask claude-code

Re: Claude Fable 5

#376

Post by maxloh »

I just tried using Fable 5 with Claude Code by asking it to create a LaTeX document for me.

There is no LaTeX compiler installed on my machine. It seems that Fable 5 is smart enough to download a compiler engine for me, and it kindly runs that remote binary without asking me first :)

  Support files are in place. No LaTeX compiler on PATH — let me check for a MiKTeX/TeX Live install elsewhere before writing the deck.
  
  Ran 2 commands
  
  Ran Search common LaTeX install locations
  Bash
  ls "/c/Program Files/MiKTeX"*/miktex/bin/x64 2>/dev/null | head -5; ls "/c/Users/[retracted]/AppData/Local/Programs/MiKTeX/miktex/bin/x64" 2>/dev/null | head -5; ls /c/texlive/*/bin/windows 2>/dev/null | head -5; ls /d/texlive /d/"Program Files"/MiKTeX 2>/dev/null | head; which tectonic latexmk 2>/dev/null; echo done
  done
  
  Ran Download portable Tectonic LaTeX engine
  Bash
  cd /tmp && curl -sL -o tectonic.zip "https://github.com/tectonic-typesetting/tectonic/releases/download/tectonic%400.15.0/tectonic-0.15.0-x86_64-pc-windows-msvc.zip" && unzip -o tectonic.zip && ./tectonic.exe --version
  Archive:  tectonic.zip
  Created by Cranko
    inflating: tectonic.exe            
  tectonic 0.15.0Tectonic 0.15.0
  
  Tectonic works. Now writing the bibliography and the full deck.
Opus 4.8 would just proceed without a compiler.

  Ran a command, used a tool

  Ran Check for LaTeX toolchain availability

  Bash
  cd "C:/Users/Mon/Downloads/Technical Writing" && for c in pdflatex xelatex latexmk bibtex; do printf "%s: " "$c"; command -v $c || echo "NOT FOUND"; done
  pdflatex: NOT FOUND
  xelatex: NOT FOUND
  latexmk: NOT FOUND
  bibtex: NOT FOUND
  
  Used PowerShell
  command: $cmds = @('pdflatex','xelatex','lualatex','latexmk','bibtex','miktex','tlmgr'); foreach ($c in $cmds) { $p = Get-Command $c -ErrorAction SilentlyContinue; if ($p) { "{0}: {1}" -f $c, $p.Source } else { "{0}: NOT FOUND" -f $c } }
  description: Check for LaTeX engines on Windows PATH
  pdflatex: NOT FOUND
  xelatex: NOT FOUND
  lualatex: NOT FOUND
  latexmk: NOT FOUND
  bibtex: NOT FOUND
  miktex: NOT FOUND
  tlmgr: NOT FOUND

  No LaTeX engine is installed locally, so I can't produce a PDF here — I did a careful structural review against the two prior (working) decks instead. The deck is written to disk and mirrors their template exactly. Here is the deliverable.

Re: Claude Fable 5

#377

Post by bottlepalm »

dannyw wrote: post #255

Impressions from testing Fable 5 prior to launch: • My most noticeable immediate jump was in how its frontend design was much more intentionally crafted, and delightful without feeling like 'AI vibe coded'; with better end-user usability too. • In some internal agentic harnesses, it achieved better results with about half the tokens, making it cost the ~same as Opus 4.8 price-wise! The real price increase is less tha…

I just ran it on a tough reverse engineering problem I'm having that neither Claude Code 4.8 or ChatGPT Codex 5.5 could figure out. 30 minutes later Fable has it all figured out perfectly.

Re: Claude Fable 5

#378

Post by frankfrank13 »

Not a lot of discussion on this, but there is no way to turn off data retention for this model. IME this is the first time Anthropic has released a model without allowing you to opt out.

Re: Claude Fable 5

#379

Post by jerryliu12 »

simonw wrote: post #46

Pelican for Fable 5 on default settings is a clear improvement on Opus 4.8 Fable 5 default: https://gist.github.com/simonw/036bee5a703e7ec84e34efa974438... Opus 4.8 (the "max" one is closest to Fable): https://simonwillison.net/2026/May/28/claude-opus-4-8/#and-s... Now here are the Fable pelicans for all five of the thinking effort levels - low, medium, high, xhigh, max: https://tools.simonwillison.net/markdown-svg-r…

Personally feel like it could be more ambitious with what it creates.

Re: Claude Fable 5

#380

Post by frankfrank13 »

victor106 wrote: post #95

> A new data retention policy Finally, we’re making a change to the way we handle business customer data for Fable 5, Mythos 5, and future models with similar or higher capability levels. We will require 30-day retention for all traffic on Mythos-class models, on both first- and third-party surfaces. We won’t use this data to train new Claude models, or for any non-safety-related purpose, and we’ve instituted new pri…

This makes it an instant non-starter for probably 95% of organizations. A lot of people are about to get in trouble for using it before realizing this.
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