←── back to feed
/topics/claude-fable-5-1-release-and-capabilities
Claude Fable 5.1 release and capabilities
22 items●2 sources●updated 16d ago●trend 0
Anthropic released Claude Fable 5.1, an updated model with improved capabilities for long-running agentic work and complex creative tasks like generating interactive 3D visualizations and procedural graphics. The update includes tightened restrictions on copyright content and song lyrics, higher costs for extended thinking ($3.30+ per query), and demonstrated performance on benchmarks including ARC-AGI and historical cryptography tasks.
- Fable 5.1 excels at multi-step agentic tasks requiring judgment and taste, including generating interactive 3D ship catalogs and procedural shaders with no premade assets
- System prompt now explicitly restricts reproducing song lyrics and drawing copyrighted characters, compared to Fable 5
- Extended thinking (Max level) available but expensive; one SVG animation example cost $3.30
- Successfully decoded a 17th-century royalist message and generated complex visualizations like neo-gothic ocean scenes and animated SVG graphics
- Demonstrated results on ARC-AGI benchmark; less improvement in reducing characteristic 'Claudish' language patterns versus prior version
[HN]hacker news14
Claude Fable 5.1 Benchmark: Draw a Python Reading a Book
Claude Fable 5.1 decoded a centuries-old royalist message hidden in since 1653
The Double Matthew Walker Knot by Fable 5.1
Claude Fable 5.1 watermark: It has a blind spot developers can't ignore
What's new in Claude Fable 5.1
Claude's new system prompt doesn't want to reproduce song lyrics
Claude Fable 5.1 tightens restrictions on reusing thinking blocks
Claude Fable 5.1 made me a nice animated pelican
Claude Fable 5.1 results on ARC-AGI
Fable 5.1
Fable 5.1 System Card
Claude Fable 5.1 and Claude Mythos 5.1
Claude Fable 5.1
Claude Fable 5.1
[BSKY]bluesky8
Fable 5.1: "Create the Catalog of Ships from the Iliad with a map, etc. i should be able to explore each accurate ship in 3D. there should be real images & archeological data i can draw on. test it with agents to make it accurate & beautif…
10 months between these two visions of how ChatGPT agents work.
I wrote some notes on what's new in the (published) Fable 5.1 system prompt in comparison to Fable 5 - it's mostly about not reproducing song lyrics and avoiding drawing copyrighted characters simonwillison.net/2026/Sep/2/c...
These 3 pages (from before AI) on complex systems are worth reading
Here is Fable 5.1's shader: "create a visually interesting shader that can run in twigl, make it like an infinite city of neo-gothic towers partially drowned in a stormy ocean with large waves" (this is all done with math, no premade asse…
A few notes on Anthropic's new Claude Fable 5.1 - with Max thinking level I got the best SVG pelican I've had from any Anthropic model (at a hefty cost of $3.30!), which I then had it animate simonwillison.net/2026/Sep/1/c...
With agents, we are at another large gap between AI abilities & public perception. Exponential gains mean that the gap is growing over time.
Had early access to Claude Fable 5.1. Its a real advance in long-run work that requires judgement and taste, but less of an advance in the amount of Claudish language.