←── back to feed
/topics/claude-fable-5-1-and-mythos-5-1-release
Claude Fable 5.1 and Mythos 5.1 release
7 items●3 sources●updated 15d ago●trend 0
Anthropic released Claude Fable 5.1 and Claude Mythos 5.1, with Fable 5.1 becoming the most capable publicly available AI model at release. The update includes improved system prompts focused on copyright compliance and enhanced 3D modeling and multimodal capabilities.
- Fable 5.1 ranked most capable publicly available model at September 2026 release
- System prompt updates restrict song lyric reproduction and copyrighted character generation
- Fable 5.1 demonstrates advanced 3D modeling capabilities for complex historical reconstruction tasks
- Two models released simultaneously: Fable 5.1 and Mythos 5.1
- Agents can autonomously refine outputs using real images and archaeological data sources
[HN]hacker news3
Claude Fable 5.1 vs. GPT-6 Astra, who wins on the 3D modeling?
Fable 5.1 is the new frontier on artificialanalysis
Prompting Claude Fable 5.1 and Claude Mythos 5.1
[BLG]blog/rss2
Claude Mythos 5.1 and Fable 5.1: Capabilities
Claude Fable 5.1 and Mythos 5.1: The System Card
[BSKY]bluesky2
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…
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...