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@xpasky praises Matt Shumer's in-depth guide on getting the most out of Claude Fable 5, calling it a good and short guide with neat tricks.
The author shares their opinion that Codex and Claude Code can be used well for design, even without Fable 5, and mentions that the key to replicating design effects lies in imagination, while respecting the copyright of the original video teacher.
Claude Fable 5 is back online, and the prompts it writes can make Grok generate videos comparable to Seedance 2.5 in quality and feel at a 6x lower cost, with detailed portrait prompt examples.
The article emphasizes that when using strong reasoning models like Fable 5, one should prioritize auditing and reconstructing one's personal work operating system (such as coding, AI lab, content synthesis, etc.) rather than directly using them for coding. Through system-level upgrades, a compounding effect can be achieved, significantly improving the quality and efficiency of all subsequent outputs.
A user posts a comparison suggesting Fable 5 Low outperforms Opus 4.8 Max, with another user commenting that Fable 5 is back but being used incorrectly.
A step-by-step guide on building a second brain using Obsidian and the Fable 5 AI model, showing how to create a persistent knowledge base that improves AI outputs. The system uses plain text markdown files for memory, enabling agents to cite past decisions and produce more personalized results.
User iamai_omni praises Fable 5's self-correction ability, considering it comparable to ASI. Citing a recommendation from yibie, they point out that the Superpowers author had Fable 5 run an autoresearch loop, spending $165 to complete 25 experiments, increasing build speed by 50% and reducing token overhead by 60%, and documented failures and correction processes in detail.
Someone used Fable 5 in the Godot engine to create a demo of web-swinging through skyscrapers, with smooth visuals. The uploader says that when writing Godot code, Fable 5 produces noticeably fewer errors than GPT-5.5, and the code quality is more reliable, indicating that the gap between AI programming models in the game engine field is starting to show.
Superpowers 6 is released, using Fable 5 to run 25 autonomous experiments, improving build speed by 50% and reducing token costs by 60%, with detailed records of the experimental process and lessons from failures.
The same account first said Fable 5 had gotten weaker, then posted that Fable 5 is back, sharing a one-shot Minecraft-style demo showcasing its scene, lighting, and inventory capabilities, indicating the model's capability hasn't been fully removed.
This tweet introduces a Fable 5 Prompt structure that is suspected to be internally optimized by Anthropic, emphasizing that writing prompts should focus on goals, boundaries, and acceptance criteria rather than lengthy instructions. Especially for stronger models like Claude and Codex, avoid teaching the model how to think.
Discusses Fable 5's pricing at twice Opus, currently free via Claude subscription until July 7, after which pay-per-usage, with switching advice.
Someone used the Fable 5 model to generate a complete ink-wash style Roguelike game "Ink Guard" within five hours, including visuals, music, boss fights, and self-testing mechanisms, demonstrating the ability of AI to independently complete game development.
Anthropic confirms that access to Fable 5 via subscription ends on July 7, after which it will move to usage credits, but plans to restore it as a standard subscription model when capacity improves.
A user reports that Fable 5's new classifiers misrouted 75% of a coding session to Opus, flagging routine coding as a cybersecurity risk and causing unexpectedly high costs.
Fable 5's chain-of-thought reasoning was accidentally exposed in its web interface, revealing a rambling but endearing internal monologue.
Fable 5, a frontier model, returned with new safety guardrails that significantly degrade its performance on debugging, refactoring, and hallucination benchmarks, routing flagged requests to a less capable model (Opus 4.8), marking the end of an era for unrestricted access to advanced AI.
Tip to use Fable-5 as orchestrator and Codex as implementer to save credits, with a link to a library of composable AI agent skills for autonomous software development.
Fable 5 model generates a 644-line single-file HTML from a one-sentence description, achieving a realistic American flag fluttering effect including folds, lighting, and rhythm, all in one shot without any revision, demonstrating the AI's capability in complex code generation.
Fable 5 model only used 4 prompts and $173 worth of tokens to create a game called 'Super Smart Racing', demonstrating its extremely strong generative capabilities.