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Fable 5.1

AnthropicDropped Sep 1, 202663 builds57 makers13 prompts

Stronger long-horizon agentic coding and multistep research with 75% cheaper cache reads.

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About this release

What is Fable 5.1?

Claude Fable 5.1 is the generally available successor to Claude Fable 5. It extends the prior model with improved performance on demanding reasoning, long-running agentic coding, multistep research, and document/spreadsheet/slide work while keeping the same base token pricing and adding significantly cheaper cache reads. It features refined safeguards that reduce false positives on benign requests.

Read the official Anthropic launch page

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Playable38 Prompts13 More builds20

Playable

38

▶𝕏ToysHollowmarkA 3D interactive experience built with Three.js and frontier AI models.by Mindblown 🤯

𝕏VideoThe Book I Cannot ReadA code-generated film about the Voynich manuscript built with Python, Skia, and AIby Ethan Mollick

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𝕏agentDevin CLIThe frontier coding agent harness featuring lead-and-sidekick model pairing.

Browse all 63 Fable 5.1 builds in the feed

Built something with Fable 5.1?

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by Cameron

Prompts

13

▶𝕏AppsNode.js Native Single-Shot Response BuilderA high-performance native HTTP/1.1 response builder for Node.js.by Yagiz Nizipli

𝕏VideoThe Book I Cannot ReadA code-generated film about the Voynich manuscript built with Python, Skia, and AIby Ethan Mollick

𝕏agentClaude Code Effort LoopA systematic multi-stage workflow for building software with variable AI effort levels.by Thariq

𝕏agentDevin CLIThe frontier coding agent harness featuring lead-and-sidekick model pairing.by Cameron

More builds

20

▶𝕏AppsSotto Code AuditAn automated AI code-auditing and benchmarking dashboard.by Zach

𝕏agentJev LinkmapAutomate internal site linking with a System 1/System 2 AI architecture.by stas4000

▶𝕏VideoWhat happens to the brain while you’re learning?A cinematic AI visualization of neural connections forming during the learning process.by Higgsfield AI 🧩

▶𝕏ToysNiko Bellic AI BustA side-by-side 3D sculpting comparison between frontier models using Blender MCPby Alexey Fateev