Claude Fable 5.1
Anthropic's model for demanding reasoning and long-horizon agentic work.
From $10 in / $50 out per 1M tokensLong, hard agent runs where quality comes first
Batch API is 50% off. Prompt caching lowers repeat input cost. Checked 2026-10-14.
Quick start
Create an API key, store it in an environment variable, and send one small test request before wiring the model into your app.
Good and not so good
- Built for long agentic tasks
- Batch discount
- Highest Claude price
Use cases with Claude Fable 5.1
Personal & lifeHacker News · jmpman
Have an AI reverse engineer a device you own
Had the Fable model work out the music format of his self-playing piano system.
$10 in / $50 out per 1M tokensdaysAdvanced
MoneyX · @shmidtqq
Vet a memecoin with a council of agents before buying
Paste a token address and a council of agents led by Grok inspects it in real time before he buys.
$30/mo1 eveningAdvanced
Vibe coding & appsX · @SouranyPhomhome
Run a one-person game dev pipeline
Chain specialist tools: one model plans and codes, another handles 3D in Blender, Meshy makes extra assets, and Godot assembles the game.
$10 in / $50 out per 1M tokens1-2 hoursIntermediate