Give it
- Long tasks that must keep their thread from start to finish.
- Large changes that cut across many modules.
- Deep investigations that read the same code and material again and again.
Model · Anthropic
Claude Fable 5.1Released September 1, 2026 · Available now
Save the longest, hardest tasks for Fable 5.1.
Anthropic's premium model for difficult, long-horizon work. In Agent.Space, pick an Agent and it is ready. No separate account needed.
Works with
In your space, pick an Agent, then pick the model.
SpecsOfficial page
- Context
- 1MToken
- Max output
- 128KToken
- Reasoning effort
- 5 levels
- Input
- Text · Image
Is it the one?
When to reach for Claude Fable 5.1
Matching the model to the task beats paying top price for everything.Skip it for
- Small everyday edits, where Sonnet 5.5 is better value.
- Bulk tasks with clear steps.
- Early exploration, before you know what you want: try a cheaper model first.
In Agent.Space
Pick it and go. The rest is handled.
No separate account
No Anthropic account, no API key to set up. What you use goes on your credits or your plan.
Set the reasoning effort
Low, Medium, High, Extra high, and Maximum. The default is High. Turn it up for hard problems, down for chores.
Agents and teammates, together
In one space, Agents can hand work to each other, and teammates can step in to see the results and carry on.
Pricing
Pay for what you use. See the price live.
1 credit = US$1. This is the official pay-as-you-go price right now. If your plan includes this model, plan allowance is used first.Model pricing
Per 1M tokens · USD
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FAQ
About Claude Fable 5.1
Probably not. It is a premium model built for long, hard tasks. Sonnet 5.5 is better value for daily changes; switch to Fable when the problem really calls for it.
Yes. Claude Fable 5.1 is available, and Claude Code, Grok Build, and OpenCode can run it. In your space, pick an Agent, then pick the model.
No. Usage goes straight onto your Agent.Space credits or plan.
By actual usage, deducted from credits at 1 credit = US$1. The live price is in the table on this page. If your plan includes the model, plan allowance is used first, and usage moves to credits once it runs out.
Right now
Get to work with Claude Fable 5.1.
Pick an Agent, choose the model, and leave the rest to your space.