Anthropic
Claude Fable 5.1
Anthropic's most capable widely released model for the hardest reasoning and long-horizon agent work.
USD per 1M output tokens
$50.00
- input
- $10.00
- output
- $50.00
#24 cheapest of 25 in Large language models
Official pricing ↗Capabilities, explained
What this API can do, and what each capability means for your project.
Input price
$10
Cost of the text, images and files you send to the model.
Context window
1,000K tokens
How much text the model can read at once. 200K tokens ≈ a 500-page book.
Max output
128K tokens
Longest single response the model can write.
Input types
text, image, pdf
What kinds of input the model understands besides text.
Tool use / function calling
Yes
The model can request calls to your functions/APIs with structured arguments, the basis of agents.
Guaranteed JSON output
Yes
The API can force the response to match a JSON schema you provide.
Extended reasoning
Yes
The model can 'think' step by step before answering, improving hard math/coding at extra cost and latency.
Open weights
No
The model weights are downloadable, so you can self-host it or switch hosting providers without changing models.
Typical latency
—
How long until the first useful output arrives. Lower is better for interactive apps; batch jobs rarely care.
Price history
Only one price recorded so far. The chart appears once the price changes.