Claude Fable 5.1
AvailableAn Anthropic model with a 1M-token context window, image input and tool calling. On the Anthropic API since September 1, 2026.
Access details: Anthropic API
The model ID to use in API requests.
claude-fable-5-1Updated Sep 23, 2026
Capabilities & limits
- Context window
- 1M
- Maximum output
- 128K
- Image input
- Supported
- Tool calling
- Supported
- Structured output
- Supported
Pricing
USD / 1M tokens- Input
- $10.00
- Output
- $50.00
Standard rates per million tokens. Discounts and long-context rates, where offered, are on Anthropic's pricing page.
Full rate card 5 rates
All prices in USD.
Base input tokens
$10.00 per 1M tokens- Claude API global standard
Output tokens
$50.00 per 1M tokens- Claude API global standard
Cache hits and refreshes
$0.25 per 1M tokens- prompt caching
5 minute cache writes
$12.50 per 1M tokens- prompt caching
- 5 minute duration
1 hour cache writes
$20.00 per 1M tokens- prompt caching
- 1 hour duration
Full 1M-token context window uses standard pricing, including requests over 200K input tokens; prompt caching and Batch discounts remain at standard rates.
Price history
Sep 13, 2026
Input $10.00 per million tokens
Oct 20, 2026
Input $10.00 per million tokens
Sep 13, 2026
Output $50.00 per million tokens
Oct 20, 2026
Output $50.00 per million tokens
Technical details
- Parameters
- Not published
- Active parameters
- Not published
- Architecture
- Not published
- Training / knowledge cutoff
- Jun 2026
- Input modalities
- Text, image
- Output modalities
- Text
From Anthropic
Official announcement ↗How they describe it
For demanding reasoning and long-horizon agentic work
What they say is new
Our most advanced models for coding and knowledge work
Release & lifecycle
- First available
- Sep 1, 2026
- available
- As of Sep 13, 2026
- available
- As of Oct 20, 2026