Anthropic · Frontier profile
Claude Fable 5.1
Anthropic’s demanding-work pick for reasoning and long-running agents.
Compare all threeConsider it for
Long-running agents
Anthropic positions this model for demanding reasoning and long-horizon agentic work. Adjustable effort lets you test the tradeoff between depth, time and token use.
The tradeoff
A larger context budget does not establish better recall or answer quality. Audio/video workflows need conversion unless documented separately by the provider.
Task guidance follows the documented capabilities. It is not an independent benchmark result.
At a glance
- Inputs
- Text, images, PDF
- Context budget
- 1,000,000 tokens
- Maximum output
- 128,000 tokens
- Reasoning
- low, medium, high, xhigh, max; default high; Adaptive (always on)
- API access
- Claude API; cloud-platform availability and prices can differ
Standard API pricing
$10 input / $50 output
USD per million tokens · Sources checked Nov 4, 2026, 2:24 AM UTC
Standard Claude API token rates. Caching, batch processing, tools and cloud-platform rates are separate. Rates follow the published schedule. Chat subscription prices are separate.
How does it compare?
Check the evidence
Provider documentation, verified Nov 4, 2026, 2:24 AM UTC.
Automatically checked against official sources
Claude Fable 5.1 ·
Official sources checked automatically every two hours.
Task guidance follows documented capabilities. No cross-lab performance ranking. API limits and prices differ from chat subscriptions. Open a profile for the official sources and pricing conditions.