Claude Fable 5.1 Pricing
Anthropic · Released September 1, 2026. Fable 5.1 keeps adaptive thinking permanently on and
Save up to 70% on Claude Fable 5.1 API cost
Same model, same quality — pay less per token than the official API. Pay-as-you-go, no credit card required.
Other Anthropic Models
Claude Fable 5Claude Mythos 5Claude Opus 5Claude Sonnet 5Claude Opus 4.8Claude Sonnet 4.6Claude Haiku 4.5Claude Opus 4.7Claude 4 OpusClaude Sonnet 4Claude Fable 5.1 Pricing Context
Pricing position within Anthropic
Claude Fable 5.1 is the most expensive active model from Anthropic at $10.00/1M input — the premium tier. The cheapest sibling costs $1.00/1M (90% less). Reserve Claude Fable 5.1 for tasks where its capabilities justify the premium; route bulk traffic to cheaper siblings.
When Claude Fable 5.1 is worth the cost
Claude Fable 5.1 is used for agentic workflows combining visual understanding with action — document processing pipelines that extract data and call APIs, visual Q&A systems, and multimodal agents. Tool calling enables it to trigger external functions based on what it sees in images.
Cost vs sibling models
What makes Claude Fable 5.1 different from sibling models: compared to Claude Fable 5 ($0.00/1M cheaper, same 1M context); Claude Mythos 5 ($0.00/1M cheaper, same 1M context); Claude Opus 5 ($5.00/1M cheaper, same 1M context). Choose Claude Fable 5.1 when vision input is needed.
Real-world cost scenarios
Real-world deployments: document processing pipelines (read invoice → extract fields → call accounting API), visual Q&A systems, and multimodal agents that act on what they see. Claude Fable 5.1 handles the full see-decide-act loop in a single model call.