Which Claude model should you use?

Picking the cheapest Claude model at the lowest effort looks like the obvious way to save money. With Claude Fable 5.1, a more intelligent model can cost less to complete a task. Learn what decides the cost of a task, and which model and effort to pick for open-ended and for routine work, whether you’re choosing for yourself or setting the defaults for your organization.

Claude Fable 5.1 announcement: https://www.anthropic.com/claude-fable-and-mythos-5-1
Claude Fable 5.1 on Claude Enterprise: https://support.claude.com/en/articles/16764779-claude-fable-5-1-on-claude-enterprise-access-frontier-intelligence-at-reduced-cost
Manage model access for your organization: https://support.claude.com/en/articles/15694740-manage-model-access-for-your-organization
Set a default model for your organization: https://support.claude.com/en/articles/15330088
Optimizing for cost and intelligence: https://platform.claude.com/docs/en/about-claude/models/optimizing-for-cost-and-intelligence