Use Fable 5 with Cursor: what works today

Quick summary

• Check Cursor's model settings first: Cursor typically adds new frontier models on its own schedule.
• Cursor supports custom Anthropic API keys, so claude-fable-5 can run at API rates if exposed in your version.
• Claude Code runs in Cursor's integrated terminal exactly as in any terminal, using your Claude plan.

Step 1: check Cursor's model list

Open Cursor's settings and look at the models section. Cursor decides when to add new models to its native list and how to price them inside its own plans, so availability can lag a launch by days and differs between plan tiers. If Fable 5 appears there, that is the simplest route and billing stays inside your Cursor subscription.

Step 2: use your own Anthropic API key

Cursor's settings allow a custom Anthropic API key. With your key active, requests bill to your Anthropic account at API rates: $10 per million input tokens and $50 per million output tokens for claude-fable-5. Note that enabling a custom key in Cursor changes how some Cursor features behave, so read Cursor's current documentation on custom keys before switching.

Step 3: the fallback that always works

Cursor ships a full integrated terminal, and Claude Code runs in it like in any terminal. With a Claude Pro or Max plan, that gives you Fable 5 inside your Cursor workspace today, included in plan limits until June 22. You keep Cursor's editor experience and add Anthropic's own agentic tool alongside Cursor's features rather than replacing them.

Cost comparison across the three routes

Native Cursor models bill through Cursor's plan and request pricing. A custom API key bills per token with full transparency but no Cursor subsidy. Claude Code with a subscription is effectively pre-paid until June 22, then follows whatever you decide about usage credits. If your goal is evaluating Fable 5 honestly before committing money, the terminal route with an existing Claude plan is the cheapest controlled test.