Call Claude Fable 5.1 on ModelFold with model id claude-fable-5-1. The same id works for the web playground, POST /v1/chat/completions, and the Claude Messages API.

What this model is for

Context window

1,000,000 tokens of context and up to 128,000 tokens of output, for long conversations, documents, and code.

Text, images, and files

Text in and text out. Image and file inputs are accepted on the same model id.

Tools and thinking

Native Messages requests can stream, call tools, and return thinking. An unknown model id is rejected and is not replaced with another model.

Pricing

Billing follows token usage. At current prices, input is 960 credits per 1M tokens (about $4.8) and output is 4800 credits per 1M tokens (about $24). Final charges follow actual token usage. Failed calls are not charged.

Real responses

These two replies were returned by claude-fable-5-1 on 2026-11-12. Prompt: In one sentence, why do library call numbers exist? Reply: Library call numbers exist to give each item a unique address that both groups it on the shelf with related materials and lets anyone locate it quickly and consistently. Prompt: Name two ingredients in a basic vinaigrette, separated by a comma. Reply: Oil, vinegar

FAQ

What model id do I send?⌄

Send model claude-fable-5-1 to POST https://modelfold.ai/v1/chat/completions with Authorization: Bearer YOUR_API_KEY. stream: true returns server-sent events. Claude Code uses the same id on POST https://modelfold.ai/anthropic/v1/messages.

Does it support tools?⌄

Yes. A Messages request with an add tool asked the model to add 23 and 13. It called add with a=23 and b=13 and did not answer with the sum itself.

料金表

入力	960 クレジット 1M tokens≈ $4.80
出力	4800 クレジット 1M tokens≈ $24.00

トークン単位で課金し、入力と出力は別料金です。思考トークンは出力に含まれます。Playground でも同じ計算を使います。

API ドキュメントを見る →AI Agents · Claude Code / Cursor / Trae →

クイックスタート

POST/v1/chat/completions

curl https://modelfold.ai/v1/chat/completions \
  -H "Authorization: Bearer $MODELFOLD_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-fable-5-1","messages":[{"role":"user","content":"Hello"}]}'