Anthropic: Claude Fable 5.1 — pricing & benchmarks

By anthropic · Updated 2026-10-06 · Reads imageslong-context / RAGreads images / documentsstep-by-step reasoning

What Anthropic: Claude Fable 5.1 is used for

Anthropic: Claude Fable 5.1 is best suited for long-context / RAG, reads images / documents, step-by-step reasoning. Access it through one Appmo API key alongside 458 other models — Appmo's optimizer can route to it automatically when it is the best value for a request.

What people are saying (last 30 days)

Not enough posts yet to judge community sentiment. 14 Hacker News stories (42 points) · 87 new GitHub repos mentioning it. How we measure this.

• Claude Fable 5.1 cracked a cipher that has survived for 370 years in 40 min. — Hacker News, 8 pts, 2 comments
• GPT-6 Astra is better at making money, more ethical than Claude Fable 5.1 — Hacker News, 5 pts, 0 comments
• What We Can Learn from Claude's Fable 5.1 System Prompt Changes — Hacker News, 5 pts, 0 comments

Use it via the Appmo API (OpenAI-compatible)

curl https://appmo.com/v1/chat/completions \
  -H "Authorization: Bearer $APPMO_KEY" \
  -d '{"model":"anthropic/claude-fable-5.1","messages":[{"role":"user","content":"Hello"}]}'

FAQ

How much does Anthropic: Claude Fable 5.1 cost?
Anthropic: Claude Fable 5.1 costs $10 per 1M input tokens and $50 per 1M output tokens ($20 blended), as of 2026-10-06. Prices are expected to fall as competition increases.

What is Anthropic: Claude Fable 5.1 best for?
Anthropic: Claude Fable 5.1 is best suited for long-context / RAG, reads images / documents, step-by-step reasoning.

How do I use Anthropic: Claude Fable 5.1?
Send requests to Appmo's OpenAI-compatible endpoint with model id "anthropic/claude-fable-5.1" and one API key — no separate provider account needed.

Is Anthropic: Claude Fable 5.1 open source?
We have no record of public weights for Anthropic: Claude Fable 5.1; treat it as a closed model available only through its provider's API.

Can Anthropic: Claude Fable 5.1 create images?
No. Anthropic: Claude Fable 5.1 can read and understand images, but it only writes text.