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Claude Fable 5.1

A premium Claude model for long, multi-step jobs and knowledge work. It costs 2.5 times as much as Claude Opus 5.5.

Last updated October 16, 2026.

Costs here use the prices AI companies charge software developers, so they show relative cost, not your monthly bill. See what ChatGPT, Claude and Gemini charge you.

Made by Anthropic, the company behind Claude. Most capable.

What it costs

1,000-word essay: $0.07 (about 7 cents)
100 chat messages: $13.12
50-page PDF summary: $0.37 (about 37 cents)

Based on list prices and the assumptions on How we work. Your real cost will differ.

At a glance

Smartness: ★★★★★ (5 of 5) (our banding of the Artificial Analysis score, where available)
Reads at once: about 1,500 pages (rule of thumb)
Understands: text, pictures, files
Free to download and run yourself: No
Free to use: Not free for developers. Free app plans

App plans and prices for Claude: see plans.

Best for

long multi-step jobsknowledge work

Watch out for

Test whether the extra cost is worth it for your task before relying on it.

Frequently asked

How much does Claude Fable 5.1 cost to use?
A 1,000-word essay costs about $0.07 (about 7 cents); summarizing a 50-page PDF about $0.37 (about 37 cents). These are developer (API) prices, not an app subscription.

What is Claude Fable 5.1 best for?
A premium Claude model for long, multi-step jobs and knowledge work. It costs 2.5 times as much as Claude Opus 5.5.

How much can Claude Fable 5.1 read at once?
About 1,500 pages (a rule of thumb: 1,000,000 tokens at roughly 500 words a page).

Can I download Claude Fable 5.1 for free?
No. It is only available through the maker or other paid services.

Under the hood

Maker	Anthropic
Price per 1M input tokens	$10.00
Price per 1M output tokens	$50.00
Context size	1M tokens (1,000,000)
Artificial Analysis Intelligence Index	53.4 (source, via OpenRouter)
Open weights	No
Speed	Not measured yet
Listed	2026-09-01

Maker's description (technical)

Claude Fable 5.1 improves on Claude Fable 5 across the board, with the biggest gains in agentic coding, long-running agentic workflows, and knowledge work: long code refactors, front-end and visual...

View on OpenRouter. Our verdict above is editorial, not benchmarked by us.