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Claude Fable 5.1 pricing and routing profile

Claude Fable 5.1 from Anthropic lists at $10.00 per million input tokens and $50.00 per million output tokens, with a 1,000,000-token context window. Prices from OpenRouter's catalogue on 2026-09-28.

Input, per 1M tokens$10.00

Output, per 1M tokens$50.00

Cached input, per 1M$0.25

Context window1M

Confidence signalNot exposed

Tool callingStructured outputReasoning control

Cost per 1,000 requests

Request shape	List cost
Classification or routing (600 tokens in, 10 out)	$6.50
Chat reply (2,000 in, 400 out)	$40.00
Retrieval-augmented answer (8,000 in, 500 out)	$105

Before prompt caching. Try your own shape in the cost calculator.

Can Gimbix route to it first?

Not as a first-answer model through OpenRouter: no host returns token log probabilities for Claude Fable 5.1. It can still be the model Gimbix falls back to when a cheaper model is unsure.

Who serves Claude Fable 5.1

Host	Input / output per 1M	Log probabilities	Uptime, last 30 min
Azure	$10.00 / $50.00	no	—
Anthropic	$10.00 / $50.00	no	99.9%
Amazon Bedrock	$10.00 / $50.00	no	—
Google	$10.00 / $50.00	no	99.6%

A host that lists log probabilities may still omit them; Gimbix checks each one before relying on it.

Cheaper models that can answer first

Models priced below Claude Fable 5.1 that expose a confidence signal. Whether they answer your traffic as well is what a Gimbix pilot measures.

Model	Input / output per 1M	Cheaper on a chat reply
GPT-5.4 Image 2	$8.00 / $15.00	45%
GPT-4o (2024-05-13)	$5.00 / $15.00	60%
Qwen3.8 Max Prime	$4.00 / $12.00	68%
Ember-1	$3.00 / $15.00	70%
Kimi K3	$3.00 / $15.00	70%
GLM 5.3 Prime	$2.80 / $8.80	77%

Compare Claude Fable 5.1

Questions

How much does Claude Fable 5.1 cost?

Claude Fable 5.1 lists at $10.00 per million input tokens and $50.00 per million output tokens on OpenRouter as of 2026-09-28. A typical chat reply of 2,000 input and 400 output tokens costs about $40.00 per 1,000 requests.

What is the context window of Claude Fable 5.1?

1,000,000 tokens.

Can a cheaper model replace Claude Fable 5.1?

Sometimes. Gimbix proves it on your own traffic before routing: the cheaper model must match Claude Fable 5.1 on one half of your requests and make at most three answers worse on the other.