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Anthropic: Claude Fable 5.1

by Anthropic

Anthropic: Claude Fable 5.1 is a large language model from Anthropic. It costs $10.00 per million input tokens and $50.00 per million output tokens. Its context window is 1M tokens.

ReasoningTool callingStructured outputPrompt cachingBatch tierimage inputfile input
Input / 1M tokens
$10.00
Output / 1M tokens
$50.00
Cached input / 1M
$0.250

On repeated prefixes

Context window
1M

tokens

This model also charges $0.01 per search request

That is $10.00 per 1,000 requests, billed on top of the token prices above. On a typical 1,000-in / 500-out exchange the tokens cost $0.035, so the search fee is 29% on top. Per-token rankings elsewhere ignore this entirely.

Who serves it cheapest

4 hosts serve Claude Fable 5.1. Same weights, same API - the price difference is pure margin and routing.

Providers serving Anthropic: Claude Fable 5.1, cheapest first
ProviderInput / 1MOutput / 1MContextThroughputUptime 24h
AzureCheapest$10.00$50.001M-99.9%
Anthropic$10.00$50.001M-99.8%
Amazon Bedrock$10.00$50.001M--
Google$10.00$50.001M-99.8%

The spread between Azure and Google is about the same for identical weights. Quantization and context limits differ, so check both columns before switching.

Benchmarks

Independent scores published alongside the catalogue.

Intelligence index
53.4
Coding index
81.6
Agentic index
58.0

About Claude Fable 5.1

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...

Specifications

Anthropic: Claude Fable 5.1 specifications
Model IDanthropic/claude-fable-5.1
ProviderAnthropic
Context window1M tokens
Max output128K tokens
Input modalitiestext, image, file
Output modalitiestext
Knowledge cutoff-
Open weightsNo
ReleasedSeptember 1, 2026

Cheaper alternatives

Models that cost less than Claude Fable 5.1 while keeping at least half its context window and every input modality it supports.

Fugu Ultra v2

$5.00 in · $30.00 out

1.8× cheaper

GPT-5.5

$5.00 in · $30.00 out

1.8× cheaper

Claude Opus 5

$5.00 in · $25.00 out

2.0× cheaper

Claude Opus 4.8

$5.00 in · $25.00 out

2.0× cheaper

Claude Opus 4.7

$5.00 in · $25.00 out

2.0× cheaper

Frequently asked

How much does Anthropic: Claude Fable 5.1 cost?

$10.00 per million input tokens and $50.00 per million output tokens. Cached input reads cost $0.250 per million tokens.

What is the context window of Anthropic: Claude Fable 5.1?

1M tokens, with up to 128K tokens of output per request.

Does Anthropic: Claude Fable 5.1 have extra fees beyond per-token pricing?

Yes. Anthropic: Claude Fable 5.1 charges $0.01 per search request - $10.00 per 1,000 requests - on top of $10.00 per million input tokens and $50.00 per million output tokens. On a typical 1,000-input / 500-output exchange the search fee alone is 29% on top.

Which provider serves Anthropic: Claude Fable 5.1 cheapest?

Azure at $10.00 per million input tokens - about the same cheaper than Google, the most expensive of the 4 hosts serving it.

Confirm against the source: Anthropic official pricing.