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Claude Fable 5.1

New
AnthropicAll Anthropic models

Input

$10.00

USD / 1M tokens

Output

$50.00

USD / 1M tokens

Context

1M

tokens

Released

2026-09-01

Positioning: Flagship. Price level 4 of 4 among text models. Vendor-stated speed: Slower.

Claude Fable 5.1 — long-form reasoning with the cheapest cache reads in the family. Claude Fable 5.1 is an Anthropic text model on ATP Token with a 1M-token context window, billed per 1M input and output tokens, with a lower cached-input rate.

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Pricing

Pay for what you use: credits are deducted only when a request succeeds.
Prices in USD · $1 = 100 credits
Input
$10.00
Cache read
$0.25
Output
$50.00
USD / 1M tokens
Cache write · 5m TTL$12.50 / 1M
Cache write · 1h TTL$20.00 / 1M

Anthropic · Family · USD / 1M tokens

Text models from the same vendor on ATP. Bars fill up to the family's highest price.
All Anthropic models
ModelInputOutput
Claude Fable 5claude-fable-5$10.00$50.00
Claude Fable 5.1 This pageclaude-fable-5-1$10.00$50.00
Claude Opus 4.6claude-opus-4-6$5.00$25.00
Claude Opus 4.7claude-opus-4-7$5.00$25.00
Claude Opus 4.8claude-opus-4-8$5.00$25.00
Claude Opus 5claude-opus-5$5.00$25.00
Claude Opus 5.5claude-opus-5-5$4.00$20.00
Claude Sonnet 4.6claude-sonnet-4-6$3.00$15.00
Claude Sonnet 5claude-sonnet-5$2.00$10.00
Claude Sonnet 5.5claude-sonnet-5-5$2.00$10.00
Claude Haiku 4.5claude-haiku-4-5$1.00$5.00
Claude Haiku 5.5claude-haiku-5-5$0.10$0.50

Cost per 1,000 typical requests

A quick estimate with fixed token counts per request. No caching, no retries. Try the estimator with your own numbers.
WorkloadUSD / 1,000
Short chat turn800 / 400$28.00
RAG answer4,000 / 500$65.00
Agent step with tools20,000 / 1,500$275.00

Same controls on every model: project keys, per-project model access, credit budgets, and a log of every request.Set up your organization

Cost estimator

Plug in your usage to see roughly what a month costs.
0200
0100
ESTIMATE
$200.00
USD / month
20,000 credits / month
  • Input$100.00
  • Output$100.00

$200.00 USD / month · 20,000 credits / month

An estimate at our USD prices (USD 1 = 100 credits). What each request actually cost shows up in your console's request log. Cached input is billed at the lower cache-read price, so you may spend less.

Quickstart

Keep your SDK. Point it at ATP and use a project key. Read the docs
quickstart.py · OpenAI SDK
from openai import OpenAI

client = OpenAI(
  base_url="https://api.atptoken.ai/v1",
  api_key="atp-•••"
)

r = client.chat.completions.create(
  model="claude-fable-5-1",
  messages=[{"role":"user","content":"hi"}],
)

Compare with similar models

Same type and positioning, from other vendors, closest in price first.
Compare side by side

Related models

All Anthropic models
Claude Fable 5claude-fable-5$10.00 / $50.00In / out · per 1M tokensClaude Opus 5claude-opus-5$5.00 / $25.00In / out · per 1M tokensClaude Opus 4.8claude-opus-4-8$5.00 / $25.00In / out · per 1M tokensClaude Opus 4.7claude-opus-4-7$5.00 / $25.00In / out · per 1M tokensClaude Opus 4.6claude-opus-4-6$5.00 / $25.00In / out · per 1M tokensClaude Opus 5.5claude-opus-5-5$4.00 / $20.00In / out · per 1M tokens

FAQ

4
Can Claude Fable 5.1 use tools, read images, or think before answering?
Claude Fable 5.1 supports tool calling, vision input and extended thinking, but not audio.
How much context does Claude Fable 5.1 take?
Anthropic lists a 1,000,000-token context window for Claude Fable 5.1. The model list your key can see shows the limit you actually get.
Is cached input cheaper on Claude Fable 5.1?
You pay per 1M input tokens and per 1M output tokens. Cached input costs 3% of the normal input price. Cache writes are priced separately. You only pay when a request succeeds. $1 = 100 credits. See pricing
Is there a newer Anthropic model than Claude Fable 5.1 on ATP?
Yes. Claude Haiku 5.5 (claude-haiku-5-5) came out on Oct 7, 2026, after Claude Fable 5.1 (Sep 1, 2026), and is the newer Anthropic text option on ATP. Both stay available: compare family prices on this page, then turn on the id you want for your project.
Get started

Start with $5. Credits never expire.

Create a project key, turn this model on, and pay only for what you use.

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