Claude Fable 5.1 API

Claude Fable 5.1 pricing

−82% vs the official API price of $10.00 input / $50.00 output per 1M tokens (source, checked 2026-10-13).

Input

$1.794

Cached input

$0.04484

Cache write

$2.242

Output

$8.969

Typical message

≈ 0.63¢

USD per 1 million tokens. A typical message is about 1,000 input and 500 output tokens. Cached input uses the cache-read rate when the provider reports a cache hit. Billed from your prepaid balance.

API compatibility and context

Exact model ID

claude-fable-5-1 Copy

Provider

Anthropic

Variant

Standard

Supported API

Anthropic-compatible Messages API (/v1/messages)

Availability

Preview

Context window

1,000,000 tokens

Maximum input

Not published

Maximum output

128,000 tokens

Use Claude Fable 5.1 through the API

Create a RouterHub account, add prepaid credits and create an API key. Set ROUTERHUB_API_KEY locally, then send a first request with the exact model ID.

curl --connect-timeout 30 --max-time 600 https://routerhub.si/v1/messages \
  -H "x-api-key: $ROUTERHUB_API_KEY" \
  -H "anthropic-version: 2023-06-01" \
  -H "Content-Type: application/json" \
  -d '{"model":"claude-fable-5-1","max_tokens":256,"messages":[{"role":"user","content":"Write a short noir scene set in a lighthouse."}]}'

Python: install anthropic with pip. The example requests 256 output tokens and disables automatic retries, so check Usage before resending a paid request.

import os
from anthropic import Anthropic

client = Anthropic(
    api_key=os.environ["ROUTERHUB_API_KEY"],
    base_url="https://routerhub.si",
    timeout=600.0,
    max_retries=0,
)
response = client.messages.create(
    model="claude-fable-5-1",
    max_tokens=256,
    messages=[{"role": "user", "content": "Write a short noir scene set in a lighthouse."}],
)
print(response.content)

Coding tools that work with Claude Fable 5.1

• OpenCodeSet up OpenCode with claude-fable-5-1.
• Claude CodeSet up Claude Code with claude-fable-5-1.
• VS Code + ContinueSet up VS Code + Continue with claude-fable-5-1.
• VS Code + ClineIf the model is in Cline's Anthropic model picker.
• Claude DesktopSet up Claude Desktop with claude-fable-5-1.
• cURL / PythonSet up cURL / Python with claude-fable-5-1.

Common questions

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