Long context

claude-fable-5.1 API pricing

Anthropic's Claude series — long context, dependable tool calling, and the native models behind Claude Code.

Model IDanthropic/claude-fable-5.1

Get API Key Run your first request

Call summary

Input

$10.00$8.00/ 1M tokens

Cache write $10.00

Output

$50.00$40.00/ 1M tokens

Cache read $0.80

Context Window

1.05M

API Endpoints

Available Configurations

claude-fable-5.1 API endpoints

One API key — call this model through any of the 2 endpoints below.

POST/v1/chat/completionsOpenAI-compatible · Works for every model

Docs

POST/v1/messagesAnthropic-native · Native for Claude Code

Docs

Production reliability

Privacy-safe aggregates from real Router One model calls, so you can assess stability and response latency before integrating.

Not enough production samples yet

This window needs at least 100 eligible requests across 5 independent principals. Metrics appear automatically after that threshold is met.

More Claude models on Router One

10 other Claude models on the same gateway and API key — each page lists endpoints, posted price, and context window.

Call claude-fable-5.1 from your code

The same API key works across all 2 endpoints below.

Endpoint

/v1/chat/completions

Model ID

anthropic/claude-fable-5.1

Routing mode

auto

Request example

bash

curl -X POST \
  https://api.router.one/v1/chat/completions \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -d '{
    "model": "anthropic/claude-fable-5.1",
    "messages": [
      {"role": "user", "content": "Hello!"}
    ]
  }'

Get API Key

claude-fable-5.1 at a glance

claude-fable-5.1 is a Claude-series text model on Router One. Posted rate: $8.00 in / $40.00 out per 1M tokens (was $10.00 in / $50.00 out). Context window: 1.05M tokens. Accepts text, image; returns text. Endpoints: POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path).

claude-fable-5.1 FAQ

How much does claude-fable-5.1 cost on Router One?

claude-fable-5.1 is billed per token on Router One: $8.00 in / $40.00 out per 1M tokens, pay as you go.

Which endpoints serve claude-fable-5.1?

claude-fable-5.1 is served on 2 endpoints — POST /v1/chat/completions (OpenAI-compatible), POST /v1/messages (Anthropic-native, the Claude Code path). The same Router One API key works on each.

What is claude-fable-5.1's context window?

claude-fable-5.1 accepts up to 1.05M tokens of context per request on Router One.

Start using claude-fable-5.1

Create an API key and call claude-fable-5.1 at $8.00 in / $40.00 out per 1M tokens on Router One — pay as you go, with per-request cost and latency visibility.

Get API Key Plans & pay-as-you-go pricing Compare models side by side Quickstart guide