Claude Fable 5.1 · abacus

Claude Fable 5.1 from Anthropic is the next-generation Claude model, delivering major advances in coding, reasoning, and agentic tasks. It excels in tasks requiring long, complex reasoning chains, but is also expensive.

Base model All models on this base All models of the provider to the provider

Input, $/1M $10.00

Output, $/1M $50.00

Cache read $0.25

Cache write —

Context 1 000 000

Max output 128 000

Accepts images, text

Last checked 04.11.2026 12:00:14 UTC

Source provider's page

Price alerts

API

OpenAI-compatible API: the official OpenAI SDKs work with this base URL. Replace YOUR_API_KEY with your key from the provider.

API base URL	`https://routellm.abacus.ai/v1`
Endpoint	`https://routellm.abacus.ai/v1/chat/completions`
Model id	`claude-fable-5-1`

curl

curl https://routellm.abacus.ai/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "claude-fable-5-1", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'

Python

import requests

r = requests.post(
    "https://routellm.abacus.ai/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "claude-fable-5-1",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())

JavaScript

const r = await fetch("https://routellm.abacus.ai/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "claude-fable-5-1",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());

Request (JSON)

{
  "model": "claude-fable-5-1",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}

Response (JSON)

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "claude-fable-5-1",
  "choices": [
    {
      "index": 0,
      "message": {
        "role": "assistant",
        "content": "Hi! How can I help?"
      },
      "finish_reason": "stop"
    }
  ],
  "usage": {
    "prompt_tokens": 9,
    "completion_tokens": 12,
    "total_tokens": 21
  }
}

The address is taken from the provider's model list; check it against the provider's documentation.

Provider's API documentation

Source: AI Rate Card, https://airatecard.com/en/c/offer%3Aabacus%7Cclaude-fable-5-1, prices checked 2026-11-04; seller's page: https://abacus.ai

Technical details

ID: offer:abacus|claude-fable-5-1