Anthropic: Claude Fable 5.2 · fastrouter

Claude Fable 5.2 is Anthropic's generally available, production-safeguarded model for demanding reasoning and long-horizon agentic work, sharing underlying weights with Claude Mythos 5.2. Typical uses include agent sessions that run for hours, multistep deep research, and analysis carried through to a finished document, spreadsheet, or deck. It accepts text, images, and files and returns text, with a 1M-token context window and up to 128K output tokens. Adaptive thinking is always on, with the effort parameter controlling reasoning depth (low, medium, high, xhigh, max; default: high). Forced tool use returns an error, and temperature, top_p, and top_k should be omitted. It is priced 20% below Claude Fable 5.1 and offers an optional fast mode with up to 2.5x faster output at 2x the standard price.

Modelo base Todos los modelos de esta base Todos los modelos del proveedor al proveedor

Entrada, $/1M $8.00

Salida, $/1M $40.00

Lectura de caché $0.20

Escritura de caché —

Contexto 1 000 000

Salida máx. 128 000

Acepta archivos, imágenes, texto

Última comprobación 14.11.2026 12:00:15 UTC

Fuente página del proveedor

Alertas de precio

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API

API compatible con OpenAI: los SDK oficiales de OpenAI funcionan con esta URL base. Sustituye YOUR_API_KEY por tu clave del proveedor.

URL base de la API	`https://go.fastrouter.ai/api/v1`
Endpoint	`https://go.fastrouter.ai/api/v1/chat/completions`
ID del modelo	`anthropic/claude-fable-5.2`

curl

curl https://go.fastrouter.ai/api/v1/chat/completions \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "anthropic/claude-fable-5.2", "messages": [{"role": "user", "content": "Hello!"}], "max_tokens": 256}'

Python

import requests

r = requests.post(
    "https://go.fastrouter.ai/api/v1/chat/completions",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    json={
      "model": "anthropic/claude-fable-5.2",
      "messages": [
        {
          "role": "user",
          "content": "Hello!"
        }
      ],
      "max_tokens": 256
    },
)
print(r.json())

JavaScript

const r = await fetch("https://go.fastrouter.ai/api/v1/chat/completions", {
  method: "POST",
  headers: {Authorization: "Bearer YOUR_API_KEY", "Content-Type": "application/json"},
  body: JSON.stringify({
    "model": "anthropic/claude-fable-5.2",
    "messages": [
      {
        "role": "user",
        "content": "Hello!"
      }
    ],
    "max_tokens": 256
  }),
});
console.log(await r.json());

Solicitud (JSON)

{
  "model": "anthropic/claude-fable-5.2",
  "messages": [
    {
      "role": "user",
      "content": "Hello!"
    }
  ],
  "max_tokens": 256
}

Respuesta (JSON)

{
  "id": "chatcmpl-...",
  "object": "chat.completion",
  "model": "anthropic/claude-fable-5.2",
  "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
  }
}

La dirección se toma de la lista de modelos del proveedor; compruébala con su documentación.

Documentación de la API del proveedor

Source: AI Rate Card, https://airatecard.com/es/c/offer%3Afastrouter%7Canthropic/claude-fable-5.2, prices checked 2026-11-14; seller's page: https://fastrouter.ai

Datos técnicos

ID: offer:fastrouter|anthropic/claude-fable-5.2