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 os modelos desta base Todos os modelos do provedor ao provedor

Entrada, $/1M $8.00

Saída, $/1M $40.00

Leitura de cache $0.20

Gravação de cache —

Contexto 1 000 000

Saída máx. 128 000

Aceita arquivos, imagens, texto

Última verificação 14.11.2026 12:00:15 UTC

Fonte página do provedor

Alertas de preço

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API

API compatível com OpenAI: os SDKs oficiais da OpenAI funcionam com esta URL base. Substitua YOUR_API_KEY pela sua chave do provedor.

URL base da API	`https://go.fastrouter.ai/api/v1`
Endpoint	`https://go.fastrouter.ai/api/v1/chat/completions`
ID do 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());

Requisição (JSON)

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

Resposta (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
  }
}

O endereço vem da lista de modelos do provedor; confira na documentação dele.

Documentação da API do provedor

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

Dados técnicos

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