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.

Modèle de base Tous les modèles de cette base Tous les modèles du fournisseur vers le fournisseur

Entrée, $/1M $8.00

Sortie, $/1M $40.00

Lecture cache $0.20

Écriture cache —

Contexte 1 000 000

Sortie max. 128 000

Accepte fichiers, images, texte

Dernière vérification 14.11.2026 12:00:15 UTC

Source page du fournisseur

Alertes de prix

Connectez-vous pour suivre le prix

API

API compatible OpenAI : les SDK officiels d'OpenAI fonctionnent avec cette URL de base. Remplacez YOUR_API_KEY par votre clé du fournisseur.

URL de base de l'API	`https://go.fastrouter.ai/api/v1`
Point de terminaison	`https://go.fastrouter.ai/api/v1/chat/completions`
ID du modèle	`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());

Requête (JSON)

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

Réponse (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
  }
}

L'adresse provient de la liste de modèles du fournisseur ; vérifiez-la dans sa documentation.

Documentation API du fournisseur

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

Détails techniques

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