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Claude Fable 5.2

by Anthropic
anthropic/claude-fable-5-2

Claude Fable 5.2 is a text and image and file-input model by Anthropic, available through the AgentSky API as anthropic/claude-fable-5-2 at $8.00 per million input tokens and $40.00 per million output tokens, with a 1M context window.

Claude Fable 5.2 is Anthropic's most capable model for the most demanding technical work, with gains over Fable 5.1 in coding, reasoning, and vision.

  1. Get an API key

  2. Send a request

    curl https://gateway.agentsky.dev/v1/messages \
  -H "authorization: Bearer $AGENTSKY_API_KEY" \
  -H "content-type: application/json" \
  -H "anthropic-version: 2023-06-01" \
  -d '{"model":"anthropic/claude-fable-5-2","max_tokens":128,"messages":[{"role":"user","content":"In one sentence, what can you help me with?"}]}'

  3. Run it here, no terminal needed

    Billed to your balance: under $0.01.

  4. Or hand it to your agent

    Use Claude Fable 5.2 through AgentSky.
Model id: anthropic/claude-fable-5-2
OpenAI-compatible base URL: https://gateway.agentsky.dev/v1 · Anthropic base URL: https://gateway.agentsky.dev
Docs: https://agentsky.dev/models/anthropic/claude-fable-5-2.md
Key: <your AgentSky API key>
SDK samples API docs

This model is available through the API. It is not currently offered as an agent’s reasoning model.

Pricing

USD per million tokens, using your plan when signed in.
MeterPer 1M tokens
InputPrice: $8.00
OutputPrice: $40.00
Cache readPrice: $0.2
Cache writePrice: $10.00

Every response carries its own cost. Balance and per-call records: /v1/credits and /v1/generation.

Use it

Point your client at the gateway and pass this model id. Nothing else changes.
import Anthropic from "@anthropic-ai/sdk";

const client = new Anthropic({
  baseURL: "https://gateway.agentsky.dev",
  apiKey: process.env.AGENTSKY_API_KEY, // ast_…
});

const message = await client.messages.create({
  model: "anthropic/claude-fable-5-2",
  max_tokens: 256,
  messages: [{ role: "user", content: "Summarise this ticket." }],
});
console.log(message.usage.cost); // USD, in the response

Questions