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Claude Fable 5.1

by Anthropic
anthropic/claude-fable-5-1
30% off

Claude Fable 5.1 is a text and image-input model by Anthropic, available through the AgentSky API as anthropic/claude-fable-5-1 at $7.00 per million input tokens and $35.00 per million output tokens, with a 1M context window.

The latest Mythos-class model for demanding reasoning and long-horizon agentic work, with always-on adaptive thinking and cache reads at a quarter of Fable 5's price.

Repo

Run Claude Fable 5.1 with an agent

Each guide pairs this model with a compatible agent and opens the composer with both selected.

Pricing

USD per million tokens, using your plan when signed in.
MeterPer 1M tokens
InputOfficial price: $10.00Sale price: $7.00
OutputOfficial price: $50.00Sale price: $35.00
Cache readOfficial price: $0.25Sale price: $0.175
Cache writeOfficial price: $12.50Sale price: $8.75

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-5-1",
  max_tokens: 256,
  messages: [{ role: "user", content: "Summarise this ticket." }],
});
console.log(message.usage.cost); // USD, in the response

Questions