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Anthropic
Claude Fable 5.1
proprietaryReleased Sep 1, 2026
Anthropic's latest generally available Fable model for demanding reasoning, long-horizon agentic work, ambitious coding projects, multistep research, and document-heavy analysis. It extends Claude Fable 5 with stronger agentic coding and knowledge work, adaptive thinking, more precise safeguards, content provenance, lower cache-read pricing, and 1M-token context support.
ChatText completionFunction callingVisionCode generationReasoningtext · image · code
Provider (1)
Sorted by total cost (input + output per 1M tokens). Select a row to view provider details.
| Provider | Pricing (per 1M) | Rate limits | Regions | Health | Latency |
|---|---|---|---|---|---|
| In: $10.00Out: $50.00 | 50 RPM / 80K TPM | us-east-1eu-west-1 | Healthy | 0ms |
Quick start
Use this model via Anthropic with an OpenAI-compatible SDK.
import OpenAI from "openai";
const client = new OpenAI({
baseURL: "https://api.anthropic.com/v1",
apiKey: process.env.ANTHROPIC_API_KEY,
});
const response = await client.chat.completions.create({
model: "claude-fable-5-1",
messages: [
{ role: "user", content: "Hello!" }
],
});
console.log(response.choices[0].message.content);Using Anthropic API · OpenAI-compatible SDK