Anthropic

Claude Fable 5

proprietaryReleased Jun 2026

Anthropic's first publicly available Mythos-class model, exceeding the capabilities of any model the company has previously made generally available. State-of-the-art on nearly all tested benchmarks, with exceptional performance in software engineering, knowledge work, vision, and scientific research. Its lead grows on longer and more complex tasks. Ships with built-in safeguards that route sensitive cybersecurity, biology, chemistry, and distillation queries to Claude Opus 4.8.

Capabilities

chatcompletionfunction-callingvisioncode-generationreasoning

Modalities

textimagecode

Context Window

300K tokens

Providers

available

Available from 1 provider

Cheapest

Anthropic

$90.00/1M tokens

Fastest

Anthropic

674ms TTFT

Anthropic

Providers (1)

Sorted by total cost (input + output per 1M tokens). Click a row to view provider details.

Provider	Pricing (per 1M)	Rate Limits	Regions	Health	Latency
Anthropic	In: $15.00Out: $75.00	50 RPM / 80K TPM	us-east-1eu-west-1	Healthy	674ms

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-5-20260609",
  messages: [
    { role: "user", content: "Hello!" }
  ],
});

console.log(response.choices[0].message.content);

Using Anthropic API • OpenAI-compatible SDK