Claude Fable 5 API 2026: Anthropic's New Flagship Model, Pricing, and CodeFast Claude Max API
Anthropic announced Claude Fable 5 on June 9, 2026: the strongest generally available Mythos-class model with 1M context, adaptive thinking, and $10/$50 MTok pricing. This guide compares Fable 5 software engineering, vision, safety classifiers, and official costs with CodeFast Claude Max API's $0.15 per 1M token package approach.
Anthropic announced Claude Fable 5 on June 9, 2026. It is positioned as a Mythos-class model made safe for general use. Developers can use it on the Claude API with the `claude-fable-5` model ID. It targets 1M context, 128K max output, adaptive thinking (always on), and a clear lead over previous Claude models on long-running autonomous tasks.
The main message is clear: Fable 5 is the most capable model Anthropic has ever made generally available. It targets state-of-the-art performance in software engineering, knowledge work, vision, scientific research, and long-running agent tasks. The longer and more complex the task, the larger Fable 5's lead over previous models.
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