Anthropic's Fable AI brings the capabilities of its unreleased Mythos model to regular users
·2 min read
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Claude subscribers can try the model until June 22 without spending usage credits.
Key facts
Thereafter, using Fable 5 will cost usage credits, which Anthropic has priced at $10 per million input tokens and $50 per million output tokens
In the company's own testing, Fable beat not only its previous flagship offering, Opus 4.8, but also GPT-5.5 and Gemini 3.1 Pro from rivals OpenAI and Google
On Tuesday, Anthropic also released Mythos 5, which runs on the same underlying model as Fable 5 but comes with fewer safeguards
To release [Fable 5] both safely and quickly, they've tuned these safeguards conservatively, they'll sometimes catch harmless requests, though they trigger, on average, in less than 5 percent
Summary
Anthropic has announced Fable, the start of a new family of models that brings many of the capabilities of its Mythos system to the public. Glasswing also prompted the White House to rethink its policy on AI regulation. Anthropic says the new system, which starts at version five to align with the company's other models, offers capabilities that "exceed" those of any it has made publicly available in the past. In the company's own testing, Fable beat not only its previous flagship offering, Opus 4.8, but also GPT-5.5 and Gemini 3.1 Pro from rivals OpenAI and Google. You may recall last year Anthropic streamed Claude trying (and failing) to beat Pokémon Red. The model Anthropic used for that Twitch series, 3.7 Sonnet, required an overlay to allow Claude to make sense of the game's pixel art interface and world.