What is Fable 5?

Fable 5 is an AI model referenced in comparisons of performance and cost.

• Jun 2026 - Nathaniel Whittemore said GLM 5.2 beats Fable 5 on reasoning at 1/10 the cost and 300 tokens per second.
• Jun 2026 - Matt Palmer said he cannot use Fable 5 outside incognito mode because it recognizes him as a biomedical researcher.