Claude Fable 5.1

Every story about Claude Fable 5.1 (1)

New modelsSamaya Sterling a tiny AI finance agent beats a bigger one at a fraction of the costHerald of AI▶

New models

Samaya Sterling a tiny AI finance agent beats a bigger one at a fraction of the cost

A small post-trained model does financial research better than a large frontier model, for 11 times less money.

Oct 31, 2026 · 4 min read

Also mentioned in (2)

Stories about something else that name Claude Fable 5.1 in passing, with the sentence that does.

• Kimi K3.1 Pro, a Chinese AI model anyone will be able to download, nearly matches Claude Opus 5.5“On the Artificial Analysis leaderboard, the model earned a rating of 55, placing it above Claude Fable 5.1, GPT-6 Astra, and Gemini 4 Argon, which each scored 53, and just below Claude Opus 5.5, which was ranked at 58.”
• Simon Willison Updates llm-gemini to Support New Gemini 4 Argon Model“That makes it half the price of Claude Opus 5.5 and one-fifth the cost of Claude Fable 5.1, GPT-6 Astra and GPT-6 Sol.”